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502 or 454 how to tell ?

Old 05-03-2009, 08:39 AM
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Default 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?
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Old 05-03-2009, 12:40 PM
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Down on the side of the block about in the middle will be 7.4 if it is a 454 or 8.2 if it is a 502.
Eddie
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Old 05-04-2009, 07:28 AM
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Originally Posted by Young Performance View Post
Down on the side of the block about in the middle will be 7.4 if it is a 454 or 8.2 if it is a 502.
Eddie
Thanks,I'll check that.
Bill
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Old 05-04-2009, 10:23 PM
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Originally Posted by Young Performance View Post
Down on the side of the block about in the middle will be 7.4 if it is a 454 or 8.2 if it is a 502.
Eddie
I looked at the block and no 7.4 or 8.2. It's a gen4 bowtie, in the back corner is 445 high performance. on the right side is the chevy synbol. The owner said it's a 454 and another guy who worked on it 10 years ago said it's a 502. Just looking for some info.
thanks
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Old 05-08-2009, 12:43 PM
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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
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Old 05-08-2009, 12:53 PM
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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"

Last edited by Wobble; 05-08-2009 at 02:22 PM.
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Old 05-08-2009, 12:58 PM
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454 has a fuel pump mount and the 502 does not.
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Old 05-08-2009, 01:01 PM
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Originally Posted by Back4More View Post
454 has a fuel pump mount and the 502 does not.
The markIV 502 has a fuel pump mount!!
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Old 05-08-2009, 01:04 PM
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Originally Posted by Back4More View Post
454 has a fuel pump mount and the 502 does not.

that depends on the engine generation
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Old 05-08-2009, 01:59 PM
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Originally Posted by Westcoast View Post
The markIV 502 has a fuel pump mount!!
Man, I know less than I thought....time for me to quit talking.
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