Quote:
Originally Posted by pete315
Thanks for the info Cliff. Guess I'll stay away from the XE262 and go with the Summit. I'm going down today to pick up the heads. I know I had new stock springs put in. Do you think the Summit 2801 would be too small?
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It`s not a matter of the 2801 being too small[ to an extent], it`s if you have the right springs to handle the lift of any given cam. Valve lengths can be an issue also. One must check for coil bind[ spring stacking] and retainer to guide clearance, among other things.
One needs to know how cubic inches and compression affect which "size" of a cam he chooses. Any cam will "act smaller" in a larger engine. So, what`s good for a 350 or 400 can be too small for a 455.
One needs to choose a cam to get the results he wants for his CID, then he needs to make sure it will "fit" in his engine. If the valve will only open so far before it bottoms out on the head or hits a piston, one needs to create enough space to accomodate such a cam.
Also, cams need a spring PRESSURE to go along,or you will "float" the valves. So, when buying a cam, check for spring pressure, coil bind, piston to valve clearance, and retainer to guide clearance at a minimum. The larger the cam, the more important.
This might help.
http://www.fortunecity.com/silversto...build/cams.htm