Stock 4g63 piston size!

First off, Rule #7, use your Shift key please.

Second, after a 10 second search.

Ok here is the complete rundown....

4g63 pistons - 85mm or 3.346457in bore

4g64 pistons - 86.5mm or 3.405512in bore

if you take the two numbers and subtract you have
** 0.059055in or 1.499997mm diffrence **

-- anyone could have figured that out... if im correct i think there has to be a 0.006 side skirt clearance for the rings.....
-- So if you wanted to bore your block the least possible then here is what youd need to add....

-- 3.405512 + 0.006 = 3.411512
or for mm
-- 86.5 + 0.1524 = 86.6524

***That would be the block bore minimum ***

-- If you just wanted to get away with honing the block you'd do this method.... we call it subtraction

-- 3.405512 - 0.006 = 3.399512
or for mm
-- 86.5 - 0.1524 = 86.3476

There is the specs again of your bore if you wanted to try and get away with honing the block

So if you are doing the swap... i hope those specs are right.....

-- Another reason i mentioned the 4g63 piston size is because of this... i previously stated you could use 4g63 internals..... you still can but here is the catch....

-- that diffrence of 0.059055in or 1.499997mm.... add to the size of the 4g63 specs....

-- 3.346457in + .059055 -.006 = 3.399512
Now subtract that number from 3.346457
... must i do everything for yall 3.399512 - 3.346457 = 0.053055

That means you will need a .053055 (1.347597mm) oversized 4g63 piston to fit and work in the 4g64.....
-- Might as well get a .060 (1.524mm) over 4g63 piston... probably be cheaper than buying a 4g64 piston.


** If anything i have stated is wrong please correct me **