Also look on the side of the engine block for the casting size in it. It will say 8.2 if its a 502 and 7.4 if its a 454.

I have a 1997 HP 500 that has a roller cam.

Gen 5 HP500's used Crane hyd. roller lifters with link bars between pairs. They're still listed in the Merc parts catalog for about 1700.00 a set. And about 1000.00 for the cam.

apparently on the block it says "hi perf pass"
the serieal number is 6269315
it has 10051107 cast into the block

both numbers said "part number not found".......I think I did it right.

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.

I went on www.mortec.com (cool site) with the 10051107 number came up as a 454 4 bolt mark 4 bowtie block.

the guy called me back said he found the Merc mod number on the engine its D515839......comes up not found on the Bam site.....

465 '90-'92 numbers are oc849992-of213244. 500's start at of213293 . My guess hes got 465. His # must start with OD not D
Jim

The 500 bulldog also fits those numbers. OC577253-OF745405