3400 pistons

[montess408]

i am looking for a set of pistons for my 3400 and i am looking for a .060 over and
every book i look in to it's metric so does anybody know what the size of the
piston i am looking for ?

thanks

[bszopi]

You are looking for a 1.5mm oversized piston. Stock bore for a 3400 is 92mm, therefore you want 93.5mm pistons.

[montess408]

thanks man i am not to good with this metric stuff i was going by the old system
and messuring 3.620 and then with the .060 over bore it's 3.680
but thanks again
so do most piston companey's have this size off the shelf ? i am looking for a set of hypertec camaro pistons

[bszopi]

Yes, they should for a standard overbore like that. Look for Sealed Power, and I know many people have used them in the past with good success.

[923.4v6]

try www.summitracing.com they have them

[torq455]

why are you going .060 over? i hope you're not looking for more power. i didn't think our motors could take a .060 cut.

[ForcedFirebird]

thanks man i am not to good with this metric stuff i was going by the old system
and messuring 3.620 and then with the .060 over bore it's 3.680
but thanks again
so do most piston companey's have this size off the shelf ? i am looking for a set of hypertec camaro pistons

Here's an easy way to convert from metric to standard measurements (accurate to about .004" or .1mm):

mm to inches, you multiply the number by 26.4

inches to mm, you multiply by 26.4.

Example, we all know that a 10mm and 3/8's (.375") wrench are interchangable. 10mm/26.4=.37878..." and .0375"x26.4=9.9mm

why are you going .060 over? i hope you're not looking for more power. i didn't think our motors could take a .060 cut.

Not sure about the 3.4, but there's a guy on TGO with a .080" overbore on a 3.1 (basically it's just shy of a 3.4).

[torq455]

actually it's 25.4. there are 2.54 centimeters in one inch, or 25.4 mm.

wow! .080, that's pretty big. every block has it's limit on overbore. that much surprises me.

[ForcedFirebird]

actually it's 25.4. there are 2.54 centimeters in one inch, or 25.4 mm.

You're absolutely correct, it's too late.

I was thinking that 10mm=3/8's of an inch and actually went back and edited the post. .393 is 10mm, but that's only 5 thousands on a side when using a wrench.

Need some sleep.

[Wiz85]

So Sealed Power makes some, I also heard that Arias does and TRW. Anyone else? But not just for the 3400, other 3x00's as well.

[IsaacHayes]

Not only is it 25.4 but you divide when going mm to inches, and multiple when going inches to mm. LOL

[ForcedFirebird]

Not only is it 25.4 but you divide when going mm to inches, and multiple when going inches to mm. LOL

Haha.

Good thing you guys are on your toes, I'm not.


Sleep.....I..am...sleeep....

[montess408]

i thought that .060 was safe for any pretty much any block really
and i heard of 3.1 blocks being bored out .100 and holding up !

[Wiz85]

Yeah I have wondered the same thing about 3100s? I know that 3400s are like .120" bigger in bore, so did GM just bore out the 3100 blocks or did they resize the cylinders and wall thickness in the 3400 blocks?

[ForcedFirebird]

Yeah I have wondered the same thing about 3100s? I know that 3400s are like .120" bigger in bore, so did GM just bore out the 3100 blocks or did they resize the cylinders and wall thickness in the 3400 blocks?

Cyl were re-sized. Not all blocks can be bored that big, you have to sonic test or x-ray to see if there is enough material.

It is less expensive to just use a 3400 block.