Super Jet A couple simple engine rebuild Q's

[skithis]

I have a few quick questions before I rebuild my top end.

-Does anybody have a pic of how much I should chamfer my ports?

-My 61x is getting bored over to 82mm. I will be running a stock head for a few weeks until winter sets in. Will the stock head be ok with a cylinder that is 1mm over?

 

[augustaf]

Chamfering is needed so the rings don't catch. Just a small amount like one mm (.040") will do. Your stock head will be ok for 82mm.