300hp is cake for any CB, 2.2 or 2.5 and any of the cranks as well. (unless your thinking of reving to 8000rpm, then you'd want the forged crank for sure :))
Wether you go with the stock Mahle's and just monitor your tune well or go Forged pistons is up to you and what your willing to spend for the piece of mind. As others have stated, I would stay away from any of the other "non-forged" A/M pistons.
Most failures have nothing to do with block limitations, usually bad tune, bad maintenance or just a not so well thought out build.
Yep. I've had cast pistons survive dozens of 1/8 mile passes at 28psi. The only time they broke was when I had serious engine malfunctions like leaving the boost controller off (oops) or the hep sensor or electrical system having big problems and cutting out fuel under boost (that was only 15 psi but it still cracked the piston..should have paid attention to the 30 minutes of backfiring lol).
My record for swapping a cracked piston for a new one is 16 hours. I'm sure some people on here can do it even faster than that, its really easy on the 2.5 CB in a 90 daytona, not sure about the other cars. If you are modifying your engine there is no excuse to be throwing forged pistons into the mix but simultaneously not knowing how to swap out a cracked piston yourself. I did the 16 hour swap when I was renting a room and had a single garage space to work in. Its doable even on the street if you have a plan.
I really dont understand the desire to modify old beat up cars like this for insane power but then live in fear that the engine will break and you'll have to shell out money to a mechanic. Doesn't that take all the fun out of this?
If you are counting on forged pistons to save your butt, you arent learning enough about how your engine works to be in control of the situation yet.
On the other hand, I only have one more 0.030" over mahle piston. Once thats gone, I might be forced to get forged pistons because thats all thats still for sale and oversize I think. Forged might be the way to go simply so you have a source for replacements if needed.