Cylinder head

[Gordonh]

Hi all,been offered a twin carb head for my 66 A65 Hornet,it has a casting number 68-701B,would this fit,I have asked before but this is a different casting number.Thanks Gordon.

[Nanonevol]

If original, I believe your cylinder will need 5/16" bolts for the 2 rear and the rest 3/8".  They all became 3/8" after 1968.
Many older heads may have been drilled out to 3/8" for use on later cylinders so you'll have to check it out.
I've seen that casting number on a head with all 3/8" bolts.