Quote:
Originally Posted by Mike S
I am building a mild 400 for the street car with leftover parts I have laying around. I installed a double roller timing chain I had laying around. I don't remember why I had it on the shelf. Had to be left over from the race car, Well anyway it seems very tight took a little tapping to get it on. Very little slack. After looking up the cat. number, it is .005 undersized. Do you think this would hurt anything or should I just order a new standard one?
Also it's been years since I installed a fuel pump drive on the timing chain. Is it worth filing the flange to get rid of the slop? It is really loose when I tighten the cam bolt.
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You did not mention what brand and style timing set you are using. People know that I am on here frequently talking up Cloyes timing sets. There is a reason. Cloyes checks the center to center distance on EVERY performance set they sell. 100% of the sets see the fixture, not 1 every 10,000 or whatever. So that's why your -.005 set is actually too tight like it should be on a block that has not been line honed ever or just a very minor touch up. If you have a Cloyes set you are working with, PM me and I can fix you up with a STD new chain only. I have a few. If any other brand, I would be very cautious mixing and matching sprockets and chains. If a flat link chain, absolutely do not run it tight. The only timing chain I have EVER had pull apart and break was a too tight flat link chain on a Buick V-8. It pulled apart at about 1000 miles and did allot of damage. I am not sure I fully understand what is going on with your fuel pump drive. The outer cup, sometimes called the "bearing", does run fairly loose and free without the pump arm pre-loaded on it. Make sure the camshaft nose sticks out past the camshaft sprocket and the inner cup pilots on the cam nose. They used 2 designs at least over the years, both will work. One has a tiny tab that indexes on the camshaft key slot and lines everything up. The more common design has a tab further back that indexes in a dimple in the camshaft sprocket. It is a larger tab. Good luck with it.