What Pistons did Merc use in the 365 HP 454 magnum Motors?
Thread: 454 Mag Pistons
Results 1 to 9 of 9
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07-09-2009 09:41 PM
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07-09-2009 11:06 PM
not sure what brand but i believe they are forged slugs if that helps
Throttles- Cleveland Construction/Traffic Light Racing 377 Talon cat
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07-09-2009 11:13 PM
Do you think Forged 8.5:1 Speed Pro's would be a simular replacement?
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07-10-2009 12:03 AMIf you're planning on staying stock, any forged piston will be OK. If you want to get some more easy HP out of it, you'll probably want a better piston. There are alot of differences in materials, quality, design and strength in a better piston. HOW an engine is assembled is usually more important that the parts.
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07-10-2009 12:12 AM
The boat I'm buying has 1 motor in it that has 10 hours on it. It was built 3 years ago and has no build sheet and the guy that built it doesnt remember what got put in it. I need to make a twin to it. He thinks he put a Comp 280AH cam in it and since he mentioned possibly speed pro's, I was just curious if that would be a standard replacement.
Either I'm going to build what I think it has or I'm gonna build what i want and then next year go though the other motor and make it like what I'm building this one as.
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07-10-2009 09:06 AMSpeed Pro is the old TRW catalog. OK for medium performance applications.
As long as they fit and they're forged, buy what you can get a good deal on.
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07-14-2009 03:20 PM
454 mag pistons were forged TRW's.
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- Jun 2009
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07-15-2009 07:05 PMThe Speed Pro P/N for a stock forged 365 mag piston is L2399F