How much is too much?

For the guys still playing with the stock bottom but have a heads/cam setup; how much are you spraying? I heard that since you are already moving more air/fuel thru the engine with the heads/cam that a 150 shot would be more deadly than on a stock engine, obviously with a supporting fuel system. How often are you spraying and how many miles are on your bottom end?

I've talked to Lloyd Elliot about a LE2 heads/cam setup and he ball parks that combo with supporting mods in the ~400rwhp range. Add a 150 shot thats ~550rwhp thru an M6 which comes to ~600hp at the flywheel. Is that really pushing the limits on the stock bottom end, especially the pistons. Or is this pretty common?

For the guys still playing with the stock bottom but have a heads/cam setup; how much are you spraying? I heard that since you are already moving more air/fuel thru the engine with the heads/cam that a 150 shot would be more deadly than on a stock engine, obviously with a supporting fuel system. How often are you spraying and how many miles are on your bottom end?

I've talked to Lloyd Elliot about a LE2 heads/cam setup and he ball parks that combo with supporting mods in the ~400rwhp range. Add a 150 shot thats ~550rwhp thru an M6 which comes to ~600hp at the flywheel. Is that really pushing the limits on the stock bottom end, especially the pistons. Or is this pretty common?

Actually a 150 shot won't get you 150 to the ground. You will have to tune it on a dyno with the jets to get 150 rwhp.

On my old hot cammed ported heads I sprayed an ocassiona 150 shot without problems. I wouldn't be comftorable spraying any higher on a stock bottom end. I usually sprayed a 125 or a 100 shot.

ZMAN

Having seen this question asked a few times I can tell you that the general consensus is that 125-150 is about the safe limit.

Having said that, there are apparently several people running as much as 200.

However, people running that big a shot are being very careful to keep a close eye on how the engine is reacting and they have made the appropriate upgrades in terms of fuel pump, injectors and wiring harness.

So, even though more air/fuel is being moved before the nitrous, the added nitrous shouldn't be a problem with all the safety equipment and fuel system? Or since there is already upgraded heads/cam on the car nitrous should be bumped down to a 'safer' level 100-125?

there are many heads,cam,150 shot guys on stock shortblocks. if you have a great dyno tune, fuel system and are pulling enough timing things should last for a while. The rods in our motors are only rated to 450hp. Many people go way past this number and are fine. Some blow up motors with only n2o. I cannot tell you what will happen with your combo. Is it safe? no, but then again you could easily spin a bearing with the top end package alone. So there is not real answer to if it is going to blow or not. Could you afford a rebuild? if you can't maybe you should not even use the n2o at all. if you really want to do i,t dyno tune with the jets your going to use, get a scanmaster and always run race gas when spraying.

I ran the 200 shot on a stock shortblock for 2 years and the only problems I have are an insane number of oil leaks. I am not telling you to do what I did. I started like everyone else and had the 100,s in, then the 150's, then the 175's and finally went to the 200 n and 175 fuel jet. Stock fuel pump, zero timing pulled and 110,xxx miles and a stock 10 bolt. It can be done but I wouldn't risk a nice top end set-up. I had home ported heads and a baby nitrous cam.

with that setup your talking about it sounds like a tune would be everything. a good one and you could be ok and make some real power, a bad one or none at all and you'll be hitting the parts for sale board.