z28beast

ok so on the top of my pistons its sais .030....does that mean there 30 over

ACE1252

Yes sir, you got it!

JakeRobb

Ace, are you sure that's not a 30cc (0.030L) dish/dome?

Seems weird that a piston would be marked with the amount that the bore is over some arbitrary amount that only applies to certain engines.

z28beast

[edit]

dangalla

pistons are always marked with overbore that way, at least that is what i was taught in school and i have never seen one that wasnt

did you order the wrong pistons or the wrong rings. because this is completely inconsistent with your other threads about this motor, i think you may be seriously confused about this whole building a motor process and you may want to calm down and ask a few questions before you go ordering any more parts

bombebomb

Not sure if that is the case or not, I forget what marking my pistons had on them. It would seem silly to me for someone to mark a piston that could be.030 anything as .030 but I have no idea.

dangalla

i am sorry, but i really do not understand what you are trying to say.

z28beast

no i ordered the rings! only the rings but there for a stock 4.00 bore

dangalla

ok, so what happened is when you opened up your motor you found the marking of .030 and you now need to order rings to match that?

z28beast

im guessing so...i can exchange them but im just impatient as hell! and im not even sure if the pistons are 30 over or not

bombebomb

Sorry retry

Why not mark it as 4.030, otherwise for all we know it could be 3.030, or anything for that matter. The marking just seems a little vague to me.

z28beast

o well [edit] it...ill have my buddy mic them in the am

ACE1252

If you look very closely you will see .030, on the top of the pistons, on the front cover of this book(hard to see I know...use the zoom at the top of the cover). If I recall, the motor in this book was bored .030 over. That is where I've seen it before.

http://www.amazon.com/Rebuild-Small-...der_1557883939

dangalla

the number indicates the difference from stock

and yes you should be measuring everything anyway, but if the piston says .030 on it then there is an overbore of .030

shoebox

...because it is assumed that you know the engine (stock specs) that you are looking at (an LT1 isn't going to have a 3.000 bore) and the marking is the deviation from stock size. Pistons and bearings have always been marked this way. If was too confusing for folks, I think they would have changed it by now.