well, I have sprayed cast pistons with a 200hp shot numerous times, (402BBC) I used 325hp shot on KB pistons on a 351W I had in a 68 cougar, I have sprayed (estimated) 400 shot on SRP pistons, but I know a thing or two about nitrous, hyper pistons are stronger than most people thing, usualy what kills them is high RPM, I dont suggest even spraying hyper or cast pistons but it has been done, and im sure im not the only person to do this... the key is have plenty of fuel, quality ignition, the "right" heat range with the plugs and I pull the timing from Total timing, so if I had 36 degrees total timing, I subtract say 2 degrees for every 50 hp of nitrous from that...but thats what works for me, trust me, you have a hick up and youll put a hole in those slugs faster than you can say, OH S**T!
The factory ford hyper. pistons are stronger than most think.Ive shot 250hp on them with no failures.Now a K.B. hyper piston is a pile of $#@%.even if you gap them wide like they suggest.Ive seen these fail on horsepower.Hope I could help.
Calypso Ike - just so you know, it's HyperEUTECTIC, not hypertonic; although I like your creativity. Leadsled summed it well - the key is not so much the amount sprayed, but the tune under which it was sprayed. The hypereutectic pistons won't like it if it gets too lean and/or detonation occurs. So the more you spray, the more conservative you should get on your tune (richer).
My buddy sprayed 250 with KB hyper pistons all summer long (he used it ALOT too!!!!) and blew a head gasket towards the end of the season. The pistons didn't have a scratch on them, so, back together it went and more spraying. The engine's in another car now and still running totally fine.
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