"I'd agree with Cliff that the pistons had a trough, so thinking they were not off-set. Also seem to remember Pontiac had complaints about piston slap when cold on the SD Birds?"
I have some orginal SD pistons around here someplace hanging on a set of Crower rods but not sure where I stuffed them? They came out of an ill-fated 455 that we lost at the top end of the track at 6400rpm's when the lifter bores caved in. A good lesson is getting a bit too "aggressive" (276/284@ .050" and .750" lift) with a solid roller camshaft in a full race application.....and yes, we have a lifter bore brace in that engine, it just made more of a mess to chean up when we took it apart for inspection.
If I run into them (I'm in the middle of a big shop clean up since retiring) i'll make it a point to check them for pin offset and kindly ask the Moderators to make a "stickie" out of it.........Cliff Out....
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https://cliffshighperformance.com/
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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