AFR 165's with TF stage1 cam and 1.7 RRs?

[RTGreen]

Will I have clearance issues trying to run a 1.7 rocker with AFR 165 heads and the trickflow stage 1 cam?

 

[Notchbck93]

.535 total lift is what the car can take. Depends on when the valves open an close. I have the E cam with the 1.72 RR's .53492 LOL, and it is right at the limit when I clayed it. .075 clearance was all I had!

 

[Michael Yount]

You have to measure to be sure. Every combination is different when it comes to measuring tolerances. However, peak lift isn't the problem. The pistons are WAY down the cylinders at peak lift. It's during overlap that clearances are tight, and at that time the valves are only open around .050". Consequently, 1.7's will reduce your p to v clearance only by about 3 or 4 THOUSANDTHS compared to 1.6's. You're looking for minimums of .080" on the intake valve and .100" on the exhaust valve.

 

[Matt90GT]

Stock E7s, stage 1 and 1.7s, Trick flow said no problems there, just need upgraded valve springs. They never got back to me on any rate specs.

 

[Michael Yount]

HUGE difference with stock E7's because the valve size matches the relief size cut into the pistons. His AFR's have 1.9" intake and 1.6" exhaust valves - they are larger diameter than the reliefs.

 

[RTGreen]

Thanks for the help guys