What is the maximum valve lift that the stock 1.5 rockers can support?

I will be upgrading the springs/locks/retainers.

Thinking about xe high lift with accelerated ramp rates.

 

Rockers do not have a min lift spec that I know of.
the springs are what you need to worry about in terms of lift limits.

Thomas.

 

I would not run much bigger than the hotcam.

The cc306 destroyed my stock rockers with its tiny lift. Some people have gotten away with it, but after just a few redline pulls I snapped 1 and the rest were shot.

 

What RPMs were you pulling when it broke?

Thomas.

 

why go to the trouble of changing the springs and everything for the cam and not put some new rockers on it.

 

6400-6500 ish

 

a little more than .500 lift and you are going to be heading for trouble with the stockers

 

If you are replacing the cam with a higher lift cam that requires more spring, replace the rockers. You can alwys use a roller tipped stamped rocker designed for high lift if money is real tight. Like the Magnum rockers from Comp http://www.compcams.com/technical/Ca...106-07/268.pdf. Don't forget to use guideplates with these. They run $150-175 or so.

Rich

 

Cheaping out on rockers has put me where i am now. I put a rocker that had a max lift of .550 on a .610 lift cam. When i did it i didnt think about there being a lift max but to make a long story short i cracked a cyl put a whole in 2 pistons beat the hell out of the other 6 bent a rod and put a whole in one head while only banging up the other