Shop manual shows main journal specs of a 383 at 2.6245”-2.6255”.

I measured mine at the following (two axis):

#1
2.6243”
2.6242”

#2
2.6236”
2.6238”

#3
2.6238”
2.6237”

#4
2.6241”
2.6241”

#5
2.6241”
2.6240”

So I’m out of tolerance (.0009" under) but I believe I’ve heard that I can buy .001” under main bearings, is that correct? If so, it should put my oil clearance within specs, correct?

This engine will be a stock build and will rarely, if ever, see anything over 4500 rpms.