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

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Old 01-29-2003, 11:12 AM
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GNJ2
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Question Any one know the cam specs and compression ratio for stock 502's?

Looking for specs on 1998 502 MPI motor

Thanks
 
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Old 01-29-2003, 11:28 AM
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Brad Perry
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8.75:1
 
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Old 01-29-2003, 07:47 PM
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I'm showing GM cam #12551622 or Mer.#431-8510478 is 224 224 duration .483-.483 lift 115.5 LSA
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Old 01-29-2003, 09:54 PM
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FindMe
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Boy, are you ever missing out..... Here ya go, just click on the prop!

 
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Old 01-29-2003, 10:01 PM
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Dennis Moore
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Default 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
 
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Old 01-30-2003, 07:31 AM
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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.
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Old 01-30-2003, 11:37 AM
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ursus
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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

Last edited by ursus; 01-30-2003 at 11:41 AM.
 
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Old 01-30-2003, 11:24 PM
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My MkIV 502 service manual shows identical specs as the Gen6 (224/224 .483/.483).
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Old 01-31-2003, 08:09 AM
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GNJ2
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OK Thanks to everyone for all the replies.
 
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Old 02-01-2003, 11:52 AM
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Ric232
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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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