| Description_ASM |
Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information. |
| Description_DEF |
Engine Camshaft |
| Description_DES |
4-Pattern 253/263 IB, 255/265 OB Hydraulic Roller Cam for Chevrolet Small Block |
| Description_INV |
4-Pattern 253/263 IB H-Roller Cam SBC |
| Description_EXT |
Recommended in larger c.i. and high compression applications. 3500+ Stall. |
| Description_KEY |
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10 |
| Description_SHO |
4Pt 253/263 HRlr SBC |
| Description_SHP |
None |
| Description_TRA |
Warning: Camshaft Optimized for use with a Melanized or Nitrided distributor gear. Not compatible with cast or steel gears without similar surface treatments. Failure to utilize the proper distributor gear will void all warranties and/or return policies |
| Usage |
Street/Strip |
| C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Camshaft Series |
4-Pattern |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Outboard Intake Valve Lift |
0.638 |
| Advertised Outboard Exhaust Duration |
319 |
| Outboard Intake Duration at .050 Inch Lift |
255 |
| Inboard Exhaust Duration at .050 inch Lift |
263 |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? |
Yes, but must be a race/competition only vehicle. |
| Inboard Exhaust Valve Lift |
0.622 |
| Inboard Intake Valve Lift |
0.638 |
| Advertised Inboard Exhaust Duration |
317 |
| Engine Family |
Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Advertised Outboard Intake Duration |
307 |
| Lifters Included |
No |
| Title |
4-Pattern 253/263 IB, 255/265 OB Hydraulic Roller Cam for Chevrolet Small Block |
| Lifter Type |
Hydraulic Roller |
| Camshaft Material |
Billet Steel |
| Outboard Exhaust Duration at .050 inch Lift |
265 |
| C.A.R.B. E.O. Number |
N/A |
| Valve Springs Required |
Yes |
| Basic Operating RPM Range |
3300-7,500 |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Grind Number |
305QIO8 |
| Camshaft Gear Attachment |
3-Bolt |
| Advertised Inboard Intake Duration |
305 |
| Assembly Lubricant Included |
No |
| C.A.R.B. Exemption Reason |
N/A |
| Cam Type |
Hydraulic Roller |
| Outboard Exhaust Valve Lift |
0.622 |
| Inboard Intake Duration at .050 Inch Lift |
253 |
| C.A.R.B. Exempt for On-Road Vehicles? |
No |
| Amazon ASIN |
B00CWZVB2C |
| Length |
3.0000 |
| Width |
7.0000 |
| Height |
12.0000 |
| Weight |
9.0000 |
