Brent;
I too clay up the pistons on assy. to check for clearances, and so far, I've be good to go....running a very old "slightly re-worked" set of Edlebrock Performer RPM heads and a 650 Demon on my setup. Victor Jr. intake.
My rpm range on track is normaly from about 3000 to 6500 with the occasional spurt to 7000 depending on the track, races last form 15 to 25 minutes.....
I like the characteristics of the Comp cam I have, good idle, real good torque and not a loopy a$$ed cam, I hate those loopy cams, they may make good power, I just don't like them....I'd like to keep the duration at or under 288 like the comp cam has...my ideal cam would be the same thing I have with the Comp cam, but more lift, anything in the 615 to 625 range....this should get me at or near 500hp which is all I actually need for my use........and still have an engine that is not too radical and will give me the service life of the present one....
The setup I have now has been super good and dependable with very little mantinence. Once a year I pull the valve covers and check/set the valves and that's about it.
I may give you a shout in the next day or two and maybe we can discuss a cam..........236/242@ .050 duration should equate to 27? to mid 280's total duration???? if so, I'd be reallllllllllll interested in a similar cam..........
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If you're planning on going a little wilder on the cam, I would go with a billet cam and up the spring pressure. If you think you have room, you can shim the spring up a little more, as long as you have good retainer/valve seal clearance and coil bind clearance.
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Plenty room to get my spring pressure up another 25 to 40 psi, and I have real good retainers/locks and should have enough spring coil bind clearance for up to 715 lift area.
Thanks;
David