I'm looking at a budget build 355 that will see a 200hp plate shot of N2o. Say for the sake of argument the engine puts out 375hp N/A and probably wont ever go over 6500rpm. Forged pistons are a given, but how about a crank & rods? Can a GM crank be trusted here? As far as rods, would some Scat 4130 forged I-beam rods be fine?

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11.74@118mph in full street trim, driven to the track every time! Trailers are for boats..

Youll be taken a chance like a flip of a coin!
My buddy ran 175 on a 400 he yanked from a suburban for 2 years in a 78 camaro ran 7.7 eigth mile all stock heads pistons everything! probrably had 200,000 miles on it never blew, then he sank $6,000
in the same 400 dynoed at 630 hp N/A
he blew it first time out! special crank, rods, pistons and all!

I tried a 150 kit on my 355 a few years back, felt like nothing more than like I was giving the engine more throttle. Not violent, just a nice addition of power. LT 1 TRW pistons, stock rods, stock cast crank. Engine made maybe 350 HP. You should have no issues with the parts you selected unless you do something wrong with assembly or have fuel issues while on the bottle.

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A Canadian, EH? (with a 10 second street car)

Yeah I'd think you'd be OK. I ran a 355 with the same TRW LT1 clones rust used, a set of "X" rods, a cast crank, Eddy RPM heads and a 250 horse NOS plate. Went through 400 pounds of nitrous and never hurt the motor. Shifted at 7200 for a long time, but found it ET'd a little better shifting under 7k. It was a grenade looking for a place to hurt somebody for sure, but she never did.

Best I can say is "your actual milage may vary" http://www.nastyz28.com/ubb/wink.gif

I agree that you will be okay... I ran 200 shot on a bone stock short block for 2 full years.... With bolt on's, heads, and comp292h hydraulic cam I got the car to run 11.30's, (5100 ft DA!!).... On my new combo I'm squeezin 350 shot, so I went all out for the forged rods, crank, and nitrous pistons... One year later, so far, so good... Nitrous is great.. http://www.nastyz28.com/ubb/smile.gif

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Brant
2nd Gen Camaro
10.41@132.3
Need Nitrous????
http://www.rocketworldracing.com

Thanks gang http://www.nastyz28.com/ubb/wink.gif
I kind of want a little overkill because I see this happy gas is a bad habit! Good thing is I'll have to upgrade my kit to go over 200hp, so thats a plus in a way. I just wasnt comfortable spraying the current 383 because of the GM rods & hyper pistons. I only did the 150 shot a couple times, no damage but I wasnt breathing till I got to the et shack either!

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11.74@118mph in full street trim, driven to the track every time! Trailers are for boats..

Just a theory here.... but ive seen it happen alot... and i think it might be true...

im thinking that a engine with alot of miles on it, say 100,000 + seems to take Nos easily.... almost like all the parts are tried and trued.. and have made them selves comfortable, and worn in good together, and the nos doesnt hurt it that bad..
but a newly rebuilt engine, even though its "broke in" has higher chances of failure.

The big wide clearances in the worn engine are what save it.

The higher cylinder pressures make the crank flex more, and the larger clearnances let it without biting the bearings. Also it lets the rodstake a bit more punishment as they larger amount of oil in larger cleanances in the rod bearings acts like a shock absorber. This is assuming you have a pump that can fill those larger clearances...

My engine builder builds his nitrous motors with extra clearance - and we have never killed the bearings.