Whats the difference?, these 7afe pistons(link) Options

[Nemises]

As some of you may know I am working on my 7afte. My question is I found these three auctions on ebay what is the difference between these 7afe pistons? What does the .020"/ .030" and .040" stand for? If I get the one with the biggest bore will lower my compression a little? Stock bore is like 81 I think the biggest one below is 82 is that enough to get a little more air and fuel into my cylinders? Does it even matter? I am getting a set im just curious.


Toyota Celica Corolla 7AFE pistons #P8059C +.020"

Toyota Celica Corolla 7AFE pistons #P8059C +.030"

Toyota Celica Corolla 7AFE pistons #P8059C +.040"

[playr158]

you want to get the pistons with a 81mm bore

any larger and you have to bore your motor

to lower compression, you have to have a custom piston made or a thicker headgasket

so none of those will fit unless you bore the motor

This post has been edited by playr158: May 10, 2005 - 4:21 PM

[Nemises]

you want to get the pistons with a 81mm bore

any larger and you have to bore your motor

to lower compression, you have to have a custom piston made or a thicker headgasket

so none of those will fit unless you bore the motor
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My fault I should have mentioned that. My car burns alot of oil so Im afraid its time for a little rebuild before the turbo. So yeah I am getting my block bored out. I know these are not low comp pistons or anything just stock. I am asking if I go with the biggest bore on one of these stock pistons can I lower my compression a little? Can i fit a tiny more boost?

Basically heres my question. I need new pistons and rings for my 7afe performance wise should i pick one of these pistons over the others (81.5 or 82) Or just get a set and get the thing bored out to match.