The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: mike68 on 16.02. 2015 22:00

Title: a7ss head on a10
Post by: mike68 on 16.02. 2015 22:00
Looking for some advice if i can put a a7ss on my a10 which has a alloy head with the number 67-1571,the problem is this head is in a bad state with broken fins and it has had a poor weld/repair near the rh inlet valve spring and i have a bare head in good condition with 67-1122 which i believe is a a7ss head but this one has had the combustion chamber made bigger in diameter taking the step out by the gasket face to i would imagine fit a a10 at some stage and the valves seem to be the same size as the 67-1571.i have ordered 8.25 cr piston at 080" cheers mike
Title: a7ss head on a10
Post by: mike68 on 16.02. 2015 22:08
Looking for some advice if i can put a a7ss on my a10 which has a alloy head with the number 67-1571,the problem is this head is in a bad state with broken fins and it has had a poor weld/repair near the rh inlet valve spring and i have a bare head in good condition with 67-1122 which i believe is a a7ss head but this one has had the combustion chamber made bigger in diameter taking the step out by the gasket face to i would imagine fit a a10 at some stage and the valves seem to be the same size as the 67-1571.i have ordered 8.25 cr piston at 080" cheers mike
Title: Re: a7ss head on a10
Post by: metalflake11 on 16.02. 2015 23:44
Ran mine likes that for donkeys years, no issues.
Title: Re: a7ss head on a10
Post by: wardleybob on 17.02. 2015 07:08
Done that a couple of times it works well.It gives you a good squish . Not to sure on what compression I used though.
Title: Re: a7ss head on a10
Post by: muskrat on 17.02. 2015 08:47
Go for it Mike. That's exactly what I have on the cafe (but higher 10.5:1 pistons).
Cheers
Title: Re: a7ss head on a10
Post by: Rocket Racer on 23.02. 2015 07:14
Go for it Mike. That's exactly what I have on the cafe (but higher 10.5:1 pistons).
Cheers

Ditto,
 my sidecars head was originally an A7ss one. The A7SS heads are typically less knocked around than the A10 Alloy ones