Hi Looking for 2 for my bsa m21 with the long alloy spacer.
I had the same problem and ended up making my own :(
If you don't find a supplier of ready made studs you can try Middleton stainless, they will make them to your measurements.
https://www.stainlessmiddleton.co.uk/34339-studs
I've used AcmeStainless many times and have been very satisfied. They'll make exactly what you want.
Thanks will give them a try. What thread should I be ordering.
I've little experience with M21s but Drags list 1949-58 M series studs as 66-9250 which are 1 1/4x5/16 BCy both ends. But there's also the possibility of 29-0565 which is 1 3/8x5/16 BCy one end and Whit the other. Do you have an old one to compare or can you check the manifold threads?
Hi Greenfield . No studs to compare with my m21 is a 1961 if that makes a difference.
Do you have 5/16" BCy and Whit bolts or taps that you can use to check the manifold threads? Once you know the thread at the engine end, you can then order the length you need from Acme for instance, taking into account tufnel spacer and gaskets etc, with a BCy or similar at the other end to take the nuts.
Thanks I think I have found them on Draganflys site. ;D