Which heads are which?


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By gritsngumbo - 15 Years Ago
In attempting to identify some Y-Block heads, I noticed the following on John Mummert's site:



YEAR CASTING # Cu.In. Int. valve *C.R. CC’s H.P. Carb. VEHICLES

57 ECZ-G 272 1.92" 8.6 69cc 190 2 bbl 57 Pick-up



57 ECZ-G 292 1.92" 9.0 69cc 206 2 bbl Ford, T-Bird



57 ECZ-G 312 1.92" 9.7 69cc 245 4 bbl Ford, Mercury, T-Bird



57 ECZ-G 312 1.92" 9.7 69cc 270 2X4bbl Ford, T-Bird



I appears that there are four different "G" heads. Or is there only one "G" head with the difference in the compression ratio due to different pistons or piston/rod combination? If there ARE different heads, how do you tell them apart?



I don't have "G" heads and probably won't have them due to the difficulty in locating "good" heads today. But this is just one example of several head numbers that are off different cars/trucks and have different characteristics.
By Hoosier Hurricane - 15 Years Ago
Gerald:

They are all the same heads.  The compression ratios are different because of the different displacements.

By gritsngumbo - 15 Years Ago
OK, that makes sense. Thanks.