Join Date: Apr 2001
Location: Central West Virginia
Re: Solid flat tappet to solid roller
You may gain nothing, you may pick up a couple tenths. I know people on each end of the spectrum. You -should- pick up a little power, however don't expect it to be a different engine. A guy I know with a 351C installed a solid roller with apparantly the same specs as his solid, and ran exactly the same as he did before.
If it's a RACE car that sees limited street use, it might be worth it to step up to the roller. If it's a STREET car that sees a lot of miles, you'll probably be better off with a modern designed solid flat tappet... or a hydraulic roller if you don't rev it too high.
Engines that respond to solid rollers the best, are ones that need all the lift they can get. In other words, if the engine has fairly small heads for its displacement, it's going to need the valve lifted as far and quicky as possible, while keeping duration in check. A roller stands a much better chance of making a significant difference on this type of combo.
Your 393W with stock Edelbrock RPM heads would probably be a good candidate, as long as you don't mind keeping a CLOSE eye on the roller lifters, and it doesn't see TOO many street miles. Keep the idle speed up, and run a fairly tight valve lash to minimize pounding on the valvetrain.
Last edited by n2omike; 10-21-2008 at 05:27 AM.