Hi All,
First post under this account, but a returning member that couldn’t remember my old name, password or email.
Looking to build a fast 1275 and saw this block here https://i.ebayimg.com/00/s/MTE5NlgxNjAw ... Y/$_20.JPG Bored to 1380.
I used to have a 1380 years ago, but don’t remember the walls looking that thin. Particularly between 2 and 3.
What do you think? Does it look right?

Yep. Unless you go for offset bored then it does get thin between 2 and 3.

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Too many cars, and too little time.

when offsetting the bores (properly) you would be making the meat between the bores (on all of them) thicker than they would be without off-setting

we pull the outer 2x cyls (1 & 4 ) .020" to .025" outwards,,, & the inner 2x cyls (2 & 3) .015 outwards (away from the center)

we have 160thou (roughly) oversize bored engines here been running fine for literally years n years n years, one with an 86mm stroke crank & 74.7mm bore =(1510cc) & another with a 91mm stroke crank & 74.5mm bore (1590cc)

so the "usual" 1380 is only 73.5mm bore & ours are 74.7mm & 74.5mm respectively & yes there is not much meat between the bore on these things but we havn`t had any dramas (so-far, crossing fingers )

easy-peasy

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.