GM P/N

ENGINE

CR/Chamber CC

Dome Type

Pin Type

Material

Usage

12514101

350

8.5:1/76cc

Dish

P

Cast

350/190HP

-

9.1:1/64cc

-

-

-

350/285HP

-

-

-

-

-

Crate motor

12361371

350

9.1:1/64cc

Dish

P

Cast

350/300HP Crate motor

10104455

350

9.8:1/58cc

Flat top

P

Hyper

ZZZ 1St design Crate motor

10181389

350

9.8:1/58cc

Flat top

P

Hyper

ZZZ 2nd design Crate motor

12520264

350

9.1:1/64cc

Flat top

P

Cast

350/300HP

3946876

302

11.0:1/64cc

Dome

F

Forged

'68 to '69 Z-28

3942543

350

11.0:1/64cc

Dome

P

Forged

'69 L46

474192

350

9.0:1/76cc

Dish

P

Cast

350 L82

3989051

350

11.0:1/64cc

Dome

P

Forged

'70 LT1

14011020

350

12.5:1/64cc

Dome

F

Forged

Heavy-Duty/NOTE 1

14011021

350

12.5:1/64cc

Dome

F

Forged

Heavy-Duty/NOTE 2

14011026

350

12.5:1/64cc

Dome

F

Forged

Heavy-Duty/NOTE 3

14011027

350

12.5:1/64cc

Dome

F

Forged

Heavy-Duty/NOTE 4

P= Pressed-on pin; F= Floating pin., Hyper = Hypereutectic

Part numbers are for standard (Std.) bore sizes.

NOTE 1: use with 5.7" rod in cylinders 2, 3, 6, 7.

NOTE 2: use with 5.7" rod in cylinders 1, 4, 5, 8.

NOTE 3: use with 6.0" rod in cylinders 2, 3, 6, 7.

NOTE 4: use with 6.0" rod in cylinders 1, 4, 5, 8.