rocker arm ratio 0n 392

jim d · Post by **jim d** » Tue Aug 30, 2005 7:26 pm

any one know the intake & exhaust rocker arm ratio's i am trying to determime the lift of a cam i bought the lift on the cam measures .280\.290. no numbers or mfg. on the cam looks like a regrind. JIM

392heminut · Post by **392heminut** » Wed Aug 31, 2005 8:05 am

The factory rocker arms are rated at 1.5 to 1. That would put the valve lift for your cam at .420/.435.

Bailiesdad · Post by **Bailiesdad** » Fri Sep 02, 2005 11:53 pm

To get accurate ratios it is best to setup and measure the actual lift at the valve stem or retainer with a dial indicator and magnetic base.

Many stock arms are off and there a ton of rebuilt arms with variances, along with different ratio aftermarket arms.