roller cam with flat tappet lifters December 17, 2009 08:45AM
Can you run a roller cam if you have flat tappet lifters? Needing to get a new cam and was wondering if you could do this? Thanks in advance for the help.

Re: roller cam with flat tappet lifters December 17, 2009 09:09AM
NO

Re: roller cam with flat tappet lifters December 17, 2009 10:14AM
Can you run roller lifters with a flat tappet cam?

Re: roller cam with flat tappet lifters December 17, 2009 10:55AM
No. Flat tappet cams are cut to spin the lifter, rollers can't spin and the roller will cut a grove into the lobes.

Re: roller cam with flat tappet lifters December 18, 2009 05:17AM
If you have ever seen a ROLLER cam and a FLAT tappet cam, the same grind looks totally different from each other. They are not interchangable!!!

Re: roller cam with flat tappet lifters December 19, 2009 02:35PM
I just went to my machine shop and saw a mix match mess. A roller cam with flat tappets WILL NOT WORK AT ALL. The flat tappets will not spin in the bore and will gall and cut the cam. Usually the cam ramp is much too steep to lift the lifter withour gouging the cam with the edge of the lifter.

Re: roller cam with flat tappet lifters December 20, 2009 01:51AM
roller lifters ride only on the tip of the roller (a very small surface area). Flat tappet lifters ride on the entire surface of the tappet (a huge surface area). So the cam actually starts lifting on the edge of the tappet. Then slides across.

This is why the 2 dont interchange

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