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Old 10-28-2007, 01:32 PM
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425 and 455 oldsmobile ??

Hi will a 425 olds. motor interchange with a 455 olds. I found a 1965 olds. tornado with a 425 motor. Would like to install it in a jet boat that had a 455 olds. in it. Any suggestions? Thanks Danny Sorry this post was suppose to be listed under motors don't know how to move it.

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Old 10-28-2007, 03:16 PM
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Anyone know if they will bolt up?
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Old 10-28-2007, 03:25 PM
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I think the 425 & the 455 BBO is the same. but you should ask over at www.realoldspower.com, theres even a section there for Olds powered Boats. theres some Olds Horse Power Nuts there, enjoy.
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Old 10-28-2007, 05:29 PM
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Tried that for some reason will now let me register.
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Old 10-28-2007, 05:55 PM
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The 425 is a direct swap for the 455. Good chance the crank in the 425 will be steel. (an added plus) and the toronado engines have a deeper oil pan for that extra oil...
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Old 10-29-2007, 11:56 AM
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Quote:
Originally Posted by gl0rywagon
Hi will a 425 olds. motor interchange with a 455 olds. I found a 1965 olds. tornado with a 425 motor. Would like to install it in a jet boat that had a 455 olds. in it. Any suggestions? Thanks Danny Sorry this post was suppose to be listed under motors don't know how to move it.
All big block Olds motors are externally identical but there are a few things that you need to be aware of:

The Toro wasn't released until 1966, so be sure you know what you're getting.

ALL 425 Olds motors have forged cranks.

The 64-67 Olds motors used a different crankshaft flange bolt pattern than the 68-90 motors. You must use the flywheel or flexplate for a 64-67 motor. The flywheel from a 455 will not work.

The Toro used a different oil filter adapter than the RWD cars. I don't know what's in the jet boat now, but use that one.

The Toro used different accessory brackets than the RWD cars. Also, the 64-67 motors used brackets that had some differences from the 68-up motors. I assume you'll just use what's already in the jet boat now.

Olds used different length water pumps. A/C and HD cooling pumps were longer than non-A/C pumps. The pump, pulleys, and brackets must be used as a matched set. If this boat installation uses a flat front cover with a remote water pump then this doesn't apply.
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Old 10-29-2007, 03:20 PM
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Thank you all Danny
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