Mutha Thumpr issues..still

[grabber302]

I have posted about some of the issues i have been having with my Mutha Thumpr installed in my 302 no roller,non HO, non adjustable valve heads. Yes it is VERY hard to start when cold, but starts fine after engine is hot. I have also ground down the non adjustable pedistals slightly and this has helped with the noise I'm getting after the engine is hot. Perhaps slightly longer pushrods? Do i need to install thread in studs and get different rockers? Is there any Comp Cam part numbers to start researching? Again I've just pulled out the Xtreme energy 274 cam. Please point me in the right direction!
Kris

[iwannagofaster]

The best place to start would be timing. The Thumpr series cams always like a lot of timing. I would also recommend measuring for correct pushrod geometry. That will be a key in the noise and the timing should help with the cold starts. In all honesty, I don't ever use the Mutha in anything less than about 360 cubic inches unless it is a small, high compression engine. That is why Comp made three different versions, so every engine would have the option. Those cams also bleed off A LOT of cylinder pressure, so if the compression is low, combined with the small cubes, it will be hard to start and will not perform near where it should. I would perfer to see the screw in studs and guide plates in any application with an aftermarket cam, but that requires a lot of work on a Ford head. I would suggest a pushrod length checking tool and a lot of patience with this one.