1966 327/275 cyl head cc

Jim Hawkins · 11-30-2019, 01:04 AM

Looking at the cylinder head cc the 461x is listed as 172cc intake and 64cc exhaust. All others are 165cc and 65cc. But then there is a note that says port volumes based on "X" head. Does this mean for example a 041 head can be 172cc intake port?
Also what is the best intake to use? I have a 3875954.

kansas stocker · 11-30-2019, 11:47 AM

The only 461x heads that I have seen came off of vette engines. They all had 2.02 intakes and 1.60 exhausts. The chamber is slightly different from the 461, supplying extra clearance around the valves. Looks like it would be a huge advantage on the 275 hp engine if you replace the seats to use the smaller valves. Pete

Dwight Southerland · 11-30-2019, 05:05 PM

I have harvested several sets of 461X heads off early 1962 327-300hp engines.1.94 & 1.50 valves.

bigsixman · 11-30-2019, 06:04 PM

[QUOTE=Dwight Southerland;602996]I have harvested several sets of 461X heads off early 1962 327-300hp engines.1.94 & 1.50 valves.[/QUOTE

I have seen the same 461X heads on 62 327/300 hp engines and with the small valves.

HP HUNTER · 11-30-2019, 06:16 PM

Never seen a 461 X with 2.020/1.60 Valves. Always 1.940/1.50.

Rich Biebel · 11-30-2019, 07:52 PM

There were really very few small blocks that came with 2.020 and 1.600 valves, OEM...compared to the millions of engines built over the years

I also never saw any 461x heads with anything but 1.940 and 1.500 valves myself.

Many of the real early 1960’s castings were somewhat poor quality. Material seemed soft and the head bolt bosses were easily damaged.
Splits, cracks and other flaws were pretty common. Used to see spots that were welded by the factory occasionally to save a casting. Valve cover rail , deck, head bolt boss.

brian schuetta · 12-04-2019, 08:32 PM

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

Greg Reimer 7376 · 12-05-2019, 11:09 AM

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.

11-30-2019, 01:04 AM	#1
Jim Hawkins Member Join Date: Jan 2010 Posts: 198 Likes: 89 Liked 115 Times in 35 Posts	1966 327/275 cyl head cc Looking at the cylinder head cc the 461x is listed as 172cc intake and 64cc exhaust. All others are 165cc and 65cc. But then there is a note that says port volumes based on "X" head. Does this mean for example a 041 head can be 172cc intake port? Also what is the best intake to use? I have a 3875954.

11-30-2019, 11:47 AM	#2
kansas stocker Member Join Date: Oct 2002 Location: kansas Posts: 235 Likes: 495 Liked 249 Times in 48 Posts	Re: 1966 327/275 cyl head cc The only 461x heads that I have seen came off of vette engines. They all had 2.02 intakes and 1.60 exhausts. The chamber is slightly different from the 461, supplying extra clearance around the valves. Looks like it would be a huge advantage on the 275 hp engine if you replace the seats to use the smaller valves. Pete

11-30-2019, 05:05 PM	#3
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,999 Likes: 64 Liked 772 Times in 192 Posts	Re: 1966 327/275 cyl head cc I have harvested several sets of 461X heads off early 1962 327-300hp engines.1.94 & 1.50 valves. __________________

11-30-2019, 06:04 PM	#4
bigsixman Member Join Date: Sep 2012 Location: Crookston, MN Posts: 157 Likes: 8 Liked 2 Times in 2 Posts	Re: 1966 327/275 cyl head cc [QUOTE=Dwight Southerland;602996]I have harvested several sets of 461X heads off early 1962 327-300hp engines.1.94 & 1.50 valves.[/QUOTE I have seen the same 461X heads on 62 327/300 hp engines and with the small valves. __________________ 1969 camaro, pump gas 540"bbc, jerico 1967 camaro, pump gas efi 620", coan t-400

11-30-2019, 06:16 PM	#5
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 372 Times in 129 Posts	Re: 1966 327/275 cyl head cc Never seen a 461 X with 2.020/1.60 Valves. Always 1.940/1.50.

11-30-2019, 07:52 PM	#6
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,314 Likes: 25 Liked 544 Times in 213 Posts	Re: 1966 327/275 cyl head cc There were really very few small blocks that came with 2.020 and 1.600 valves, OEM...compared to the millions of engines built over the years I also never saw any 461x heads with anything but 1.940 and 1.500 valves myself. Many of the real early 1960’s castings were somewhat poor quality. Material seemed soft and the head bolt bosses were easily damaged. Splits, cracks and other flaws were pretty common. Used to see spots that were welded by the factory occasionally to save a casting. Valve cover rail , deck, head bolt boss. __________________ Rich Biebel S/C 1479 Stock 147R

12-04-2019, 08:32 PM	#7
brian schuetta Member Join Date: Apr 2005 Location: san antonio tx Posts: 259 Likes: 5 Liked 28 Times in 15 Posts	Re: 1966 327/275 cyl head cc What are your typical 462, 461, 041 heads worth these days? Anybody buy/sell these things lately?

12-05-2019, 11:09 AM	#8
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	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.