Ok, I already have a set of pistons just like below. I was at CarCustoms looking for Ecotec studs, when I saw what the link below says...

http://www.carcustoms.net/product_info.php?products_id=414&osCsid=e342ac73673a019e728ff58806aab371

"CarCustoms does not recommend using stock bore pistons unless the pistons are installed with brand new sleeves."

Anyone know why this is? I mean, the sleeves are good to 750 HP, which is above what I'll ever have, so why would they say this?

THANKS!!!

It could be that the cylinder sleeves have a taper that would cause an issue with the forged pistons. Forged pistons and cast pistons have different expansion rates so I would guess it has something to do with that.

But this is just a guess.




Semper Fi SAINT. May you rest in peace.

Because you are supposed to clean up the walls when you install new pistons. If you use a stock sized bore piston, then clean the walls .005, your piston rings won't seal correctly.





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How do you clean the walls? And I would need new sleeves plus cleaning my walls to install forged pistons?


http://www.cardomain.com/ride/2208703

with a hone.

We installed my pistons in a very low mile motor without a hone or new sleeves.

I put stock size in my motor and have very good compression even with just honing it. granted i only have like 350 miles on my motor.

im guessing he is doing it to cover his ass

there is to many variable's when putting new stock bore pistons into a used motor


granted you can prob get away with it , but the more miles you start with the fewer youll get in the long run


me personally id bore the motor over and use larger pistons , more cubes the better

I agree with Owen. Talk to a machinist. I bought stock bore Wiseco forged pistons. My sleeves still had the cross hatching in them when I swapped the pistons. As shifted said if you "clean up" the sleeves you might not get a proper seal, and have problems from excessive oil burning or low compression.

However, you can get a hone for a drill, has a plastic shroud on the end, allows you to hone the sleeves with the block in the car, and crank still in. Not the ideal way to do it....

The nice thing about rings is that you are supposed to file the rings for proper end gap, so even if you do "clean up" the sleeves, losing .005 SHOULDN'T cause any problems. You don't lose a lot of material getting a good cross hatching back for a low km motor.

And just to clarify for jackalope..... Depending on the piston, and again just confirm it with Wiseco, they account for the expansion rate of the forged pistons, and they are the proper size for your stock bore.

[quote=97cavie24ls(JDM&00s/c sedans™)]im guessing he is doing it to cover his ass

there is to many variable's when putting new stock bore pistons into a used motor


granted you can prob get away with it , but the more miles you start with the fewer youll get in the long run


me personally id bore the motor over and use larger pistons , more cubes the better


I Completely agree but it saved me tons of moola like $600 because i got the pistons with teh car.

Wow! Great responses guys! Thanks!!!

I have a motor that is on a stand right now, and only had 3,000 miles when pulled from the donor car.

So, in a nutshell, I could do it with no work needed on the motor? I'm gapping the rings of course.

What do you guys think?

THANKS!!!

you can most likely get away with it

if your using new rings , id atleast run a hone down the hole once , so the new rings have something to seat to

Just make sure you check the piston to wall clearance. Stock pistons are 0.0004-0.0016 in, forged pistons will probably be .003 - .00375 depending on the manufacturer.





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Hmm, also the fact that the Wiesco ones are aluminum, thus they expand quicker than the sleeves will...

Looks like I'm honing the sleeves.

THANKS!!! GO JBO!