Completely stock block came out of a running 97 LS. Tore motor apart and all the pistons have .8 on them. I came across a block like this awhile back also but i left the block stock so i didnt have to worry. Now i'm wondering wtf does .8 mean. Do i have a regular size 81mm? I know i should just measure it but my mic isnt with me right now.

And yeah just for an example, if its a different bore size, am i suppose to get pistons like these or something? (No way in hell gonna buy them but using them as an example cuz they say 81.08 bore

http://www.amazon.com/Arias-33...otive

 

bump

 

need an answer!!

 

 

why not buy a micrometer. there only like 25-30 bux for a decent one at a parts store.

 

There are certain applications for Arias that come in 81mm, 81.08, and 81.5mm and up.

The reason for the small difference. Is that some consumers, have a decent block that they can still machine and will have the clearance needed to fit in the stock bore block.

If the cylinder walls has been SLIGHTLY scuffed up or something that needs it to be cleaned up a bit but not needing a bigger bore, then thats when they use the 81.08mm

The next size up is the 81.5mm and is mainly used if the cylinders have to be bore out .5mm to clean up any damage to the walls or if it has some deeper wear that cant be cleared by just matching to the 81.08mm

PM or email me at sales@exospeed.com I'll be glad to help you more with your decision. I need to know more info about what you are exactly doing.
We're a big distributor for Arias pistons so I know the choices for your application.

Wil