[lukecp]

You are right.....041's do also have accessory holes. Any head made after 1969 should have them. I am pretty sure Mortec.com listed 041 as a double hump head...even if they dont have the 2 humps on the end of the casting, they still are a 64cc closed chamber head, and some came with factory 2.02/1.60 valves.

461X heads are proably the rarest and most potent double hump head made....the intake runners are 10cc's larger than the standard 461 head...up from 150-something to 160-something i think. I dunno what they are worth though.......