ADDITIONAL INFORMATION -

http://yblockguy.com/techtips/cylinder_head_mods.html

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I have a pair of small G heads removed from a 1957 Ford PU 272 engine.  The engine was from a Higgins speed boat.  I would assume low hours on these vs a road vehicle.  They appear to be in good shape, however, I’m in the Denver Colorado area.  You might try the Facebook early Thunderbird and Y-block groups to find heads closer to you.   The 113 heads would be a good option as they are on many late 1950s and early 1960s Fords with Y-block engines.

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You can think of the 471 head as basically a G head with larger combustion chambers.


Lawrenceville, GA

According to John Mummert's site, the 471 heads were used on Ford trucks that were equipped with the 292 and Mercurys that were equipped with a 312/w 2-barrel carburetor. They have the same intake valve and combustion chamber sizes as the 1957 F-code supercharged 312. You can find this information on ford-y-block.com.

That would be great but I live in Florida.  LOL!   I have never heard of a 471  head .  Can you tell me more about them?  Thanks, Ray

Ted Eaton recently told me that he had built a normally-aspirated Y-block/w 471 heads and "popup" (domed) pistons that compensated for the larger combustion chambers. Ted said that it ran well. All 471 heads are posted and have hardened valve seats. Personally, I prefer smaller combustion chambers and flat-top pistons on normally-aspirated engines. 

If you want to use 471 heads, and are close enough to pick them up, I have a bare set that looks like they were professionally cleaned by a machine shop & probably checked. I'm not going to use them, and I would be willing to give them to someone who will, but not to anyone who intends to profit from them by selling them to someone else. I'm about 35 miles south of Sacramento. I will not ship them, even on your dime.  

Almost 20 years ago when I built the 340” stroker for my F code clone, Mummert suggested and provided a set of his ported 471’s. Got the compression down to 8.5. So don’t rule those out as useful heads if your going the supercharged route. Ran really nice.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

This may help if not already posted - http://forums.y-blocksforever.com/Topic154841.aspx#bm154844

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Just finding a set of posted G heads can be a challenge. Pretty much all of the G heads I have seen, including mine, are non-posted. 

At the Thunderbird Extravaganza II event in the Sacramento area that I attended two years ago, a set of non-posted G heads was for sale for $600. They were bare heads that had been thoroughly cleaned by a machine shop & probably magnafluxed. I didn't stay long enough to see if the sold. I paid $125 or $175 for mine (can't remember), but that was 5+ years ago. Fortunately, they were within a reasonable driving distance. A bare head weighs approximately 49 pounds; shipping will be expensive, and you will have to go by photos and the seller's word regarding their condition. 

My non-posted G heads have had hardened-exhaust-valve seats and bronze valve builder liners installed, .013 taken off the decks, valve guides cut for viton positive seals, intake valves back-cut 30 degrees, and a three-angle (30, 45, 60) valve job. Cost for labor? $1200. Add the cost of Pac 1286 springs, Mummert's SI stainless valves, retainers, locks, and seals, and we're talking another $500-$600, excluding the cost of the heads. I ported the heads myself; if I had paid to have them ported, who knows how much more they would have cost. You must be concerned about cost; otherwise, you would not have asked. If money isn't a concerned, you could consider buying Mummert's aluminum heads, but I've heard that there's a two-year waiting list. 

Whether you buy G heads or Mummert's aluminum heads, you have to add the cost of rocker-arm assemblies, new or rebuilt.