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The previous owner forced a hex bolt into the camshaft, which I have replaced both, but I am left with no bolt for fuel pump eccentric. Do I need to find a camshaft bolt or can I find a hex bolt with the same thread size? If so, anyone know what the thread count/pitch is?
It's just a 7/16" fine thread. You can you a plain bolt just fine. The hole is usually pretty deep, but a 1/2" long bolt or so would be plenty.
FWIW, you do need to keep the eccentric, or at lease some kind of plate, to keep the locator dowel in the cam.
The stock bolt comes in handy when using a roller cam. The stock bolt has a long nose that can be easily machined for a bushing to control fore/aft play.
The factory cam sprocket bolt actually has a bumper machined into the head that rides on the backside of the front cover. Yes, the angle of the distributor drive gear normally pulls the cam backwards in the block, but dynamics while running do cause the cam to sometimes walk forward a little. This bumper keeps everything in place. I would strongly suggest using a correct cam sprocket bolt for this reason.
You can buy the cam bolt from Dick Miller Racing. He sells a thrust button kit that includes the bolt and a thrust button that goes over the end of the bolt to reduce camshaft end play. He's not the most pleasant guy to talk with so don't expect a lot of chit-chat on the phone. I've attached a page from his catalog.
April 7th, 2018, 05:24 PM
