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BBC Head Casting Numbers
Click Header to Sort
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Casting Number
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Year
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Port Type
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Chamber Type
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C.I.D.
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Chamber Size
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Notes
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330864
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68-84
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oval
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OPEN
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396, 402, 366T, 427T, 454
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�Truck
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330865
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68-84
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oval
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OPEN
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396, 402, 366T, 427T, 454
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�Truck
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330866
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68-78
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oval
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OPEN
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366T, 427T
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330867
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68-73
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oval
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OPEN
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427T
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336765
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68-78
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oval
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OPEN
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427T
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336768
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73-76
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oval
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OPEN
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427T
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336781
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73-85
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oval
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OPEN
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454
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118cc
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�256/114cc ports
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343771
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68-86
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oval
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OPEN
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366T, 427T, 454
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343772
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68-86
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oval
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OPEN
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366T, 427T, 454
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343783
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70-76
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oval
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OPEN
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454
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Truck
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346236
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75-87
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oval
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OPEN
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454
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120cc
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�225/116cc ports
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352625
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70-76
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oval
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OPEN
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454
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Truck
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353049
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73-84
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oval
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OPEN
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454
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122cc
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�255/119cc ports
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366765
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74-78
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oval
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OPEN
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427T
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473328
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68-69
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oval
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OPEN
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366T
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3856206
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65-66
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oval
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CLOSED
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396
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37cc
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3856208
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65
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rect
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CLOSED
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396/425hp, 396/375hp
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109cc
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"Z-16" Chevelle
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3856213
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66-82
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oval
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CLOSED
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366T, 427T
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3856260
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68
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oval
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CLOSED
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396
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�Truck
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3872702
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65-66
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oval
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CLOSED
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396, 427
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98cc
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3873858
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65-67
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rect
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CLOSED
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396, 427
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109cc
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3876875
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77-85
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oval
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OPEN
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427T
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3904390
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67
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oval
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CLOSED
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396, 427
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98cc
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3904391
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67
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rect
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CLOSED
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396, 427
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107cc
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3904392
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67
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rect
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CLOSED
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427
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107cc
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�Aluminum L88 L98
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3904393
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68-76
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oval
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OPEN
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366T
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3908952
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67
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oval
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OPEN
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427
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�"M.Truck"
Marine
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3909802
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67
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oval
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CLOSED
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396, 427
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101cc
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3917215
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67-68
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oval
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CLOSED
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396, 427
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101cc
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3917219
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68-85
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oval
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OPEN
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366T, 427T
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3919840
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67-69
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rect
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CLOSED
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396, 427
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107cc
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3919842
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68-69
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rect
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CLOSED
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396, 427
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107cc
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�Aluminum L88, L89
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3931063
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68-69
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oval
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CLOSED
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396, 402, 427
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101cc
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3933148
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69-84
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oval
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OPEN
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366T, 427T
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112cc
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'69 396/265hp
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3933149
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68-76
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oval
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OPEN
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427T
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122cc
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3935401
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68-76
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oval
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OPEN
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427T
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3946074
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69&71
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rect
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OPEN
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427
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118cc
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Aluminum ZL1 '69
L88� "round exhaust port"
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3964290
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69-70
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oval
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CLOSED
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396, 402, 427, 454
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101cc
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Large or small hex
spark plugs used
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3964291
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69-72
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rect
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CLOSED
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396, 402, 427, 454
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109cc
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Large or small hex
spark plugs Used crate motor usage in years after 1970.
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3965198
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68-69
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oval
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CLOSED
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396
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Truck
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3975950
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68-70
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oval
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OPEN
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396, 402, 366T, 427T, 454
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Truck
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3986133
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68-85
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oval
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OPEN
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366T, 427T, 454
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Truck
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3986135
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69-73
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oval
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OPEN
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366T, 427T
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3986136
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68-84
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oval
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OPEN
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366T, 427T, 454
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Truck
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3993820
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71
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oval
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OPEN
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402
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113cc
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�255/114 ports
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3993820
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71-84
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oval
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OPEN
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454
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113cc
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�Passenger and Trucks 255/114 ports
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3994026
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71
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rect
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OPEN
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454
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118cc
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LS6
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3999241
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72
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oval
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OPEN
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402, 454
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113cc
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6272292
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70-78
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oval
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OPEN
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402, 454
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6272990
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70-up
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rect
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OPEN
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454
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118cc
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Service replacement
used on some MKIV crate engines
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10045427
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rect
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91cc
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Pontiac/Chevy Aluminum
Large Port Race
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10049875
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rect
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Pontiac/Chevy Aluminum
Small port Race
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10051128
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rect
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72cc
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Bowtie� Aluminum Symmetrical ports
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10051129
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rect
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Bowtie� Aluminum "raw" casting� Symmetrical ports
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10052902
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oval
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OPEN
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�427T
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MkIV
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10101140
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91-up
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oval
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CLOSED
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366T, 427T
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Gen.V
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10114156
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91-up
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oval
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OPEN
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454
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118cc
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Gen.V & VI
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10141279
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96-up
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oval
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CLOSED
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100cc
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Vortec 7400
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10487052
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77-90
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oval
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OPEN
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366T
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12363391
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96-up
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oval
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OPEN
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110cc
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Bowtie Aluminum
Signature Series fits MKIV Gen.V Gen.VI
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12363401
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96-up
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rect
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OPEN
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118cc
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Bowtie Aluminum
Signature Series fits MKIV Gen.V Gen.VI
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12558162
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01-up
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oval
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CLOSED
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496
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Gen,VII Vortec8100 8.1L truck
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12560241
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98-up
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oval
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CLOSED
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100cc
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Vortec 7400
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12562932
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91-95
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oval
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OPEN
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118cc
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Gen.V truck crate motor
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12562933
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91-95
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oval
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OPEN
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118cc
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Gen. V
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12562934
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00-up
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rect
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OPEN
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502
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Gen.VI Marine
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14011077
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69-up
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rect
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OPEN
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118cc
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Aluminum fits MKIV
"C-port"� also sold as a
"solid" head
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14044861
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84-96
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rect
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105cc
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Bowtie Aluminum� MkIV "raised
runners"� 1st design
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14044861
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96-up
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rect
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115cc
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Bowtie Aluminum
Signature Series� fits MKIV Gen.V Gen.VI "raised runners" 2nd design
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14044861
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84-96
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rect
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Bowtie Aluminum MkIV "raw" casting of "861" MKIV 1st
design
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14081045
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78-87
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oval
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OPEN
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454
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14081052
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85-87
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oval
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OPEN
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366T, 427T, 454
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Truck Marked "HiPerf"
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14092359
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86-90
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oval
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OPEN
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366T, 427T
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Marked "HiPerf"
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14092360
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86-90
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oval
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OPEN
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454
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Truck� "peanut" round ports
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14096188
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70-71
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rect
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OPEN
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454
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116cc
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service replacement
also used on later Mark IV LS-6 LS-7 and 454 HO crate motors
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14097088
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91-up
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rect
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OPEN
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454/502 HO
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118cc
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Gen. V
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24502585
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97
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rect
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Aluminum Olds/Chevy
DRCE 2� "Pro Stock" for
blocks with 4.900" bore spacing
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25534404
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04
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rect
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Aluminum Olds/Chevy
DRCE 3 "Pro Stock"� for
blocks with 4.900" bore spacing
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T = Tall deck Oval includes both "peanut" (also called "round") ports and large oval ports
We would like to thank everyone that has contributed to the data provided on this site.
This information has been gathered from several sources and has not been verified.
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