Re: 1966 327/275 cyl head cc
 

I have been told that all the X castings were built from core boxes that were marked X because they were out of spec and were to be destroyed.
Apparently the upper part of the mold on the long side by the valve guide was built big or worn out of spec. Most of the X heads I have handled since the mid to late 60's( passed through my shop) were in the 10 CC bigger range. If you do a mold of the original ports it is very apparent where the extra CC's are. They are still sought after by Dirt track customers.

Re: 1966 327/275 cyl head cc
 

I have a set of 462's with 1.94 1.50 valves that flow better than that.

Re: 1966 327/275 cyl head cc
 

What are your typical 462, 461, 041 heads worth these days? Anybody buy/sell these things lately?

Re: 1966 327/275 cyl head cc
 

461 heads are only legal on pre-67 cars. That narrows their applicability. 462 heads are legal all the way back to '62 327's. They came out in '67 and 68. The 041 head came out in 69 and 70 only. There were probably more of those made than 462's. It's legal to use the 041 head on '62 on up 327's in place of the 461-462 head.
As with anything else, condition dictates value. A set of castings that have never been apart are definitely worth more than a head the has gone to too many parts store back room valve jobs. Also, some back yard port jobs rendered a lot of heads useless in their aftermath as far as their future legality.
A very nice set of 462 or 041 heads could be worth up to $350-400, that is one with original guides, valve seats, deck surfaces, no overheat damage, and untouched ports. That gives a good cylinder head guy a good place to start. The worn out stuff could go to those building a bracket car or a cruise night special rather than a legal car. It would seem like a waste to sell very nice original castings to somebody to use to go ruckety-rump through the drive ins with.
One thing about heads, blocks,and intakes, all this stuff made prior to the '70 model year, when many of us were in high school, is all 50 years old now. Seems hard to believe, but it's true. When we were in school and all this stuff came out new, a 50 year old car was a Model T.
Used cores that are serviceable should be worth around $100 on up.