what piston would be best for a small shot of nos per say 150 shot or so? like flat top, dish, dome, etc.. anyone know?

 

they should make a nitrous piston application.

 

flat tops are the best for flame propagation. The shape of the piston is usually determined by the volume of your cylinder head and what compression ratio you wish to run.

 

Read up!

Ross Racing Pistons Technical Information

 

Very useful info. thank you

 

Non-re-entrant 154 degrees with centered bowls!!!

 

Pretty sure that would result in some wicked low compression on a gasser.

 

FORGED!!!!

the piston you need to use also depends on the size of the combustion chamber on the head (this determines if you can use a domes, flat top or dished to get the desired compression ratio, preferably 9.5:1 or lower for Nitrous IMHO), the size of the valves and camshaft lift to determine if you need big ole valve reliefs, and then if you are going to try to make it streetable and run on pump gas or if it'll live a life of C-16 or leaded high octane fuel.

 

I'd probably go with "non-wicked" in that application.

Disclaimer: I know nothing about Mopar muscle gasser pistons, except I have 8 in a stock '71 HP440, and 8 in a stock '70 340 - 16 total.

Oh, I almost forgot. There's 8 in the 440 sitting on an engine stand in the corner of the garage. I'm gonna take a look at those one of these days....

 

I ran SRP forged flat-tops with moly-coated rings in my old '67 Camaro (couple pics in my album). They yielded 10.2:1 cr with the 64cc World Products Motown heads. Had a Nitrous Express plate system with the 175 jets in there normally. Ran up to 300hp squirts a few times, but was severely traction challenged on the street.

People claim you can run up to a 100 shot on stock cast pistons in a small-block, but your fuel pressures and timing better be spot-on. For a 150 shot, I'm thinking hyper-eutectic pistons at the very minimum. Nitrous is fun in a gasser, but if yer gonna do it, don't half-*** it.

My engine consisted of the above SRP pistons and o-ringed heads, plus an Eagle 4340 forged crank, 4340 forged 6" H-beam rods and ARP main and head studs. Also had a dedicated fuel system (pump, filter, regulator) for the nitrous kit's fuel solenoid and an MSD 6-AL and timing retard box to make sure everything held together when on the squeeze. And it did. Few things sound better than a built SBC screaming at 8000 rpm on the street through 3" side-exit pipes!