Roller Rockers in Stock

[Chris Hill]

Sorry I've taken a long time to reply, but here's what the engineering calc say:

1. If you take all the worst case conditions for a valvetrain force WITHOUT IMPACT occuring and current Stock Eliminator valve spring forces, the peak load is approximatly 1,000 lbs at the valve.
2. Per a test by David Vizard in his book, Small block Chevy Valvetrains, a stock Small block Chevy rocker arm breaks at 3,000 lbs.
3. The safety factor on the rocker is 3:1. In lay terms, the the rocker arm is 3 times as strong as it needs to be and will last a VERY long time if impact does not occur.

You can try to beat around the bush all you want, but a rocker with that much safety factor will not fail if the camshaft is designed correctly for engine speed.

Why am I very confident in my statements? Because I have run or supervised valvetrain performance testing and durability testing for 1000+ hours of spintron time.

A higher quality rocker will help the situation some, but it's like putting a band aid on something that needs stitches.

Better materials and heat treatment DO NOT replace correct design and engineering of the camshaft events.