are these 454=440 cyclones
04-21-2011, 05:48 PM
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are these 454=440 cyclones
these are in a 33 sutphen 1983, mod 440, ser 6181089 and 6181090. valve covers say[ custom built by mercruiser performace products 500hp] theres no cubes anywhere on motors. any idea if theses are 540s or 454s???
04-21-2011, 06:52 PM
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Fixx
454's 500@ the crank and 440 at the prop..Trs boat?
it could also be the 482 that merc built back then,,i believe they were rated @ 500 hp..
Last edited by FIXX; 04-21-2011 at 07:03 PM.
04-21-2011, 09:29 PM
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440 cyclone is a 454. The 460 cyclone is the 482. Everything is the same except the stroke, compression and floating piston pins. Here's some of the specs if your interested.
440 cyclone:
8.8:1 compression
Iron rec port heads
Aluminum hi rise intake
850 Holley mech sec
4 bolt mains
Forged rods, pistons and crank
aluminum roller rockers
fully polished crank
precision angle valve job
cam 288/296
lift I .549" E .558"
440 cyclone:
8.8:1 compression
Iron rec port heads
Aluminum hi rise intake
850 Holley mech sec
4 bolt mains
Forged rods, pistons and crank
aluminum roller rockers
fully polished crank
precision angle valve job
cam 288/296
lift I .549" E .558"
