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A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 11:46 am
by jbz23
Hi, can you fit an A series std 1275 crank into a cooper s block? If so what mods are needed? Many thanks
Re: A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 4:41 pm
by In the shed
I think the mains are the same. A problem could be that you'd have a 970/1071 "short" block, when you require a 1275 Tall Block. Personally, I'd sell the S block to some clown on the internet for 100s of pounds and then get an S crank and put it in a non-S block. Thus having all the benefits of an S engine bombproof bottom end. The blocks are much of a muchness.
Re: A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 4:44 pm
by rich@minispares.com
you just have to use the correct thrusts
Re: A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 6:57 pm
by 251 ENG
You have to grind down +30 thrust to fit .
The normally end up about 0.010" to 0.015" oversize depending if the crank has been re-ground
Re: A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 6:59 pm
by Spider
rich@minispares.com wrote:you just have to use the correct thrusts
and later Big Journal Rods
Re: A series crank fit in 1275 s Aeg 312 block
Posted: Wed Nov 05, 2014 7:16 pm
by jbz23
thanks for all the info guys, very very helpful. cheers