do stock 5.0's have forged pistons or not?

notch88 · Feb 20, 2006

ok ive always been told and read that certain years of the 5.0's such as like 89-92 came with stock trw forged pistons out of the factory now is this true or not i just bought a bone stock 91 gt roller motor im fixing to put in my 90 notch and i thought it would have the trw forged pistons outta the factory but my buddy was telling me none of the 5.0's had stock forged pistons he says they were all hyperetic ??
can someone fill me in the truth im kinda confused here.
thanks,
Tyler

Roland69 · Feb 20, 2006

I think thet did untill 91 or 92 someone correct me if im wrong.

luckythirteen13 · Feb 20, 2006

92 was the last year, they in 93 they went hyper pistons

Saleen0679 · Feb 20, 2006

The H.O. motor had forged pistons from 85-92. Non-H.O. motors were sand cast. Hypereutectics show up in 93.

8950HO · Feb 20, 2006

I`m pretty sure all of the 5.0L Mustangs from 85-92 came with forged pistons,they they used the hyper ones in 93 and I think hyper in the 94-95,5.0L`s.

HISSIN50 · Feb 20, 2006

Starting in late '92 is when the switch to hypereutectic pistons was reportedly made. Before that, aero foxes had forged slugs.

The old quick and dirty visual test is if the motor has the original and unmolested oil pan, if it is grey in color, that suggests forged slugs. If the pan is black, that suggests hypers.

Good luck.

ninety1gt · Feb 20, 2006

notch88 said:
ok ive always been told and read that certain years of the 5.0's such as like 89-92 came with stock trw forged pistons out of the factory now is this true or not i just bought a bone stock 91 gt roller motor im fixing to put in my 90 notch and i thought it would have the trw forged pistons outta the factory but my buddy was telling me none of the 5.0's had stock forged pistons he says they were all hyperetic ??
can someone fill me in the truth im kinda confused here.
thanks,
Tyler

i think only 88's came with forged, all the others are hyperetic

notch88 · Feb 20, 2006

so my motor would have the forged pistons then right?

Roland69 · Feb 20, 2006

I've heard the statement HISSIN made before somewhere so I would go with that plus he is one of the smartest guys on stangnet. He is like a online owners manual LOL.

8950HO · Feb 20, 2006

notch88 said:
so my motor would have the forged pistons then right?

If the motor is a 91`5.0L,GT motor the pistons are forged.The only way they wouldn`t be is if someone maybe rebuilt the motor somewhere along the line and threw in cast pistons,or if someone pulled a scam and sold you a 5.0L base engine with a 5.0L HO intake bolted on it..
Did you see the car it came out of?
If it`s an original 91`5.0L,GT motor the pistons are forged.

The engine ID decal is probably long gone.

srothfuss · Feb 20, 2006

No motor with over 250 ft/lbs. of torque can have forged pistons. Becuase of the ludacris amount of pressures exerted by the 5.0L motors, you can actually squeeze out the piston fluid (aluminum oxide) from the tops of the pistons. This fluid then causes the air / fuel mixture to lean out and utimately leads to blown motors. Again, this is when you use forged pistons on the 5.0L's. The best way around this is to use the stronger (but more brittle) Hyperutectic pistons that are cheaper and easier to produce. Since they are more brittle there is no piston fluid that can be extracted during hard acceleration runs in the Mustang which means that you won't blow up your car.... Of course if you believe this, than I am going back to Hawaii!

www.mustanggt.org will tell you everything you need to know.

89white50 · Feb 20, 2006

1987-92 1/2 5.0 HO's had forged aluminum. end of story

86bluecobra · Feb 20, 2006

HISSIN50 said:
Starting in late '92 is when the switch to hypereutectic pistons was reportedly made. Before that, aero foxes had forged slugs.

The old quick and dirty visual test is if the motor has the original and unmolested oil pan, if it is grey in color, that suggests forged slugs. If the pan is black, that suggests hypers.

Good luck.

times 2

rockyracoon · Feb 20, 2006

ditto,the reason that ford went to the hypers in 93 was because of complaints of piston slap,the blocks were also
made with an unusually high nickel content which was supposed to reduce bore wear and taper.

frcefedlx · Feb 20, 2006

My 93 has a gray oil pan(It was built in September of 92)

Shakerhood · Feb 20, 2006

frcefedlx said:
My 93 has a gray oil pan(It was built in September of 92)

HISSIN is right on with what he said, the color of the pan is not completely foolproof, but is a general rule of thumb. You could have a freak of nature 93 that used an engine that came out of back stock or if you are not the original owner the engine may have been swapped out before you got it. Hot Rod Magazine has a good article where they had a 5.0 on the dyno and it had those weak Hypers in it and the piston shattered like glass, the were pieces of it everywhere!

onefstsnake · Feb 20, 2006

I believe the reason Ford went to Hyper. pistons was because the Hyper. pistons have a higher Silicon content and do not expand/contract as much as Forged Pistons. thus allowing for tighter ring tollerances and less blowby.

But you get the drawback... They suck.

Shakerhood · Feb 20, 2006

onefstsnake said:
I believe the reason Ford went to Hyper. pistons was because the Hyper. pistons have a higher Silicon content and do not expand/contract as much as Forged Pistons. thus allowing for tighter ring tollerances and less blowby.

But you get the drawback... They suck.

Plus with any Company they are looking to cut costs at any possible time. Hypers are dirt Cheap, Forged are expensive, the been counters see dollar signs and say put the cheapest thing in the engine you can find.

Shakerhood · Feb 21, 2006

onefstsnake said:
I believe the reason Ford went to Hyper. pistons was because the Hyper. pistons have a higher Silicon content and do not expand/contract as much as Forged Pistons. thus allowing for tighter ring tollerances and less blowby.

But you get the drawback... They suck.

In the Hot Rod Article they said another one of the downsides of the Hypers is if the bore tolerance is too tight the piston will just stick and the connecting Rod will just rip the bottom of the piston right off.

onefstsnake · Feb 21, 2006

Shakerhood said:
In the Hot Rod Article they said another one of the downsides of the Hypers is if the bore tolerance is too tight the piston will just stick and the connecting Rod will just rip the bottom of the piston right off.

Lovely.

Cant wait to build a new motor... Maybe in a few years.

do stock 5.0's have forged pistons or not?

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