This is for a buddy of mine its a 355lt1, 4 bolt main vette block with a GM Steel crank, Mainley Forged Rods, and Lunati NItrious pistons. The car has a set of ported heads and a cam, it dynoed little over 500rwhp on a small shot. Hes wondering how much more he can spray it before it becomes dengerous. The car has a Direct Port nitrous system, fuel system and tuned with Gen7 dfi.
any inputs would be apriciated, someone told him that he should spray more then he already has but i dont think that is correct.
thanks

 

If setup properly the block will take a good bit more. Big Rick's put over 1200 to the tires if I'm not mistaken. Nitrous is not as forgiving. I'm planning on 1100 at the crank with my nitrous LT1 block but that's with block filler and premium (Callies, Oliver, etc...) components. If I were him I'd worry more about that GM crank than the block.

 

well hes worried about the whole set up, thats what i ment sorry. How much can that praticular buttom end handle? its not 2 bolt splayed its just a 4 bolt vette block
anyone know?

 

Well, I'm spraying a 2 stage 100 + 50 shot on a heads and cam LT1 with stock 4 bolt main shortblock. Dynoed right at 500 rwhp with the spray. I think you'll find that as long as the tune is good and you've got an adequate fuel supply that you'll be fine. I'm also using a MSD digital 6 to pull a few degrees of timing when the window switch enages.

I will be upping the second stage a little in my quest for 10's on the stock LT1 short block.

This is a NX MAF dual stage setup using a Harlan window switch on each stage. Currently stage 1 - 100 shot @ 3500-6100rpm, stage 2 - 50 shot @ 4900-6200rpm. Shift points set at 6200, 3000 stall converter.

Last time at the track in poor racing weather and 800 psi bottle pressure it ran a 11.3@123 with 1st and 2nd gears loading up with too much fuel because the N2O pressure was too low.

It's the big spikes down low in the rpm range that will break things.

 

Guys have exeeded that level with whole stock 2 bolt bottomends and not had problems, just need all your safeties operating right.

 

I've had my bottom end to 505rwhp and 560 rwtq on a 75 shot. Im running stock crank, ross pistons, eagle H-beams on a 2 bolt main block. He should be fine for a good bit more than he has right now.

 

I wouldn't think the 4 bolt is the weak point....sounds like he has a good setup and I would think him safe raising the shot as long as he has a good tune (which I would assume having DFI) and he's using all of the precautions ie FPSS, window, condom's, etc.