I am recently boring my cummins, i had a bunch of oil pourin out the blow by, and was wonderin if anyone had any experiences with going .040 over? Is it a good thing or bad thing? I also added in some new arp headstuds for the extra compression.

---AutoMerged DoublePost---

--------------------------------------------------------------------------------

I am recently boring my cummins, i had a bunch of oil pourin out the blow by, and was wonderin if anyone had any experiences with going .040 over? Is it a good thing or bad thing? I also added in some new arp headstuds for the extra compression.

 

I wouldn't go .040 over if you don't have to! This will not increase your compression! Just your displacement. Not sure how that will affect your cooling system as far as being thinner in the cylinder to water jacket area. You may only need a hone with new rings. Did you already tear it apart?

 

ok thank you. and yes i already tore it apart and the machine shop already bored it with the new mahle pistons. it had to go .040 over. i didnt want to but it was pretty bad.

---AutoMerged DoublePost---

how much power am i going to get by jus boreing it

 

well when you get it done throw up some numbers on it and how much it has changed. whats the new displacement on it now? some were around 6.5 or 6.7? im not to good with math like that.