11-07-2007, 12:51 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,455
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Not Ranked
Here's what I think I know from experiance and research:
There are 2 types of tappets/lifters: Hydrualic and solid. Both types can be had with either a flat bottom, or a roller bottom. Some people seem to mix up the terminology a bit, and that makes things confusing. You can't say a roller is better than a hydraulic.
The lobe profile of the cam MUST match the type of lifter being used.
New solid rollers are the bee knees. They work well, and last nearly as long as a hydraulic. They will certainly last longer than most people drive their Cobra's.
The only advantage to a solid lifter is stability at rpm's greater than 6,000 rpm's. Getting a hydraulic lifter to work well at 6,500 rpm is almost impossible. With the new stabilizer kit it can easily be done on a SBC. But not on any other engine.
If you don't road race the car, a solid lifter cam won't make you happy.
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