Small Block Chevrolet Factory Piston Casting Numbers

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.
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