Valve Calibration
Thread Starter
Junior Member
Joined: Aug 2003
Posts: 1
Likes: 0
I recently bought my JUN type 3 cams but i cant get the right calibration on the valves.
Someone that knows please tell me....
I know that for stock DOHC is 25 in the intake and 20 in the exhaust,
but i cant get it right.
PLEASE HELP>>>
Someone that knows please tell me....
I know that for stock DOHC is 25 in the intake and 20 in the exhaust,
but i cant get it right.
PLEASE HELP>>>
Senior Member
Joined: Nov 2002
Posts: 612
Likes: 0
From: City of Boost
I hate to be a nitpick but you can't calibrate valves, you can adjust valve lash, you may have to experiment with it. If you are having trouble, you should attach a vacuum gauge to the intake manifold, and monitor vacuum levels at idle and try to achieve the best idle vacuum. A stock car will idle at about 21" of vacuum, so use that as a reference. You may have to increase the valve lash to get the right idle vacuum which will mean a noisier valve train. Good luck to you man.