Re: 461-x heads
OPly two versions, 461 and 461X all X were 61-62-early '63. 461 was the only version used with 2.02 intake valves. All '461X had 1.94 intake valves as opposed to the 1.75 intakes on the 250hp 327 and earlier smallblock heads. I don't know what you are referring to about a third version. The 2.02 valves were installed in the same casting as the 1.94 valves with the only difference being in the machining of the valve seat and the adjacent chanber area to clearance the larger intake valve.
OPly two versions, 461 and 461X all X were 61-62-early '63. 461 was the only version used with 2.02 intake valves. All '461X had 1.94 intake valves as opposed to the 1.75 intakes on the 250hp 327 and earlier smallblock heads. I don't know what you are referring to about a third version. The 2.02 valves were installed in the same casting as the 1.94 valves with the only difference being in the machining of the valve seat and the adjacent chanber area to clearance the larger intake valve.
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