Y-Block Revisited
For his buildup, Carlisle put Silv-O-Lite aluminum pistons on the Y-block connecting rods. The rods have floating wrist pins; make sure the wrist-pin keeper is properly seated or the resulting damage will ruin your block. These pistons, in combination with the stock combustion chambers, will give the motor a nice, streetable 9.1:1 compression. A word about bore: This particular motor has been bored 0.080-inch over, from the 292’s 3.750 to the 312’s 3.800, plus an additional 0.030 overbore. Carlisle told us there is so much material in the cylinder walls that he’s seen often-rebuilt blocks bored as much as 0.120-inch over.
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