Jump to content
Forums Gone... but not forgotten!
Pontiac of the Month

Keane165's 1970 LeMans

2022 June
of the Month

  • Welcome!

    Welcome to Forever Pontiac, where we keep the memory of Pontiac alive with great discussion, maintenance tips, restoration/modification progression "blogs" and help from professional & DIY mechanics. Also, wonderful competitions that occur regularly. Please register for an absolutely free account to join in!

rocker arm ratio

Recommended Posts

My rocker ratio is 1.5.  Is it that critical or can I go with 1.52 without causing issues ?



Link to comment
Share on other sites

  • 2 weeks later...

Tired of these Ads? Register Today!

I can't find anything in any of my literature that would say moving from a 1.5 to 1.52 rocker would be detrimental to your engine.

The best way to be sure is if the engine is already apart, you install a piston to the crank, put modeling clay on the top of the piston, install the gasket and put the head on, torque it down, install the push rods and new rockers and torque to spec, and rotate the engine a few times. Disassemble the engine and measure the clay thickness at it's shallowest point.

Link to comment
Share on other sites

Thanks Frosty for you input. Since I Posted this and after your response I had ordered one of the 1.52 rockers to see if this would work. As you know, retailers do not have information on length / height/etc on a rocker arm.  It turns out this rocker is to long and goes beyond the valve stem.  I Did finally find the correct rocker at Kanter.com.  Exact rocker/ rocker ball and 5/16" nut.  #RA44044K.  Thanks again for you input. 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Tired of these Ads? Purchase Enhanced Membership today to remove them!
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.