racinategra

I was wondering if anyone out there new what amount of clearance is neccessary to safely operate. I have recently installed COMP stage 2 cams in my b16 head and due to the amount of lift took them out to be safe. The clearance was 40 thousandths on the exhaust and 60 thousandths on the intake. I am runnin a b18 bottom end with CTR pistons. I was told I need to buy stiffer valve springs and retainers to safely run the car. Anyone have some ideas?

DonF

.040 is to close on the Ex. valve. .060 on the intake is just manageable.

rjay8604

It's those damn CTR's. They have a taller compression height than the other b-series pistons.

Just for anyone's informaiton the compression height is the distance from the pin center to the deck of the piston.

racinategra

so do you think it would be fine with stiff valve springs or not?

rjay8604

Hmm, recheck with the CTR's in. Then you can decide.

DonF

No, reading is a requirement to build engines.

racinategra

im not building the engine myself. the shop that is said it should be fine with stiff valve springs. i am running the stock b16 cams now, but the clearance problem is with my Comp Stage 2 cams

DonF

Use their recomendations, and check the warranty they give you. With B-16 you are prob. ok, but not with .040.