Re: Chevy Big Block Casting numbers
Per many indentification books, no 3963512 were HD truck* engines, impossible due the design of block.
Only the high HP versions were 4 bolt, the 425 and 450 hp version per Chevy by the Numbers.
*The HD trucks block have "TRUCK" cast into the block behind the timing cover. I have seen this. Also, truck block means Medum and Heavy Duty trucks, not the average 1/2 & 3/4 light duty pickups, which use the same as the cars. They used 2 oil control pistion rings in these truck engines instead of 1 in the rest, making the cylinders 0.400 in longer.
According to Chevy by the numbers, all Tonawanda cast blocks will have a "T" cast into the surface. Tonawanda cast all parts used there.
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NEW cars I had..
66 Impala SS396
70 Chevelle SS 454
72 El Camino SS350
73 Chevelle SS350
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