502 or 454 how to tell ?
05-03-2009, 07:39 AM
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502 or 454 how to tell ?
I've come across a ski boat with a big block in it and the owner said he's not sure what the engine is. Is there a way to tell just by looking at it?
05-04-2009, 06:28 AM
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05-04-2009, 09:23 PM
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thanks
05-08-2009, 11:43 AM
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My gen IV 502 has the bowtie also but that just shows it's a GM performance " bowtie " block i think it could be either a 454 or 502 still . the dealer i got the boat from had it listed as a 454 , got her home stood on my head to see the merc s/n tag to find it was a 502
05-08-2009, 11:53 AM
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look for the casting numbers and go here http://www.mortec.com/
this site is an excellent source of info on heads and blocks
BBC numbers http://www.mortec.com/bbc.htm
My 502 is this one
10051107...454...............4-bolt, Bowtie, MkIV, 9.8" deck, siamesed bores, 4.25" semi-finished bores, can be bored to 4.50"
this site is an excellent source of info on heads and blocks
BBC numbers http://www.mortec.com/bbc.htm
My 502 is this one
10051107...454...............4-bolt, Bowtie, MkIV, 9.8" deck, siamesed bores, 4.25" semi-finished bores, can be bored to 4.50"
Last edited by Wobble; 05-08-2009 at 01:22 PM.
