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Mr. 5.0 - You do not need factory forged pistons, that come in the '87-midlate '92s.
Not all forged pistons are created equal.
A hypereuatic piston will outlast the factory block and rods, if the tune is right.
To the original poster:
I wouldn't push more than 8psi with old stock headgaskets. Get a very safe tune or you will be swapping headgaskets.
Preferrably, replacing the headgaskets with a better pair, and some ARP head studs for better clamping force would be preferred.
Get a bigger MAF, because you need a new one anyways since you will need to go with bigger injectors, fuel pump.
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1993 5.0L and 1998 4.6L.
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