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What I'm saying is there were no "E" heads in the US for '72, only "F" (as defined by the photos). It went like this in the US:
- In 1970 and 1971, all US spec cars with FI had "E" heads with 10.5:1 compression.
- In model year 1972 the "F" head was introduced with lower compression & different ports. There were no "E" heads sold in the US beginning with the 1972 model year.
Said another way, I'm pretty certain there were no early casting FI heads ("E" in the photo) ever sold in the US with anything but 10.5:1 compression. If I understand correctly, you're saying that was not the case in other markets, right?
The Holden is doing fine, we simply don't put a lot of miles on it (55k in 5 years), so it would probably easily last my lifetime if I so chose. I did commit to at least a couple of years further use by putting a new set of Michelins on it a few months back. Incidentally, all 4 OEM Goodyear RS-A's had shifted belts by that time, one of them bad enough it became impossible to balance. In any case, I'm thinking maybe a rear drive Cadillac is in my future. Here in the US, GM is getting near-Cadillac prices for the latest Holden (Chevrolet SS) anyway, while the Caddy's are more refined, just as fast :) and get better fuel mileage.
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Gary L - 142E ITB race car, 73 1800ES
YouTube Racing Videos
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