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Old 07-17-2007, 12:48 PM   #1
DZAUTO
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Default 461 vs 461X heads

Is there anyone here who is very familiar with the differences between a 461 and a 461X head, both physically and useage?
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Old 07-17-2007, 01:38 PM   #2
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According to MORTEC web site X is for 60 thru 63 cars, other non X is 64 thru 66.
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Old 07-17-2007, 02:04 PM   #3
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Hey Tom,
The runner size on the Xs is a little larger, I'm recalling between 5-10CCs more than the regular 461s but I don't have any references handy at the moment.
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Old 07-17-2007, 02:43 PM   #4
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Hey Tom,
The runner size on the Xs is a little larger, I'm recalling between 5-10CCs more than the regular 461s but I don't have any references handy at the moment.
461x - 5 cc bigger is considered normal amount. I used to get calls in the 80s for these heads.
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Old 07-17-2007, 03:38 PM   #5
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I have always been aware that the X heads had slightly larger intake runners----------------------but I've never been aware of the X heads being related to year models. I have understood that the X heads were (or possibly were) associated with the higher perf engines. Yes or no?
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Old 07-17-2007, 04:10 PM   #6
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Quote:
Originally Posted by DZAUTO View Post
I have always been aware that the X heads had slightly larger intake runners----------------------but I've never been aware of the X heads being related to year models. I have understood that the X heads were (or possibly were) associated with the higher perf engines. Yes or no?
Hi Tom I can't give you a definitive answer weather they were H/P heads or not. However my 64 FI has it's original heads and they are the X heads. Maybe we can get a consensus on who has the X heads and there original H/P rating. Chris
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Old 07-17-2007, 04:31 PM   #7
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My 64 300Hp has 461 heads, 1.94/1.5, not the 461X.
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Old 07-17-2007, 04:38 PM   #8
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My 64 300Hp has 461 heads, 1.94/1.5, not the 461X.
I have my original 64 300 hp 1.94/1.5 461 heads, not "X".
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Old 07-17-2007, 04:49 PM   #9
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Tom,

My 62 has 461X heads; they originally had 1.94/1.5 valves in them. I also have two sets of 1963 461X heads on a shelf, that I picked up years ago... don't know the history fo them, though. Wes
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Old 07-17-2007, 05:07 PM   #10
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Default 461's vs. 461X's

The 461 castings that had the "X" included had a 10 cc larger intake runner, the "later" 461's had 161 cc (average) runners while the "early" 461X's had 171's/172's.

Now to the "average" hotrodder here it really makes little difference in the "bottom-line", HOWEVER, if you're involved in some "legal" class racing, maybe along the lines of a "C-Econo" record holder, these "X's" were "worth their weight in gold". There was "no porting allowed" in many of these classes in NHRA!

The difference between coming home from a weekend of racing with the "winnings" or not was often determined by whether you had these castings!

Thanks, Gary in N.Y.

P.S. Back in the '70's you could make a "trade" and fetch some 5 pair of 461's for a single pair of the "X's". They were also extremely popular with the "roundy-round" guys. They made some HP in their day, even without any porting!!
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Old 07-17-2007, 05:32 PM   #11
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Are there any hard and fast dates of when the 461x's were used versus the 461's? I have seen 461 heads for sale that had production dates of 62 and 461x's with dates of 63?
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Old 07-17-2007, 06:58 PM   #12
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Are there any hard and fast dates of when the 461x's were used versus the 461's? I have seen 461 heads for sale that had production dates of 62 and 461x's with dates of 63?
All of the 461X' heads I have seen are 62' & 63' head castings (all with 1.94I/1.5E valves). There may be 60' & 61' sets but I have never found one.

You can find 461' heads with casting dates from late 60' to 65'. The SHP 461 heads changed to 2.02I/1.6E valves in 64' (L76 & L79 heads, and the ones I have seen have no "X").

There are rumors of 461X heads with the larger 2.02I/1.6E valves. I have never seen a confirmed untouched factory set in this configuration. I have seen lots of modified 461X heads with the larger valves, but no factory sets (maybe someone else can speak up).

There are also rumors of some 462 heads with the "X" cast into the intake runner, indicating a larger volume runner, as if the 461X intake plugs were used with the later large valve 462 head. I have never seen one. Considering the 461X head mold plugs may have been removed from the foundry after 63', it's hard to imagine someone swapping a set in 66/67' to cast up special 462 heads.

Over the years head porters have told me that regular 461 & 462 head ports can be opened up past the 461X volume, and the ports can be contoured to flow better than the 461X heads. The modern problem is few people want to port iron heads, it just too dirty and can drain your energy (it makes you feel sick).

The X heads require less work if you plan to go larger than ~175cc's, but these X heads real value has always been to the limited class racers who had to run uncut heads.
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Old 07-17-2007, 07:50 PM   #13
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Default 461 X Heads

The 461 X heads were first used in 1961 on the fuel injected engine. The heads were the main reason for the increased HP rating for the 61 FI. They were basically the same head as the aluminum head that was introduced in 1960 and dropped do to problems shortly after they were introduced. The symbols on the end of the heads started our as a rectangle (very early 1961), followed by the first double hump head. The shape of the first double hump symbol was a little different, with the top of the humps cut off or flat. This symbol was used into the 1962 production year and finally changed to the round top double hump symbol. I believe some time during production the X was dropped and the heads became known as 461 heads and used for other engine applications. If any one has a set of very early 1961 461 X heads, I would be very interested purchasing them.

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Old 07-17-2007, 09:24 PM   #14
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The roundy-rounds could not use the 461 castings (at least not around here).

The 462s were used with the 461 runners. I had several sets in the 1980s, I had to split up two sets to make a pair of them.
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Old 07-17-2007, 09:24 PM
 
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