461X Heads ?????
Thread Starter
Racer
Joined: Apr 2004
Posts: 260
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From: Wyoming NY
461X Heads ?????
461 X Heads ?????
I have been researching the use of the 461X head for the 1961 315HP engine. I would like to confirm casting dates with the end head symbols (double hump, double hump with flat tops and rectangle symbols). The dates I am interested in are form August 1960 to August 1962. Pictures with dates for documentation would be appreciated, but all information is welcome.
Please email:
ray63@rochester.rr.com or post on forum and I will cut and paste.
Thanks for any information!
Ray
I have been researching the use of the 461X head for the 1961 315HP engine. I would like to confirm casting dates with the end head symbols (double hump, double hump with flat tops and rectangle symbols). The dates I am interested in are form August 1960 to August 1962. Pictures with dates for documentation would be appreciated, but all information is welcome.
Please email:
ray63@rochester.rr.com or post on forum and I will cut and paste.
Thanks for any information!
Ray
Race Director
Joined: Oct 2005
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From: Camp Verde AZ
C1 of Year Finalist (performance mods) 2019
2017 C1 of Year Finalist
Pardon my ignnornace, but where does the X come in?
is that the X mark i see in the third pic on the left on the underside of the intake runner area directly under the water passage?
BTW, nice intake manifold collection.
Thanks,
Doug
is that the X mark i see in the third pic on the left on the underside of the intake runner area directly under the water passage?
BTW, nice intake manifold collection.
Thanks,
Doug
Last edited by AZDoug; Aug 3, 2007 at 01:29 PM.
One gear at a time
Joined: Aug 2003
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CI 8-9-10 Veteran
St. Jude Donor '07-'08-'09
Doug,
I think all the early 461 castings had X on the bottom side. This carried through, at least until some point in the 63 MY. They are supposed to have slightly larger runners.
A few years ago, I had a set of 487X heads. These were big chamber heads, but had 2.02 and 1.6 valves. IIRC, they had a 72 or 73 casting date.
Wes
Re the intakes: I have a bad habit of grabbing them every time I find one at a decent price. I got the darn things stashed everywhere. I'm getting better, I used to be the same way with cylinder heads too...
I think all the early 461 castings had X on the bottom side. This carried through, at least until some point in the 63 MY. They are supposed to have slightly larger runners.
A few years ago, I had a set of 487X heads. These were big chamber heads, but had 2.02 and 1.6 valves. IIRC, they had a 72 or 73 casting date.
Wes
Re the intakes: I have a bad habit of grabbing them every time I find one at a decent price. I got the darn things stashed everywhere. I'm getting better, I used to be the same way with cylinder heads too...
Last edited by Uesu; Aug 3, 2007 at 01:39 PM. Reason: Added intake comment
Thread Starter
Racer
Joined: Apr 2004
Posts: 260
Likes: 0
From: Wyoming NY
Thanks Wess,
Is there any chance you may have a close up picture of the casting symbol? The symbol looks to be the round top symbol in the picture and I would like to confirm this? I believe that the symbol changed occurred sometime mid-1962 and your heads fall right in line.
Thanks very much for the photos and information!
Ray
Is there any chance you may have a close up picture of the casting symbol? The symbol looks to be the round top symbol in the picture and I would like to confirm this? I believe that the symbol changed occurred sometime mid-1962 and your heads fall right in line.
Thanks very much for the photos and information!
Ray
Pro
Joined: Jul 2006
Posts: 556
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From: North of Spokane WA
When researching the heads on the 400 smallblock I bought last week, I found that the 487X heads were Corvette and 487 heads were for other applications. Both are 2.02 intake valve heads. I do not know what differences there are between the two.
As for 461 and 461X, maybe it's a similar situation. I do not know.
Doug
As for 461 and 461X, maybe it's a similar situation. I do not know.
Doug
One gear at a time
Joined: Aug 2003
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CI 8-9-10 Veteran
St. Jude Donor '07-'08-'09
Ray,
These are the best pics I have. The engine is in the car, and I don't think I could get a decent pic if I tried. If I remember right, I was told my car was built on April 9, probably making it a fairly late car. Also, One of my heads has a different (later I think) date than the other. I didn't really pay attention to it, because the car was beat-on in it's previous life, and that sort of thing is to be expected.
Wes
These are the best pics I have. The engine is in the car, and I don't think I could get a decent pic if I tried. If I remember right, I was told my car was built on April 9, probably making it a fairly late car. Also, One of my heads has a different (later I think) date than the other. I didn't really pay attention to it, because the car was beat-on in it's previous life, and that sort of thing is to be expected.
Wes
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Burning Brakes
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From: fighter pilots make movies, bomber pilots make history
Ray,
The 461x have bigger intake volume.
Go to http://users.erols.com/srweiss/tablehdc.htm neat stuff about all the heads. Those old 461-462 are still impressive performance.
Seems the x is not just a control number but better intake flow
Nothing better than a Sateen Silver 61 270 hp...I have had one for 40 years, Wes and his wife have seen it at BG
Joe
The 461x have bigger intake volume.
Go to http://users.erols.com/srweiss/tablehdc.htm neat stuff about all the heads. Those old 461-462 are still impressive performance.
Seems the x is not just a control number but better intake flow
Nothing better than a Sateen Silver 61 270 hp...I have had one for 40 years, Wes and his wife have seen it at BG
Joe
Racer
Joined: Dec 2005
Posts: 278
Likes: 1
From: Mukilteo Washington
Back in the 70's I was racing a 67 ChevyII when the information about the"X" heads came out (bigger runners). I made all the necessary changes to my car to make it a 1966 to conform to NHRA rules.
That said, the word back then was the x heads were iron casting of the alum. head for the fuel injected 283 in 1961 that was never used in production.
So if you have a set of 461x heads that would be correct for a 1961 Corvette, you have a very hard to come by part.
Jim
That said, the word back then was the x heads were iron casting of the alum. head for the fuel injected 283 in 1961 that was never used in production.
So if you have a set of 461x heads that would be correct for a 1961 Corvette, you have a very hard to come by part.
Jim
One gear at a time
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CI 8-9-10 Veteran
St. Jude Donor '07-'08-'09
BTW, I don't remember your car's heads. Did yours have the camel humps on it? IIRC, you were running low 14s at 98-99 mph.
We finally got the 327 back in the 62 and running. As long as I can keep the car in one piece, we'll be bringing it to the Corvette Forum Cruise-In next year. I have the car dialed-in fairly well, and it's an animal... looking forward to running it at Beechbend.
Wes
