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10-28-2007, 12:32 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.
Last edited by gl0rywagon; 10-28-2007 at 12:55 PM. 
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10-28-2007, 02:16 PM
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Anyone know if they will bolt up?
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10-28-2007, 02:25 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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10-28-2007, 04:29 PM
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Tried that for some reason will now let me register.
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10-28-2007, 04:55 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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10-29-2007, 10:56 AM
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Quote:
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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10-29-2007, 02:20 PM
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Thank you all Danny
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