| cadillac 425 [message #265636] |
Sat, 08 November 2014 09:35  |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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I've seen several Cadillac 425 engines hang around on Craig's list for months for not much money. Seems like the engine isn't in much demand when 472 and 500s are also around but for 2 to 3 times the money. The 425 could be a cheap swap to bring a dead GMC back to life.
I imagine the same tricks used on the 500 could also be used on the 425 to bring its output up to 400+ ft lbs and 200+ HP. The swap should also be about the same effort as as 500 as the engine externals are similar.
Just a thought...
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: cadillac 425 [message #265680 is a reply to message #265636] |
Sat, 08 November 2014 19:05  |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Yes!!Some folks like a 403 over a 455 cause gas.A 425 would be similar and cheap and plentiful.
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: cadillac 425 [message #265690 is a reply to message #265680] |
Sat, 08 November 2014 20:56 |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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The 368 and 425 are gutless wonders and I question their durability in a motorhome application. Also consider that a number of weight saving measures were taken with the 425, probably compromising integrity of the motor. Not sure what they were, but windowed main webs, reduced crankshaft counterweights, thinner walled blocks. etc. come to mind. 472s and 500s are built like tanks.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
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| Re: cadillac 425 [message #265729 is a reply to message #265636] |
Sun, 09 November 2014 11:34 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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That reputation is most likely why they're available for cheap.
Its not a common hot rod engine.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: cadillac 425 [message #265751 is a reply to message #265729] |
Sun, 09 November 2014 23:16 |
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Bill Freeman
Messages: 122
Registered: March 2004
Location: Colerain, NC
Karma: 1
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A 425 Oldsmobile engine from a 66 or 67 Toronado would be a much better choice than a 425 Cadillac. The main difference from a 455 is shorter stroke and they seem a lot less prone to rod bearing failures than the longer stroke 455. The 425 also has a forged crankshaft. Heads are interchangeable between a 455 and 425 Olds so you could lower the compression ratio if desired on the 425 by using 455 heads. If anybody wants a 425, I have a few on hand.
Bill Freeman
78 Royale 73 Sequoia
Colerain, North Carolina
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