Do i have any options of stroking my motor that was rebuilt with a .o40" overbore? Or should I just go get a rebuildable block from a junk yard?

 

Stroke it and go 60 over

 

You might beable to over bore it 0.06 over if you have it sonic checked. But you might as well start with a virgin block if you can find one.

 

DO NOT go 60 over unless you have an oldskool block from the 60s/early 70s. 40 over is the most for a newer factory block. Stroke should have no real impact on how far you can bore the block...just don't use the short rods from a 400 if you stroke it. I have a 385, 4.04 x 3.75 and its fine. Use 5.7 or longer rods and don't worry about it.

 

why is it 30, 40 , 60? why not 50?

 

Call around and get quotes for 0.050" oversize pistons and you'll find out.

 

I understand 50 is custom but why don they mass produce them. People would rather go 50 over then 60..

 

Because usually a .03 is required to cleanup the bore and then on the next overbore another .03 over is .06. But sometimes a .04 overbore is required to cleanup a damaged bore.

 

My problem is trying to find .040" over pistons that work in a stroker application. All I can find is .030".

 

There are plenty, you can't just look in a catalog though because they only list the most popular size. You have to look in the piston manufactors you want catalog to find them.