It's not a 302, so what pistons do i have?

Marlboro_Man · Oct 10, 2006

Well i got the heads off tonight, and the first thing i noticed is the pistons say .030 right in the middle.

I go check my spare block which is a stock 89 block and the pistons say ford on them.

Bust out the dial caliper and sure enough the cylender bore is 4.030 .

The pistons do not say anything other than ".030" on them, but they look just like the pistons in my stock short block other then that.

Anybody have any clue what pistons these are?

Is there anyway to tell if they're forged or hyperU-CRAPPED-IT???

Pics of the mystery 306 pistons.
View attachment 434214
View attachment 434216
View attachment 434218

Oh and whats the best way to clean these pups? Or is it not even worth doing?

Roland69 · Oct 10, 2006

Marlboro_Man · Oct 10, 2006

Roland69 said:
306

Thank you captain obvious

I know it's a 306, didn't know that before i pulled the heads though.

What i'm wondering is what brand/type they are. Forged or hyper, if it's even possible to tell without pulling them out of the block and having them sent to some crazy smart metalurgist type place.

stang8urimport · Oct 11, 2006

Roland69 said:
306

Best tech of the year!

They look sorta like TRW pistons with the stock type 4 reliefs. take the pistons out and see if you can find a part number... Then Rick91GT can probably tell you more about them.

Marlboro_Man · Oct 11, 2006

PoopDawg said:
Best tech of the year!

They look sorta like TRW pistons with the stock type 4 reliefs. take the pistons out and see if you can find a part number... Then Rick91GT can probably tell you more about them.

I I I , this was supposed to be a simple headswap.

Don't wanna take the pistons out, even if thats the only way to know for sure. It's just out of the budget right now.

I've spent $3000 in the last two months, just on my car.
If my wife knew that.....well lets just say she would be pissed lol.

jrichker · Oct 11, 2006

Marlboro_Man said:
I I I , this was supposed to be a simple headswap.

Don't wanna take the pistons out, even if thats the only way to know for sure. It's just out of the budget right now.

I've spent $3000 in the last two months, just on my car.
If my wife knew that.....well lets just say she would be pissed lol.

If she did, the "I love Marlboro Man" sign might say something else....

88Stang331 · Oct 11, 2006

jrichker said:
If she did, the "I love Marlboro Man" sign might say something else....

Or she might be doing something else besides holding a sign that says "I love marlboro man" But if she asks you can't lie about it...tell her you needed to get your car to run so you can get to work.

Modular2v · Oct 11, 2006

the real question now is. . . . how do you know the rods and crank are stock? You might have a 331 or 347 on your hands and not know it

blkcobra50 · Oct 11, 2006

a lot of times ID ing pistons requires looking underneath in the wrist pin area. TRW pistons a stamped underneath with the part #, at least the ones I've seen are.

Marlboro_Man · Oct 11, 2006

Modular2v said:
the real question now is. . . . how do you know the rods and crank are stock? You might have a 331 or 347 on your hands and not know it

I guess i don't. If it's stroked it sure was a slow stroker.

The car had a S/C on it at one time. I know because the oil pan is tapped, boost gauge inside, mounts under the hatch for an external pump, ect ect. Now i find out it's a 306.

I wonder what the cc is on the pistons. They don't look like low compression pistons do they?

jrichker said:
If she did, the "I love Marlboro Man" sign might say something else....

yeah more like

86bluecobra · Oct 11, 2006

if it was a s/c engine i bet the guy bought forged.

86bluecobra · Oct 11, 2006

your pistons look like these to me.
http://store.summitracing.com/partd...908331+4294840126+4294891096+115&autoview=sku

Modular2v · Oct 11, 2006

no! those are not low compression pistons, they are flat tops

sgarlic · Oct 11, 2006

You could always threaten one of the pistons until it gives up the info.. or you could hit one with a hammer really hard.. if it shatters, its hyper.. if not, probably forged..

5ive.oh · Oct 11, 2006

z2o_what · Oct 11, 2006

pull the oil pan off and use a flash-lite to see if you can see a part number inside the piston

Marlboro_Man · Oct 12, 2006

z2o_what said:
pull the oil pan off and use a flash-lite to see if you can see a part number inside the piston

I tried using my extendable mirror and flashlight through the cam hole but i couldn't find any numbers or letters under them.

Modular2v said:
no! those are not low compression pistons, they are flat tops

I thought Flat tops had no reliefs? Hence the name...

After looking at the summit link 86bluecobra posted it says they are Dish pistons.

86bluecobra said:
if it was a s/c engine i bet the guy bought forged.

Thats what i'm thinking/hoping. Well forged or hypers they've liked the 100 shot so far

sgarlic said:
You could always threaten one of the pistons until it gives up the info.. or you could hit one with a hammer really hard.. if it shatters, its hyper.. if not, probably forged..

Last night i had a spotlight pointed at it and my .380 in my hand and they still wouldn't talk.

Maybe i'll try the hammer tommorow.....

86bluecobra said:
your pistons look like these to me.
http://store.summitracing.com/partd...908331+4294840126+4294891096+115&autoview=sku

Yes they do look like those. Except the ones in my block don't have any markings on top like those appear to. The only marking mine have is .030

Roland69 · Oct 12, 2006

Marlboro_Man said:
Thank you captain obvious

that's Corporal Tangnet......sir

FobraR · Oct 13, 2006

from those pics, it looks to be hypers. of all the pistons ive seen, forged slugs usually dont sit that tight in the bore because they expand more under heat. but then again, pictures are deceiving. get a part# to be sure. just my .02

MikeC · Oct 13, 2006

They definatly have a small dish in the center.

It's not a 302, so what pistons do i have?

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