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Old 06-04-2006, 03:10 PM
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yea Ive got a 1969 camaro with a 350 sbc in it and im wanting to run nitrous on it. i was thinking about the NOS cheater system on it, but i was wondering what i would have to do to the motor to Handel the nitrous. as far as th motor it is stock on the bottom end. but the top of it has a new cam with duration of 300/300 and lift of .515 and a double roller timing chain and new lunati full roller rocker arms. and a eldelbrock carb and intake.

so what do i need to do next????

all suggestions are appreciated


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Old 06-04-2006, 05:38 PM
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Are the heads and pistons stock also? does it have headers and dual exhaust? if the mods you listed are the only mods you have on a otherwise stock engine your way overcammed, if you`ve been wondering where the bottom end power went to that`s why. The cheater system recommends the use of forged pistons and a hotter aftermarket ignition system along with high octane fuel around 105 or better. You can run the cheater system but I would do so on a conservative basis, no higher than 100 horses, and make sure you slow the spark timing down, otherwise it`s a ticking time bomb waiting to go off. You`ll also have to add another fuel pump to go with the nitrous, when you add nitrous you must add more fuel. The hotter ignition system is a given also, since nitrous hit`s the intake at minus 128 degree`s. If it were me and I wanted to shoot the full 250 to it, I would do a rebuild and add the components needed. Nitrous puts out a heap of exhaust, so usually a cam with more lift and duration on the exhaust side is desired.
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Old 06-04-2006, 06:06 PM
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I agree with Double.

A reasonable rule of thumb seems to be cubes x 40% = max nitrous hit
350 x 40 % = 140....... if the engine is ready for it.

Cast piston cars with 9/1 max compression are good for about 25-28 %.
350 x 28 % = 98 hp.

Above this level, unexpected, sudden, and spectacular things can happen.

250 hit on any engine has little tolerance for error. period. If your fuel system bobbles or your ignition misses..... oh oh.....

I would look into the ZEX system. I removes some of the problems.

Of course, some guys collect junk yard short blocks and just keep squirting them til they blow, then stick in the next one.... AMEN

Cam duration specs at other then .050 lift are worthless.
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