I need a few opinions on this subject. I have a tr.224 with a .563 lift, stage 2 heads that have been milled .030. At the present time I'm running 7.350 pushrods. My question is can I run 7.40 pushrods, the way I figure it is with a .563 lift and heads milled at .030 I'm loosing .020 in lift. If I use 7.40 pushrods I will be at a .593 lift, Is this correct? The gasket is the graphoil which came on my 2001 Z-28. I have Comp Cam 918 bluestripe springs is the .593 to close for the .600 lift? Thanks for any comments.

 

I do not have an answer for ya. But, you may get better response in the Internal Engine area.

Just my 2 cents

 

With the milled heads I'm pretty sure you'll need to stick with 7.35's tho. I wasn't under the impression you're losing any lift b/c of the milled heads....you use shorter pushrods to even out the valvetrain geometry due to the milling of the heads. That's why you use shorter PR's, so that you retain intended original cam specs.

Also, the blue spring 918's were originally rated to .625" lift until the 921's came out. Then they lowered the 918's rated lift specs, for whats believed to be purely marketing reasons.

 

Thanks for the Info. it makes perfect sense to me..