maroonls1z

Would like to eventually be able to run a 300 shot through a money maker, stepping it up slowly from a 150 of course. My question is at what point do I need to start worrying about head clamping force? Are oem cast ls7 heads alright for nitrous? I specifically only want to talk about head studs o-rings and what is needed to run large shots of nitrous 300-400

WE TODD DID

iTrader: (2)

300-400 isn't a large amount. 4 bolts will be fine with that.

maroonls1z

I'm being told by my engine builder that 400 is too much for a 4 bolt and they recommend a 0.035 right gap, does that seem high?

WE TODD DID

iTrader: (2)

Go with your engine builders recommendation. If you trust him to build your engine, then you should trust his advice.

If I was building the engine, I probably wouldn't recommend 6 bolts if you are budget minded. If you're buying everything new such as an aftermarket block and heads, it's a no brainer to use the 6 bolt stuff. .035" ring gap sounds good for around 4.080-4.100 bore. If you're smaller than that, it won't hurt either.

maroonls1z

Is there any downside to running that high of a gap except a small loss in hp and some blow by? I was going to run a catch can anyways. Just want to make sure that doesn't effect longevity of the motor. I've looked but can't find anything

WE TODD DID

iTrader: (2)

You'll never know the difference with them being a little too big. Better too much than not enough. I have one that I am building right now with a 4.071" bore. I'm at .032" top and .035" second. I'm anticipating 4-500+ on nitrous.