Jarren_b

Im in the process of installing my ls3 top end on my ls2. I bought used PRC 66cc heads. Stock LS3 heads are 69.4cc's So they have had about .030 taken off of them. I took the heads to the machine shop today to have them milled just to make sure they are flat so I assume they will take another .005 off of them or something.

Im using an LS7 cam Specs are 211/230 .558/.558 120 LSA

Should i be worried about PTV with a cam that small? I know that I didnt have PTV issues before when they were milled about .030 but I had to take them back off due to a leaking head gasket.

What do you guys think??

Kip Fabre

No problem at all

thompson

iTrader: (4)

When in doubt it is always best to measure but if everything you have come up with is correct. PTV shouldn't be an issue.

Thank you,
Aaron @ Thompson Motorsports

Jarren_b

Well I didnt measure when I first put the heads on when they were milled between .025 and .030 but I ran the motor and also turned the motor over while watching the valvetrain. never noticed a problem with the valves hitting and the motor idled quiet and smooth. I would doubt another .005 would cause me any issue but I dont know a whole lot about cam specs. Ive heard that valve events are much more important than lift when it comes to PTV clearance