Aluminum Winfield head ID

[562Roadster]

I recently acquired an aluminum Winfield head. I'm trying to positively identify its compression ratio. The previous owner told me it was a 6:8. There's a casting number stamped on top of the head and it reads: 10112

Can anyone tell me what those numbers mean?

Many thanks,
George

[Rex_A_Lott]

It means you have to cc the combustion chamber and calculate the CR to be sure. Good Luck!

[Miles in MN]

Originally Posted by 562Roadster

I recently acquired an aluminum Winfield head. I'm trying to positively identify its compression ratio. The previous owner told me it was a 6:8. There's a casting number stamped on top of the head and it reads: 10112

Can anyone tell me what those numbers mean?

Many thanks,
George

I purchased a 6.8:1 Winfield head about five years ago. The 6.8:1 head has what is called the "Crow's Foot" combustion chamber; there are two bumps that project into the chamber towards the valve. The bumps allow a relatively deep chamber for air flow while reducing chamber volume for compression. There are two other aluminum Winfield heads that I am aware of, both with similar combustion chambers of the basic Ricardo design. These two heads are advertised as 7:1 and 8:1. The 7:1 head has a chamber depth of roughly 0.750 in. in the valve pocket, and the 8:1 head has a depth of 0.400 in. in the valve pocket. These measurements were taken from two heads which I personally measured, so I would consider the chamber depth as described above to be a reliable way to identify these two versions of the reproduction aluminum Winfields.

My 7:1 head has a five-digit number similar to what you list, it is 97-124. I have always assumed that it referred to the 124th head cast in 1997, but I am not sure. Following that logic would make your head the 112th cast in 2010, if that's indeed what the numbers mean.

I am running my 6.8:1 head on a highly modified Model A engine and have been very happy with how it performs. You have to make sure that you have adequate clearance to keep the pistons from hitting the head; you will likely find that your pistons extend above the deck of the Model A block, and they may also vary depending on what rods you have. There is often variation in the rod lengths based on how they were babbitted and machined. I found over 0.020 difference from my lowest to my highest piston when I originally built my motor. We corrected the issue by machining the tops of the pistons so that they all projected the same amount above the deck upon final assembly. If you take material off the pistons they will need to be rebalanced to get all the weights equal again before assembly.

[wensum]

I have an alloy Winfield head, supposedly 7:1, but I had to get it machined to ensure piston clearance (rather than dismantle, machine the pistons and then get the motor re-balanced)
Also I had to get the combustion chamber relieved to clear larger inlet valves, so I guess the compression ratio has been reduced a tad, but I've no idea how much.
At this stage, there's little point in worrying about the compression ratio?

[colin1928]

It should have a machined pad with Nos stamped in it these are where the compression ratio will be

[Rex_A_Lott]

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Originally Posted by wensum

I have an alloy Winfield head, supposedly 7:1, but I had to get it machined to ensure piston clearance (rather than dismantle, machine the pistons and then get the motor re-balanced)
Also I had to get the combustion chamber relieved to clear larger inlet valves, so I guess the compression ratio has been reduced a tad, but I've no idea how much.
At this stage, there's little point in worrying about the compression ratio?

If the head is still off, its not that hard to check. If its together and running OK, then I agree, no real point in checking it now.
This sort of thing ( machining, clearancing, etc.) is why I said you have to check it to know for sure.
Good Luck to all.

[Juggler]

Originally Posted by colin1928

It should have a machined pad with Nos stamped in it these are where the compression ratio will be

This is mine. Sits on a warmed over Diamond B in the truck in my avatar


Winfield by juggler29, on Flickr

I bought it at the Big 3 meet at San Diego. Had been polished on the outside, but seemingly never run. Casting in chambers was pretty rough. Found the best thing to polish them up was a little flapper wheel on a Dremel.


Winfield3 by juggler29, on Flickr

The markings on the outside are a 'Flying A logo' then 07 150. I thought it was a 7:1 casting, but as above have also been told that that was a date/sequence code. Any other info/clarification gratefully received.

Cheers

Juggs

[562Roadster]

Mine has the flying A logo also. I will try and post pics up asap

[Jim Brierley]

the flying A logo heads were made by jim gordon of Speciality Ford Parts in rosemead, ca. he made 2 like the one pictured in juggler's reply, one was 6:1, the other supposedly 8:1 but mine cc's at 10:1. he also made a crows-foot head, i think 7:1 but am not sure on this. i recommend cc'ing to be sure it is not too much for your intended use. these were all numbered like jugglers, indicating the year made followed by the serial number for that year. they are all good heads. on the original iron heads the first number indicated the compression ratio.

[hardtimes]

Originally Posted by 562Roadster

Mine has the flying A logo also. I will try and post pics up asap

Hey George,
Yeah, that 'flying wings' logo is the 'trademark' marking of the maker of those heads, i.e.- Specialty Ford Parts store in Rosemead, Ca.
He, Jim, still has some new /old stock that I just saw this past Saturday. And, as guessed the first number on stamp area pad...is YEAR and the next three numbers are which # in production made.

BTW.. I do not believe that these repro heads have any c/r stamping on them. IMO, they do not even know what c/r is..hey it's a copy..ha !

[just plain bill]

Originally Posted by hardtimes

Hey George,
Yeah, that 'flying wings' logo is the 'trademark' marking of the maker of those heads, i.e.- Specialty Ford Parts store in Rosemead, Ca.
He, Jim, still has some new /old stock that I just saw this past Saturday. And, as guessed the first number on stamp area pad...is YEAR and the next three numbers are which # in production made.

BTW.. I do not believe that these repro heads have any c/r stamping on them. IMO, they do not even know what c/r is..hey it's a copy..ha !

If you call Jim At Specialty Ford Parts in Rosemead he will tell you the original compression ratio based on the numbers stamped in the pad on the head.

[562Roadster]

Thanks so much guys! Rosemead isnt that far from me. I may just have to stop by.