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Old 05-28-2002, 07:06 AM
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Question Olds 425

Hello All,

I have just aquired an Olds 425 "A" casting (1965 I think), and was wondering whether it is worth doing over to get some serious ponies out of. If it is possible, who, how and where? The problem is that I reside in South Africa so will have to import everything from the States. Any suggestions?

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7litreclub.


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Old 05-28-2002, 05:20 PM
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Olds guys need to wright you on this because im really a chevy guy, but i beleave it would be a exspensive motor to build up. why dont you order one of those big books from PAW and get a idea of cost from that. Good luck 7Litreclub!
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Old 08-23-2002, 10:19 AM
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olds guy here to help. I've got a 72 cutlas with a 455. mildly built. The 425 for all intents and purposes is a very good engine. Especially a block produced from the late sixties. in most cases a built 425 will run neck to neck with it's 455 counterpart. Two of the most valuable resources for the olds power crowd would be to check out two companies website's. <a href="http://www.mondellotwister.com" target="_blank">www.mondellotwister.com</a> and <a href="http://www.dickmillerracing.com." target="_blank">www.dickmillerracing.com.</a> Joe Mondello and Dick Miller are probably the two premier engine builders out there for olds engines. Legends in the drag circles for there olds powered race teams. Seen them do a lot of 425 build ups. Not quite sure what your looking to do, but hope these resources might help.
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Old 12-14-2002, 05:45 PM
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The 425 will run neck-and-neck with a 455, and in many cases, may run quicker. Lots of folks don't know that. The very best Olds performance site on the internet is realoldspower.com There are many members there running 9-second cars, with a couple in the 8's, and a couple dragsters in the low 7's. These guys know their stuff...
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Old 12-15-2002, 12:12 AM
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Along with the other guys the 425 is a block accually worth looking at. I know Hurst Hairy Olds made his car with the 2 engines with two 425 blocks. Those were however supercharged but hey if it worked for him who knows what the possibilities are.
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Old 12-16-2002, 07:30 AM
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In my opinion the 425" is one of the best Olds engines for high performance applications. The stroke is shorter than the 455", which gives it just a tick more rpm capability. Since valve size and port size and shape is a limiting factor with Olds heads the 425" seems just the right size for the stock heads. We used to build a lot of 425" Olds engines for flatbottom boats, both jet and v-drive applications. These engines are hard to beat for torque output at low and mid-range rpm.
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Old 12-22-2002, 09:36 AM
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Hop on over to realoldspower.com
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Old 12-26-2002, 06:45 PM
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I had a '67 Delta Custom 10.25:1 4bbl and it was the single best running car I've ever had. The cranks on those are all forged, and all the blocks display top-notch metallurgy.
The 425s take different cams that a 455. Mondello is your best place to go. If you ant to get wild, check the lifter diameter: if it takes the big lifters (.951?), you can swap in a set of Diesel or late 307 roller lifters and use a roller cam.
Godd luck,
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