In a message dated 96-05-20 19:36:23 EDT, you write:
> What are the diferences 
>between the V heads, and the earlier heads. I have two, one has tubes 
>around the plugs, and the other doesn't, I am assuming the one with tubes 
>is a V head. Is there any other difference? 
The one without "tubes" is probably from a very late Series V.  I assume the
one without tubes has more of a pocket-shaped recess around the plugs. 
The valves are slightly smaller on the 1592 head.  There should also be a
water fitting at the back end of the the 1592 head.  A pipe connects this to
the dual Zenith manifold.  On the 1725cc the water fitting is blanked off or
plugged.
A few part numbers you may find stamped on the heads:
1592cc:  5220474  or  5220609 or  5220806
1725cc:   5220955  or  5220968 
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