Offshoreonly.com - Any one know the cam specs and compression ratio for stock 502's?

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GNJ2	01-29-2003 10:12 AM

Any one know the cam specs and compression ratio for stock 502's?

Looking for specs on 1998 502 MPI motor

Thanks

Brad Perry

01-29-2003 10:28 AM

8.75:1

FloridianSon

01-29-2003 06:47 PM

I'm showing GM cam #12551622 or Mer.#431-8510478 is 224 224 duration .483-.483 lift 115.5 LSA

FindMe

01-29-2003 08:54 PM

Boy, are you ever missing out..... Here ya go, just click on the prop!

http://home.attbi.com/~fordhater/PROPELL.GIF

Dennis Moore

01-29-2003 09:01 PM

Don't trust those specs!

I removed a camshaft from a Gen VI Mercruiser engine with roller lifters and sent it to Comp Cams to be measured and it came back with the specs Floridian Son gave.
Dennis Moore

audacity

01-30-2003 06:31 AM

mine was in the VERY low 8's when we measured....most were under 8 1/2. this was pre 96 when i was doing these.

ursus

01-30-2003 10:37 AM

The cam spec given by findme 211-227 .511-.511 were used on the gen 5 engines ( im not sure about mkIV) the newer gen 6 are 224-224 .483-.483

built to spec ( blueprinted) CR should be 8.75, mine measured out at 8.78 however have been told by a merc rebuild depot the factory engines are all over 8.5 to 8.8

mcollinstn

01-30-2003 10:24 PM

My MkIV 502 service manual shows identical specs as the Gen6 (224/224 .483/.483).

GNJ2	01-31-2003 07:09 AM

OK Thanks to everyone for all the replies.

Ric232

02-01-2003 10:52 AM

Okay, I'm confused.

My Gen6 service manual shows 511/511 lift and 211/227 duration. I believe the 483 lift cam is the Gen 5 cam.

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