Crankshaft

[spike123]

Hi guys
If I want to get a crankshaft and there's a few on eBay how do I know what to look for are there numbers on the crank that relate to part numbers
Mark

[Ian C]

What model and year crankcases do you have?

[spike123]

1969

[Nanonevol]

We still don't know the model but online buying can be risky. 
Photos should show threads on the ends, and any balancing done to the flywheel but I would try to find out the size and condition of the big end journals and bearing journals. 

[spike123]

hi
the set of crankcases belong to a 66 spitfire and a set of 70 cases