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They take the peanut plugs like on the chebbys.

Ok, it just accured to me (but i could be wrong), has anyone looked over there peanut plug 400/440 heads to see if they have these nipples, I'm starting to thing "maybe" they put them there so people would not try to install the old 13/16 plug & have it blow out, its just a thought, but it could be a steam passage.





Never thought of it like that , I thought the thread size of the plug was different but I guess all the plugs are 14mm , except for some fords tha twere 18mm.

Lee , thanks for putting up those pictures , I thought there was a marking that was different between the 2 as an identifier?

scratchy , that plug is 1/8-27NPT , one of the heads I had had that same plug , the other head was NOS. I got them from Paul Rossi back in the 80's , they had big valves and were ported some.