i’ve been kicking the .040 vs .060 oversized pistons for a while now, the only downside i see is if something happens i’d need a new block…but blocks are cheap these days so is there any other reason to not just go .060 from the start?
if a few CCs more displacement means that much to you go for it
just tryin to do it right the first time it’s all the same price…and a few cc’s more displacement helps spool larger turbos
are you doing that with just the 2.0 block? if your worried about more displacment, just do the stroker or just do the 4G64 bottom end.
then he wouldnt be able to rev to 9579873467398457630467 rpms, silly rabbit those rpms are for hondas 
not worried about anything the prices are the same between sizes just wondering why you wouldnt go the biggest you can
I would rather have a margin of safety that way you can always bore more if need be and don’t have to worry about finding a block
kurt when you over bored a motor you tend to have more heat issues.
if something happens that i need to rebore more than likely i’ll need a new block anyway not worried bout that.
goerge dsm blocks are 2x as thick as a standard block they dissapate heat really well through the cooling passages
mine is 20over no heat issues runs coola s hell when it runs that is
Honestly, your not going to see a big difference. I’ve bored and stroked plenty of motors and you’d be better off staying at .040" over so not to thin the cylinders. Does the block need bored?
stated before boring a dsm block to .060 does not come close to thinning the cylinders
If there is no concern about thinning the cylinders or reusing the block, then what would be the benefit of going 40?
i’m planning .060 just making sure i dind’t miss anything that’s all.
are you going to o-ring? I can’t picture how close the cyl. are on a 4g63, but if you over-bore, o-ringing will be not possible.
i’ve seen .060 dsm motors oringed
then it sounds like you have all the answers?
thin walls - you say no problem
need new block if issue - you said you’d buy one anyway
.60 can’t oring - you say you can.
Heat Issues
we covered that too quik.
Is there a headgasket to fit a .060 overbore?
Overboring helps to unshroud the valves a bit, increases compression (i’m guessing it’d go up about .3 or so), and increases displacement. Not a whole heck of a lot of HP on a 4 cylinder by any means though, since you’re only picking up about 70cc or so going .060. If you’re going to junk the block if it ever needs rebuilt then there really isin’t a whole lot of reason not to go as big as possible.