[Geoff]

There is no right or wrong rocker geometry. The narrow-est mark in the centre of the valve tip is very popular but it takes no account of what is happening on the prod side. What happens on the valve side in terms of lift & area under the curve ...... is times one. On the prod side it is times 1.5 [ for a 1.5 rocker ]. David Vizard's BB Chev book has a chart of various rockers he tested. Lift at TDC & max lift was tested as well as the overall ratio. The numbers are all over the place & show you can spend a lot of time to gain nothing except a warm & fuzzy feeling.

[Bill Meyer]

Put a .050 lash cap on and try it again. You have the right retainers

[HWYSTR455]

Originally Posted by Geoff

There is no right or wrong rocker geometry...

This is not true, there is definitely a right & wrong. There may be a little wiggle room due to the fact that pushrods generally come in .5 increments, but if you're more outside of that, it's 'wrong'. Or at least not 'optimum'.

The problem with the Comp roller tip arms is really more about the varying ratio than the usual regurgitated rocker ball issue, which some say they have corrected (to a degree, pun intended).

Just because Butler offers them they may not be 'optimum' for YOUR engine. Lower lift cams and less aggressive profiles won't be impacted as much as the opposite. So what 'works' on one engine may not work with another. And vendors may offer 'budget' alternatives to not chase customers away.

Do it right, do it once.

These would be a much better option, and still on the 'budget' side:

https://butlerperformance.com/i-3164...tegory:1459691

Get what you pay for.

Been there done that, but never tried those Butler stainless ones. I only buy one now, they last forever, and there's no question:

https://butlerperformance.com/i-2445...tegory:1459691

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[HWYSTR455]

As a test, check patterns on ALL the rockers. Then you will see how far out of whack (or not) they are.

Also, it is possible the intakes may require a diff length of rod than the exhausts, which is basically a factor of valve availability and the fact that some exhaust seats may have had to be cut diff due to valve recession.



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