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pishta said

now if the member here that has 2 D-Darts can put to rest this 1.87 valve issue, Ill sleep better tonight. Curiously, the 1.87 figure is the valve center to center of all LA heads.....and its also a dyslexic 1.78. I wonder if something got screwed up in translation?

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Must be talking about me. I took the heads off of the first D/Dart that I owned and didn't measure the valves. I'm pretty sure that they were 1.78's and 1.50's. The block is not chamfer for valve clearance. This is what the piston in the D/Dart engine looks like. It had 128,000 miles on the car when I got it. About 75,000 of those miles were in California with the 4.86 gears in it. The engine also has the barbell style lifters in it.