360 with the 509 cam

Well, assuming you are currently at 8.3-8.5, I'd bet the gasket you're using is at least .055 to .065 thick.

You might be able to pick it up to 9.5, which will get you in the ball park. However, do remember what the others have posted here. The "508" MP cams (509 in the big blocks) like compression, and if you really want to get the most out of it, I'd recommend at least 11-1 with aluminum heads and not less than 10-1 with steel heads. Lack of good cylinder pressure, combined with the long duration of that cam, may make it soft on the bottom.

If you're gonna race it, shoot for the maximum power under low compression - otherwise, you'll be very disappointed (embarassed?) if you take it to the track and the fart pipe boys put ya' on the trailer (God forbid !)

Again, run what you want, but if it were me, and I was stuck with the lower compression, I'd go for one of the Whiplash cams from Dave Hughes.

If it's a big thumpin' sound you're after, Comp sells their "Big Mutha Thumper" series designed for low compression, but pounds out some radical tunes at idle.

Good luck with whatever you decide. I hope it runs great for you and do keep us posted !

Southernman