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Old 12-18-2012, 01:35 AM
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Covi Covi is offline
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Boat: 2008, PS 197, LY6
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89 owners manual reveals the following about the Chevy 454

There were two 454's. Both were 7.4 litre. One was coined an HO. Here are some specs.

Both the same
Displ. 7.4 / 454 CID
Bore & Stroke 4.25 x 4.00
comp ratio 8.8:1
Block GM
Fuel Sys Holley 4 barrel

Not the same
RPM HO version turns 200 more per min. @ 4600
HO was a left hand rotation only.

Net weight of engines are identical.
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