Hi guys,
Rick,
I promise to make it to RnG but unfortunately, it won't be this year, at least not with my car. I have too many other Cobras to finish at this time and that means my car comes last. My engine is progressing slower than I would like but I am making headway. Look for my 504 in '04
Schubeck gave me a contact at Comp Cams that grinds cams specifically to take advantage of the composite lifters.
I am running the flat tappet light-weight lifters. I'll bet they are 70% lighter than a stock lifter.
The cam blanks are hardened to a higher Rockwell factor and the lobes are very fast (for a flat tappet) and have a very short lash setting (.010" to .012") I also have the lobes cut with .003" more taper to make the lifter spin a bit more. The trade off is slightly increased lifter bore wear but I can live with that easier than a flat cam. I also mount the cam in a lathe and de-bur or radius the cam lobes then spin the cam and polish the lobes with increasing finer grades of Scotch-brite pads.
I run 190 to 200 lbs seat pressure and 500 lbs over the nose.(.698")
I know several people using these lifters (the flat tappets) and all report great success. Most of the national record holders in the NHRA stock classes are using them as well. One racer reports having used 15 different cams with the same set of Schubeck lifters. They also require no break in, just like a roller cam.
I like to try new things (within reason!) and the idea of the great simplicity of these lifters along with the cam specs allowed and the RPM that they are capable of I thought I'd take one for the team and try them out.
I would think that the Ford roller lifter would have a bigger wheel than a BB Chevy because of the lifter diameter difference (.842" Chevy vs. .874" Ford) I could see using a Mopar roller lifter (.904")
Maybe they're not stock size Chevy lifters.
I haven't had to bush the lifter bores yet. I have done it in some of the Clevelands that I have built though
DM,
Thanks for the info and I would very much like to hear about your unfortunate luck with the radius Schubecks.
I know that the radius lifters have gone through several transformations and improvements. I'm sorry to hear you were one of the unlucky pioneers
I'm running 58mm TWM/Weber throttle bodies
--Mike