I've thought it over again and again, this time I know officially what my plan is. I'm going to build a motor first, that's ready for boost, then with a small savings I'll make in the next few months get the trans rebuilt along with a good clutch, then it's off to the rear end. Eventually maybe by next year I can buy that FI kit. I'm going to be looking for a motor build starting now. Two weeks I'll have the funds.

My goal for the motor build will be forged internals, small blower cam, probably stock 317/LS6 heads. I don't know if I want to buy a 347 ($2800), 370 iron ($3300), or 408 iron ($3500) forged shortblock from a sponsor. I want a safe, reliable, long lasting daily driver, 600+ RWHP, on about 8-12 PSI. Which dished pistons should I get? Mahle, Wiesco, or Diamond? I heard Mahle last longer, and Diamond puts up better numbers? And what compression do I need to be making? I heard most turbos around 8.5:1 or 9:1 and EPP recommend 9.5:1 for the supercharger.I haven't decided if I want a turbo build or a D1 or F1 build, probably which ever of those systems are cheaper & I can rely on most.

The car is a m6. I have all LS1 stuff from two longblocks I have. My budget for the motor is $4000. I know if I went with a 347 I could have a little extra money to buy the other supporting mods (like cam, or heads, clutch, etc). Also I could save a little money if I bought the shortblock from another member. Would taking that chance to save a couple hundred be worth it?

 

If I build another I will be going with a LSX 427. I currently have a 6.0 litter Iron Block 408 and F1R Procharger. We are having a little head trouble right now. I like that the LSX has the extra head bolts and is rated to 2,000 HP

 

wow! 427 FI. that's a dream setup!! good luck with it! if you might be interested in selling that 408 shortblock give me a shout!

I think I've decided on turbo. And only 500+ RWHP. will I benefit from a forged crank? keep in mind I'm wanting this setup to last awhile on about 6-10 PSI. If it's almost useless for those goals to have a forged crank then I think I'll go with the 370 from TSP. And still need ideas for pistons. I'll want to run about 8.5-9 CR with turbo.

 

dont need a forged crank unless u want more cubes(read faster spool,more power off boost).for 500rwhp u can stay stock cubes or spring for the 370,just depends on the size of the turbo u go with.stock cubes with a TC76 from forcedinductions.com would make a nice "cheap" combo

 

stock crank can take 1K+++++ WHP, Im going with compstar rods, diamond 2618 alloy pistons, GM crank, and billet mains (only becauase i want to eventually hit 1K WHP) from EPP, and building the motor myself.

 

my dream engine would be a low compression 427

 

so everyone thinks I should be ok with the factory GM crankshaft? I'm starting to lean toward the 370 build.

 

Yes, you won't have a problem with the stock crank, we have leaned on them pretty heavily over the years. Bob