Quote:
Originally Posted by mgarblik
You are so right about some of the mysteries that surround these engines. My early 73 SD-455 engine has NO casting numbers on the exhaust ports and NO date codes. Only the full part number on each head. It has "A" connecting rods in it so I feel safe saying it was a pretty early engine.
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The 455-SD is definitely a unique engine.Even though it was produced in low numbers it’s a wonder that it even made it into production with upper management at Pontiac changing attitude toward performance and the federal regulations on the horizon.No other mfg had anything like it at the time.