i have an 86 iroc 305tpi.my friend has an 89 formula 305 tpi we just put a 95 lt1 cam in his car (or so the guy says) and got nothing. i have hooker headers, dual flows, .420 .442 cam and ads superchip and big mouth intake self ported runners and plennum. he has edelbrock headers dual flows, underdrive pulleys, hypertech chip and 95 lt1 cam, should be .447, .459 something like that. both have 2.73 gears. i walk away from him like nothing the same as before the cam, should he not be faster? are we doing something wrong with his car his timing is at 10 degrees as is mine fuel press 40. any suggestions will be aprreciated. its center bolt valve covers, does it need roller rockers

 

Rollers would definitly help because they are more accurately adjusted....I have steel stamped on my 425 hp TPI.....im going to rollers to lower the friction....you need to find out the specs of the original cam and the new cam.....and any more than 114 degrees of lobe seperation is actually bad for the car....i dont know the exact specs....do a little research.....

 

425 hp TPI..

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