Identifing an HP500
#13
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#16
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OK, I went to stem to sterns web site, and looked up the serial number. First off, all of the Merc racing serial numbers started with 2 letters, then the numbers. The 6269315 comes up as a 370 TRS. meaning it's a 454. Hope it helps.
Darrell.
Darrell.
#17
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I went on www.mortec.com (cool site) with the 10051107 number came up as a 454 4 bolt mark 4 bowtie block.