crazygn

iTrader: (6)

iam building my setup soon and need to know at what size cam will i need to cut the pistons. I'll be running ls6 heads or 5.3 heads. Is there a cam lift to cut the reliefs.

JPH

iTrader: (2)

theres alot of other variables involved? Heads, gasket thickness, deck clearance, and cam profile, etc..

Torkman15

iTrader: (2)

Above .600 lift or so depending on duration. Just check your clearance when assembling the motor.

Good luck, Tom

crazygn

iTrader: (6)

thanks , i was looking to run around 580 lift, with some 5.3 heads, maybe around 11.1 com , its also a stock bottom end with flat top pistons. other stuff unknown now just getting a idea where iam going with it.

Gary Z

Maximum lift is not a deciding factor because it does not occur when the piston is near TDC. Max lift is only indirectly a factor because high-lift cams tend to have longer durations than lower lift cams. The most critical factors are the intake-valve-opening (IVO) and exhaust-valve-closing (EVC) points. Thunder Racing’s T-Rex cam’s IVO is 12 degrees BTDC and EVC is 13 degrees ATDC. These values can be considered the most extreme for safety with stock (unmilled) heads and no valve relief. As the others have said, there are many considerations and it is best to check whenever there is doubt.

crazygn

iTrader: (6)

what iam think about doing, need to check cost first, but i think i might just have a custom cam made or i could check price on just getting the pistons cut now so i can run most cams

JPH

iTrader: (2)

whatever you choose craygn, if your PTV is to close for comfort, you can always flycut the pistons in the car.