I can tell you first hand what happens when you install pistons with the "F" to the rear and offset in the wrong direction. I did it once. To this day I don't know how, other than the pistons were "odd" and no "F " on the top or "notch" to indicate direction. They were also only two valve reliefs with the reliefs the same size which made things even more confusting. The were marked on the sides of the pistons with an "F". Somehow I messed all of them up and paid the price for it.
I put the engine in service and ran it about 10,000 miles. It was a SBC 400 (406). It never sealed up well and consumed about a quart of oil every 600 miles or so. Ran just fine other than oil fouling a plug once in a while. I ran it long enough to make sure it was NOT going to get any better and pulled it. Found the mistake, made the fix, and put another 90,000 miles on it without issue and next to zero oil consumption between oil changes.........one of the really HARD lessons I learned early in this game that I never repeated.......FWIW......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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