You and CChang5 make good points. Since I have no plans of boost I should be fine with the 4032 pistons. Could they hold up to stress of road racing? What about nitrous? I'm not decided yet but I'm not ruling out throwing my Zex wet kit with a 50 shot in the car if I'm gonna drag race. Since "weaker" OEM cast pistons can handle moderate nitrous and aren't a major no-no with racing, I don't see why I would be assembling a "ticking time bomb".I agree with that. 4032 is great for street motors and just about any all motor build. The tighter clearances should pay off with better longevity of the piston itself and the rings (they're less exposed). The Mahle pistons are 4032, have coated skirts, and generally one of the best off the shelf 4032 piston makers out there. That's what I would use if I was going to start a new build today.
2618 can take more abuse b/c it has a higher tensile strength. That means when high HP starts pounding the piston, high revs start to stretch the piston, and high heat starts to soften the piston, 2618 has a greater ability to take the load without falling apart in a catastrophic manner. The downside is that the coefficient of thermal expansion is greater meaning you have less consistent skirt profile as temperature varies. This makes it a little bit more tricky to get daily drivable longevity out of a 2618 piston versus a 4032 piston.
I was looking at the Mahle pistons but they only seem to make RSX 86mm pistons. They MAY make 87mm piston, but I can't find them on the internet. Maybe I'll get in touch with their customer service.
Anyone have any experience with the Supertech pistons? They make the 4032 pistons with a 87mm bore and a 12.5:1 c/r. Thay also come with a "'phosphate dry lubricant’ coating to protect the rings against ‘micro-welding’ and enhance lubrication on the skirt/cylinder area."