Join Date: Feb 2010
Location: Gastonia, NC outside of Charlotte, NC.
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I know you guys are very passionate about helping a fellow out and a lot of your advice is very good.
Just from my experience, I have never heard much good about HS Rockers. They don't break is all I have heard but test done by Crane showed they flex way too much with high spring pressures.
Crane and Comp Cams both offered Rockers with different Ratios. When I worked on a top Winston Cup Team in the middle to late 80s before Jesels and rockers with studs and guide plates were still used, we had many different ratios. There were 1.73, 1.65s all the way to 1.5 for the Fords and 1.35 for Chevys for Break in Purposes. So, there are many ratios to play with.
Next, when you are working with the older Ford 429 and 460 Heads that had screw in studs from the factory and you want to install Guideplates you have to mill the stud boss down the thickness of the Guideplate because the stud will be too high and cause a lot of problems.
So take the advice of some of the posters who are trying to help.
Use a good quality Rocker, Crane is back with the new owners, S&S Motorcycle Company.
Comp Cams and Crower, Isky, and a couple of others.
Use at least an 8.550 to 8.650 Pushrod.
And mill down the stud boss the thickness of the guideplate.
See if that doesn't make a big difference.
Mike @ Performance Modifications.