Horsepower is in the heads. But for a cylinder head to breathe efficiently, the valvetrain must be rigid and strong to minimize flex, but also lightweight. For most performance applications, that means replacing the stock rocker arms, valve springs and pushrods with some type of aftermarket roller rocker arms, stiffer valve springs and stronger pushrods.
The Hemi has made a comeback in recent years in various Chrysler and Dodge vehicles, most notably in the Charger and Challenger. But for hardcore Hemi fans, the real deal goes back to the first-generation 331/354/392 mills that culminated in the “Elephant Motor,” the 426 Street Hemi of the Sixties and Seventies. Even though the
To the naked eye, a valve is a valve is a valve. Sure, there may be two, three, four or more of them in the cylinder head, but unless you have x-ray eyes, one alloy looks pretty much the same as another. The importance of coatings to today’s valves should not be overlooked, of course.
Even though the valvetain plays a supporting role in the overall performance potential of an engine it can still be a make or frequently break proposition for engine builders. In a street performance application in particular your customers are usually quite proud of their vehicles and spend a lot of money on appearance.
Do you outsource cylinder head repairs that require welding? If so, you might be missing an opportunity to generate additional income for your shop and reduce turnaround time for customers. Here’s a look at how you can potentially increase profitability and productivity by bringing it in house. Doing these kinds of welds successfully requires
November 2008 GM LS1 Stroker sponsored by 5.9L Cummins sponsored by 3.8L Buick sponsored by