Installed a custom ground cam from comp,. a set of trickflow 59 cc heads with the 7.700 pushrods and a set of yella terra roller rockers. I went to prime the motor and then start it but when i went to prime the car,... the motor wont build any compression its just free spinning like creating a vacumm in the motor. So i took the rockers off and pulled the pushrods to seal the valves and then tried to build compression that way. It worked i built comprssion. So i then remembered the sims for the rockers. reinstalled everyting with the sims to see if i could get my valves to close so i could build compression, ya no luck. still no compression. For some reason my valves wont close, i thought everyone was using 7.700 pushrods with these heads at that cc. only thing i can think is there too long and my valves arent sealing thus not allowing me to make compression to start the car. Any ideas would help let me know.

Thanks guys

 

I would think it would be 7.35 or 7.4. Did you measure for the correct push rod?

 

I thought it was 7.7 for those heads as well since the valve angles have been changed. Maybe since u milled to 59cc the rods are too long, the out of box cc are 64cc so maybe the 7.7 pushrods are to be used if not milled and thats y they are hanging open.

 

My bad not sure about trickflow. Did u measure

 

If your not building any compression at all your Pr are way to long. Buy a Pr checker, its the only way to be sure. Stock Pr length is 7.4 and you have the heads milled, so they might be even smaller than that. Good luck.