Conventional wisdom says roller rockers increase horsepower by reducing valvetrain friction—with the biggest benefits showing up at high RPM. But Engine Masters’ David Freiburger and Steve Dulcich are always willing to question conventional wisdom and will leave no horsepower sacred cow untouched. They’ve tested parts to see what really works, built engines to find the
Q: I’ve installed a set of steel roller-tip rocker arms on my Ford 302 engine. The cylinder heads are also equipped with aftermarket rocker arm studs and pushrod guideplates. Unfortunately, the rocker arm nuts keep coming loose. What can I do? A: Most aftermarket steel roller-tip rocker arms use OE-style self-locking nuts. If your rocker arm studs
Got questions? We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we add new valvetrain components to old “camel hump” cylinder heads. R.B. Las Vegas, NV Q: I recently acquired a set of Chevy “camel hump” small block heads. I am putting in screw-in studs so I can use Harland
Got questions? We’ve got the answers—Mondays when the Summit Racing tech department tackles your automotive-related conundrums. This week, we offer advice for restoring a worn suspension and setting valve lash. From: Carlos Callahan • Stockton, CA Q: My Mustang’s suspension system is getting stiffer as it gets older. It’s a 1991 LX 5.0L
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