The Chevrolet Big Block Camshaft Part Numbers

Camshaft Lift Duration Diagram

Chevrolet Big Block Camshaft

The Chevrolet Big Block used a variety of Cams over its production. The early production models came with either a Solid (mechanical) or Hydraulic Cam. Later year Big Block also came with Solid Roller and Hydraulic Roller Camshafts.

Identifying a Chevrolet Big Block Camshaft

Chevy Big Block Camshaft Part Number Location

The Chevy Big Block’s Camshafts can be identified by a number that is cast or stamped and is usually located in between the CAM lobes.

Chevy Cam Part Number Location

Chevrolet Big Block Camshaft Types

Chevrolet installed Three different types of Camshafts on the Big Block Engines. Early model Big Blocks were equipped with either Solid or Hydraulic Flat-Tappet Lifter Cams. The Hydraulic lifter Cams were installed on standard production engines. While the flat-tappet solid lifter camshafts were installed on race, street, or marine performance applications. Later Models also came with Roller Hydraulic Lifter Cams.

Camshaft Lobe Profile Type

Visual Identification

Visually identifying the type of cam will require looking at the lifter, as the lobe profile looks similar. Roller Cams use lifters with roller bearings on the end that rides on the cam. The Roller Cams have a flatter Cam lobe profile while Flat-tappet Cams use a pointier Cam lobe profile.

Camshaft Lifter Type

Camshaft Lift Duration Diagram

Chevrolet Big Block Camshaft Interchangeability

The Camshafts are interchangeable on most Mark IV to the Gen VI Chevy Big Block engines. The exclusions are the early 396 from 1965 to 1967 which has a channel machined on the rear journal. The reverse rotation marine engines, the 8.1L uses a different firing order, and the later Fuel injection CAMs don’t have a fuel pump drive.

Chevrolet Big Block Camshaft Part Numbers

Camshaft Part #	Year	Application / Engine info	Type	Lift Int.	Lift Ext.	Dur @ .050 lift Int.	Dur @ .050 lift Ext.	Lobe Separation	Hot Lash Int.	Hot Lash Ext.	Overlap
340282		BBC Competition Short Track	Solid	0.56	0.56	0.262	0.262				121 Deg.
353040	73-74	454 Corvette W/215 or 245Hp	Hyd	0.44	0.44	0.21	0.21	110.5
874872		402 w/240 or 300Hp	Hyd	0.398	0.398	0.197	0.197	113	–	–
3863143	65-71	396 w/375 or 425Hp	Solid	0.52	0.52	0.242	0.242	114	0.024	0.028	80 Deg.
3863143	65-69	427 w/425 or 435Hp	Solid	0.52	0.52	0.242	0.242	114	0.024	0.028	80 Deg.
3863143	70-71	454 LS6 w/425 or 450Hp	Solid	0.52	0.52	0.242	0.242	114	0.024	0.028	80 Deg.
3874872		396 w/265 or 325 hp	Hyd	0.398	0.398	0.197	0.197	113	–	–
3874872		427 w/335 hp	Hyd	0.398	0.398	0.197	0.197	113	–	–
3883986	65-72	396 w/350,360 or 375Hp	Hyd	0.46	0.488	0.213	0.217	115	–	–
3883986	65-69	427 w/385, 390, or 400Hp	Hyd	0.46	0.488	0.213	0.217	115	–	–
3883986	71-72	454 w/360, 365, and 390Hp	Hyd	0.46	0.488	0.213	0.217	115	–	–
3904362	65-71	396 w/375hp	Solid	0.52	0.52	0.242	0.242		–	–	80 Deg.
3904362	65-69	427 w/425 or 435hp	Solid	0.52	0.52	0.242	0.242		–	–	80 Deg.
3904362	70-71	454 w/450hp LS-6,	Solid	0.52	0.52	0.242	0.242		–	–	80 Deg.
3925533	65-69	427 L-88, Reverse Rotation	Solid	0.54	0.56	0.262	0.269		–	–	133 Deg
3925535	65-69	427 L-88 or w/430 and 435Hp Standerd Rotation	Solid	0.54	0.56	0.262	0.269	114	0.024	0.026	133 Deg
3959180		427 L88 Secomf Design and ZL1	Solid	0.56	0.6	0.262	0.273	110	0.022	0.024	135 Deg
3959180		454 LS7 or w/465Hp	Solid	0.575	0.615	0.262	0.272	110	0.022	0.024	135 Deg
3994094		Tunnel Ram, Can Am or Fuel Injection	Solid	0.6	0.6	0.286	0.286				148 Deg.
6272989		BBC Street or Marine	Hyd	0.5	0.5	0.222	0.221		–	–	121 Deg.
10185060		BBC Street or Marine	Hyd	0.51	0.51	0.224	0.224	116	–	–
12353920		BBC Street or Marine	Hyd	0.54	0.54	0.228	0.228	114	–	–
12353921		BBC Street or Marine	Hyd	0.475	0.5	0.208	0.218	112	–	–
12353922		BBC Street or Marine	Hyd	0.5	0.5	0.218	0.228	114	–	–
12361314		BBC Truck	Hyd	0.468	0.485	0.202	0.21	110	–	–
12361316	90-93	454 SS Truck	Hyd	0.485	0.49	0.21	0.218	115	–	–
12366543		502 Street	Hyd Roller	0.527	0.544	0.211	0.23	112	–	–
12552296	96	502 Gen V	Hyd Roller	0.48	0.483	0.204	0.209	110	–	–
14096209		BBC Street or Marine	Hyd	0.5	0.5	0.222	0.221	115	–	–	121 Deg.
19210721		572 620Hp	Hyd Roller	0.632	0.632	0.278	0.282	112	–	–
19211722		572 720Hp	Solid Roller	0.714	0.714	0.278	0.282	112	0.024	0.028
24502611		454HO and 502HO Street	Hyd Roller	0.51	0.54	0.211	0.23	112	–	–