Came across a guy that may want to sell a 1275 block. it has main caps, 12YTaH#### and 70.5mm bores.
From what I can tell it's a 1100 S block but if you guys can provide some more info I'd appreciate it.
Also what cc is 70.5mm? and mostly what's it worth?

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Respect mine and I'll respect yours.

std bore , with a tiny bit of wear by the sounds of it

worth--> probly $400-ish

depending if you think 1275 blocks are getting hard to get or not
for some reason there are people out there who reckon they`re not worth more than $200, but i beg to differ... If i had hundreds of them then yeah $200 would be fair
but i don`t want to sell any of the ones that i have because i don`t have hundreds of em

so,,, $400 plus is what they`re worth if everything is peachy

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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.

yeah I was thinking 300 to 400. It is a thin flange block isn't it?

I've posted as much as I know about the block, I'm 99% sure it's a 1100S block but I don't know if it was originally a large or small journal or what .

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Respect mine and I'll respect yours.

Doesn't matter which, both these blocks are good. They take either type crank. Or an S crank (with thrust washers thinned down, like mine).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.