how to ID heads
Posting Guru
Joined: Mar 2002
Posts: 2,070
Likes: 2
From: Boise, Idaho
Check out Mummert's web site, www.ford-y-block.com. He has a page that describes where to find the ID and what CR they are.
The ECZ-C heads have their ID between exhaust ports. Other heads have them on the underside of the water ports on the intake surface of the heads. Some heads, like the C3TE heads have them under the valve covers.
The C1 and C3 heads are ok, but not high performance. The heads with the biggest ports and valves and the smallest chambers are the ECZ-G and the -113. Y-guys will seek out the ECZ-C for F100's because they have chambers that are small enough to get good compression, and valves big enough to work. If you've got a honking stroker 312/342 you might want the 471 or ECZ-B to get the compression ratio down to a reasonable level.
The ECZ-C heads have their ID between exhaust ports. Other heads have them on the underside of the water ports on the intake surface of the heads. Some heads, like the C3TE heads have them under the valve covers.
The C1 and C3 heads are ok, but not high performance. The heads with the biggest ports and valves and the smallest chambers are the ECZ-G and the -113. Y-guys will seek out the ECZ-C for F100's because they have chambers that are small enough to get good compression, and valves big enough to work. If you've got a honking stroker 312/342 you might want the 471 or ECZ-B to get the compression ratio down to a reasonable level.
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Senior User
Joined: Feb 2007
Posts: 104
Likes: 0
From: San Diego
ok going by that I seem to have some 471's thatI pulled off this $100 y-block I bought for parts. The block cast # is B9AE is there a way to be sure this is a 292 and not a 312. And going by your info the 471's are not the ideal head for a stock rebuild?
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
Posted can be milled .045. Non posted .025. If stock compressions are run, it isnt worth worrying about over posted/nonposted. For each .0055 milled figure 1 cc reduction in combustion chamber volume.
Last edited by 46yblock; Aug 27, 2007 at 10:51 AM.
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Senior User
Joined: Feb 2007
Posts: 104
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From: San Diego
well turns out the heads on my motor thats still in the truck are the 113's so I think I will be rebuilding them. I guess this would be a good time to have them reseated for unleaded gas so I can stop running lead additive.
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