I'm curious as to how much spraY this engine can handle. Its a 383 stroker with the following parts

Forged Callies Crankshaft, Forged Callies rods, JE forged pistons (11.8:1), Splayed 4 bolt mains with billet caps, CNC ported lt1 heads, 226/236 114 lsa cam...400 rwhp N/A

The motor was built with running N/A a priority, and am unsure what the exact ring gap is, but I'm assuming it is not quite as large it might need to be to spray more than a 150 shot...I would like to make around 650 rwhp, what is needed to make that work reliably? How much spray can a JE forged piston handle with a ring gapped for N/A? What kind of nitrous kit will it take to get me to my goal?

 

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Ring end gap on a performance N/A motor that has a 4.030" bore will be somewhere in the .020" range (top ring). Ring end gap for a nitrous motor with the same bore will be approx. .030" for the top ring...HUGE difference.

If you're making 400rwhp and want 650, the obvious answer is to spray it with a 250hp nitrous kit, but that is a little easier said than done as you will want to ensure the motor can handle this amount of nitrous and you will more than likely need to spray it with a direct port system to be safe about it.

The motor you described appears to have a lot of the correct parts, but the ring end gaps on both the top and second rings will need to be adjusted accordingly. It's not so much a matter of the piston handling the tighter ring gaps as it is the fact they the ring ends can butt together if not properly gapped. The motor is probably safe up to a 150hp shot (although I would certainly check with whoever built the motor first) using a nozzle style kit. After that, you may want to consider a plate system like this one that Nitro Dave's makes: http://www.nitrousoutlet.com/catalog...roduct_id=2807 It is good up to a 200hp shot. After that, you will want to look into a direct port kit. Just as important are all the necessary "safety" items that need to be in place as well. Hope this helps...

 

Yes that does help thanks! See here's the thing...I dont not know the engine builder, but the guy who I'm buying the 383 said the engine builder built it with n/a in mind, knowing the car may see some spray in the future. I believe the builder said no more than a 150 shot...What involved with opening up that ring gap clearance? From the sounds of it, its probably going to be pretty expensive. Obviously the entire engine will need to come out and the short block disassembled completley to get to the rings right?

 

It's not a big deal, and if you do it yourself the only cost involved will be a new gasket set. The front cover, heads, intake and oil pan all have to come off. Then you pull the pistons and rods, remove the top and second rings and check the gaps in the bores. Clearances should be in the .030 range as mentioned earlier. If you can speak to the engines' builder, ask him about the ring end gaps, though I personally wouldn't trust it without verifying it myself. That's just me though, I'm a little paranoid It sounds like the builder may have been aware of the occasional nitrous use slated for this engine, but talking with him will help I would think.