as per title; how much taller is the 1275 than a 998/1100?
I am in the process of making a weber box for my Moke, and need to start dimensioning up some things.

only about 1/4 inch,,, shouldn`t be an issue with the weber box as most weber manifolds lift up away from the head quite a fair bit

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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.

Excellent.
6mm should be neither here nor there.
I am running a GR 5" (or is it 7, I forget.... - anyway his normal road one) manifold, so will need to relieve the firewall to suit.
Going to be running 'socks' over ramtubes.

I've actually measured it at 3/8" on a few un-machined blocks.

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Me too.

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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.