Turbo size is gonna have a lot to do with everything. I went to 14 psi on 93 only with a small turbo without problems and added meth and increased timing by 3-4* without problems. Bigger turbo and I added more boost and timing without problem. Until I ran out of fuel ha ha

 

Buy some WCCH Stage II 317's, FAST intake, and a custom spec'd cam. With the right turbo setup, you won't need much more than 12psi to satisfy your power needs. It should still be fairly pump gas friendly too.

 

I haven't had my truck on the dyno in years but according to track times I would say 750+ rwhp on 17psi.

I'm not sure how much boost you can run without meth but I would think 10-12 would be ok with a good tune and plenty of fuel. I use meth all the time for safety and it does give you a huge power jump with the added timing. Just watch your IAT's and keep the timing conservative.

I will be running 8-10psi without meth on a stock 6.0L in my S10 soon but I will be adding meth as soon as I can find a good deal.

 

A little more about my set up I'm thinking bout running 370 cnc ported heads custom grind cam to match heads and turbo, 76 mm Borg tbss intake 90mm tb 80# injectors

 

With 76MM I've been 800RWHP on 91oct/meth at 15psi and 714 at 12psi on straight 91 No meth. 76MM JFR Isky triple 12 cam, stock 6.0L with hand ported 317 heads. BTW 800HP in my truck runs 10 flat to 9.90's, and 700HP runs mid 10's.

 

800 hp thats bad *** I'd be tickeled with 700 I have an isky triple 12 in the box still that I was thinking bout selling but maybe I should use it

 

People think they need these huge cams but I've been over 900HP with it at 20psi, and I'm pretty positive it's well over 1000HP with my S480 at 25psi. Just recently had a customer pick up 56RHP under 5K rpm with cam and tuning on otherwise stock 5.3L. The triple 12 cam really is for the 4.8~5.3L's and 6.0L 2500HD's. I usually recommend the 218/112 for the 6.0L~370's rcsb's.

 

212/212, .561/.561, 112 thats the cam specs and I actually bought it from you just realized it

 

If you've got it id run it. Sounds small for 370 but If I can make over 900 with it I don't see it restricting you much. And at the 900hp level my 76mm turbo, and full exhaust were running out of steam not cam.