Factory ID #3896929 for: 327 c.i. 1965-68 factory 275/300 HP 350 c.i. 1967-69 factory 295 HP 350 c.i. 1970 factory 300 HP 350 c.i. 1971 factory 270 HP 350 c.i. 1972 factory 200 HP. For Carb or Tunable Fuel Injection Cams for '55-'57 engines can be custom ordered. The '87+ Chevy Small Block received provisions for Roller lifters. Most '87 - '93 GM cars came with Roller lifters but most '87 - '95 trucks came with flat tappet lifters in Roller lifter style blocks. If a Roller Cam is desired and your block has OEM-style Roller Cam provisions. Many OEM EFI systems cannot be tuned to run well with certain cams. Before installing in an OEM EFI engine be sure to check with a competent tuner. Cams for '55-'57 engines can be custom ordered.