micus

hey guys, i was wondering if i could snag some pistons out of a 91 ( since i hear there forged ) and put them in my 84 mustang, has anyone done this? i mean a 302 is a 302 rite?

primetime5.0

yep

boss429

and they were forged in more than just 91's i think it was like 87-92 or something
i know they arent in 93's
someone corrent me with when they started putting them in?

mrbigshot

the pistons will work (if the old 302 is is good shape still) just rember they are metric rings. just one question for you? why in the world do you want to swap pistons? if you have that 84 302 checked out it will probably need machine work so the pistons wont work. you can get a better set of forged flat tops from summit with rings for $263.

if you do switch the pistons out go ahead and change to the heads the ones that came of the 91, it will bump up the compression and make a lot more hp. with a mild cam and little better intake that 84 could do 200-230 hp at the crank (factory 1984 h.o 302 is 175hp)

Twister

um, it's 85-92 that were fordged

PX429

your going to reuse old pistons???????


and twist it's 89-92

Twister

no, in 85, it was the first roller block, first headers, and the first forged pistons since 1973 in a Stang, the orrigional slugs in my 86 were forged


http://www.mustanggt.org/85gt.htm

88stangaruu

you know if you try to use those pistons in your motor...its most likely gonna need an overbore, those forged slugs are gonna be under sized...your going to have some mad piston slap and blow by problems...just order some TRW 0.30 over forged pistons.

Twister

I would always use new pistons, but for some strange reason, people on this site do not like to spend money and do things right

HACKGT350

twister ihave noticed that as well...i dunno what it is with some people on here. i only get new and the best for my car i wanna do it right the first time