Re: Performance Gain Stock Rockers to 1.5RR?
 

And since we're on the subject, the"aftermarket rocker arms" that "reduced rocker arm deflection" and allowed the "stabilization of the valvetrain" ALSO made it a necessity to port your heads and intake if you wanted to stay competitive. In other words, in the good old days, you could either run well and keep your stuff together for a 7 round race or go fast and gamble on when you were gonna break a rocker.

Re: Performance Gain Stock Rockers to 1.5RR?
 

I ran treated and coated stock rockers that we machined to work with a 7/16 stud on my LT1's. I saw no performance gain going to a roller rocker. Limited travel lifters was a different story.....

Re: Performance Gain Stock Rockers to 1.5RR?
 

The truck engine liked the 7/16 studs they had less deflection than the 3/8.

Re: Performance Gain Stock Rockers to 1.5RR?
 

Building the Pure Stock engine replaced the 3/8 with a 7/16th stud figuring it was a good bit stronger. Cannot remember the racers name he sent me his modified LT1 SA Stock Rockers. Bought new 7/16th ball, installed them and runs smooth.

Like Billy said, he saw no gain going to Rollers.

Many of our Impala Club members stayed with the Stock LT1 SA rockers installing the popular HotCam with no problems. Figuring the 3/8th Stud was not much of an issue to begin with.

Wondering if someone makes a 1.5 SA Roller Tip?
Use the 7/16th ball and trim the sides up to fit.
Would stop all side loading on the valve and guide.

I have set of original GM SA 1.6 Roller Rockers.
Then again they use 3/8 stud.
Saving them for a project.

Re: Performance Gain Stock Rockers to 1.5RR?
 

I’ve deleted the pics of some of the pushrod/rocker arm combo’s I had”generated”, before I switched. It wasn’t any faster on track, but I didn’t have one cost me a semi at a Division race again either.

Re: Performance Gain Stock Rockers to 1.5RR?
 

Why don’t you try them and see for yourself.

Re: Performance Gain Stock Rockers to 1.5RR?
 

Many years ago, due to the pushrod tip going through the stamped rocker arm pushrod seat, I took a set of Oldsmobile rocker arms, laser welded a piece of 4130 Chrome Moly steel that had been cut and shaped to the contour of the rocker arm pushrod seat, and then had them solution heat treated. It was a matter of longevity than performance; the modified rocker arms were heavier than the OEM replacements by a lot.

The owner of the car approached Danny Gracia at a race, showed him the damaged rocker arms and what he was planning to use in lieu of the OEM replacement rocker arms. Of course, Danny immediately said they would be illegal and he could not use them. Then, some time later, Clark Holroyd comes up with the same concept and design for Chevy and Pontiac engines and were deemed legal to use by Danny.

It appears to be the case of who you are and who you know.

Re: Performance Gain Stock Rockers to 1.5RR?
 

Any cam duration, any valve spring, adjustable push rods, adjustable rockers , roller rockers and now solid lifters. The evolution of what we have today.

Re: Performance Gain Stock Rockers to 1.5RR?
 

I had noticed that a couple times about Danny = More often years ago

I "think" he actually likes me now after 30 years.

I would have never got away with modifying the cast rockers.

We broke plenty of them on Mopars and a few on my Big Block Chev.

Re: Performance Gain Stock Rockers to 1.5RR?
 

John,

I modified the rocker arms only to address a weakness on the OEM stamped rocker arms after the allowance of higher pressure springs and lifting the duration and overlap specs on the camshafts. They were not installed.

We asked permission to use them and were rejected.
My issue with Danny was the fact that later on, he approved the same exact modification from Clark Holroyd for BBC and Pontiacs.
No matter how it is addressed, Danny was always controversial in many of his decisions throughout the years.