[swb85]

Thanks for the replies guys! I'm going to a couple machine shops for prices this afternoon. Based on what you guys have said and what I've been reading, I think I'm going to go with some aluminum 64cc vortecs that have been machined to accept higher lift. I'm planning on running quite a bit of cam in this motor (230-240ish duration) so I'll need over .500" lift capability. I have a couple dirt track racer friends, so maybe I can get a few bucks out of the stock 300 horse heads from them.

Right now I'm thinking Scat or Eagle cast crank, rods that'll handle up to 500hp and some flat top speed-pro pistons/rings and aluminum vortecs and airgap vortec intake. That should get me around 10:1 compression. I've already got 1 3/4" longtubes & 2.5" duals so the exhaust is taken care of. I'm keeping the 4 speed so I should be able to get away with a little wilder combo than an auto and still be very streetworthy. Right now my biggest concern is the machine work. Should I let the machine shop put the shortblock together or do it myself? I've never built a bottom end before, but have done tons of top ends. Any other input?

Piecesparts: If you need some LS1 help, give me a hollar....I've got more than a little experience with them.
http://video.ls1tech.com/search/asa/...1e00a493a3.htm