[alfa] Spider Head Differences

["Roger Hambro" <rhambro@xxxxxxxxxxx>]

In comparing a remanufactured head I just purchased to my original '78
Spider head I noticed that my original '78 head has large approx, 1" x 1/4"
oval oil drain passages cast into the oil pool area between each pair of cam
followers whereas the reman. head does not.

It would appear that the passage would allow oil to drain back into the
engine after the oil in the cam follower oil pool area rises to the level of
the cam cover gasket.  The reman. head does not have these passages, so oil
returns to the engine by traveling a longer path around the front and rear
camshaft caps.

Anyone know why these differences exist?  Which came first?  Does it really
matter?

Roger Hambro
'78 Spider
Algonquin, IL
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