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Compare the combustion chamber of the 83 era Nissan 280 ZX on the far right in the attached photo. The piston to head clearance was 1 millimeter on the flat portions of the cylinder head. The configuration you have produced looks very similar to the one in the attached photo. Nissan z cars in federal emissions configurations of the era had no catalytic converters. My 76 in factory emission trim had no cat, no air injection and no egr and it was emissions legal in 1976. I put an 83 head on my 76 on top of a factory new short block with flat top pistons. Compression readings went from 160 to 200.
That 76z would pull 28 mph highway andI could control the mixture with a rheostat that added resistance to the water temperature circuit. I was not really interested in maximizing mileage when I owned that car almost 20 years ago but it was a lot of fun to drive. With the original 3.45 diff (later a 3.90) and a .75 od 5th gear and weighing less than 2400 pounds, it was fun to drive, but could not hold a candle to a modern design with 40 years of fuel delivery evolution.
regards
mech
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