Biggest Bore w/ 420a Block

[DSMOCTANE]

-I am currently in the process of rebuilding my entire 420a block and was curious to what the safest bore would be to go over with comfort. Would going .020 over require a fuel and ecu upgrade as well?

 

[eclipse420ags]

No that should be fine there is.040 over for our cars to I think its wiseco pistons.

 

[bullettdsm]

You could go as much as .060 if you wanted to. At .020 you'll be fine.

MB