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Thread: Olds 425 rocket engine
          
   
   

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  1. 01-18-2004 04:55 PM #1
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    Matt167
    Matt167 is offline CHR Member
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    Olds 425 rocket engine

     



    I was just wondering if a 425 rocket engine is the same physical size as the Small block 350?
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  3. 01-19-2004 08:03 AM #2
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    Matt167
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    I was just wondering this because i always see the late 70's oldsmobiles that have the 425 rocket for like 400- 500 bucks.
    You don't know what you've got til it's gone

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  4. 01-19-2004 10:56 AM #3
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    OK, let me expand upon techs "NO". The 425 and 455 are Big block oldsmobiles. About 4 inches taller, 3 inches wider and somewhere around 150-250 lbs heavier with steel intake. Also, I believe your mistaken. The 425 ended production back in the late 60's, and was replaced with the 455. If Im not mistaken, the engine your looking at is the 403. It is the same size as the 350, and will swap over. However, this engine requires special care, as its a Large bore SB, and 99% of the time has webbed mains. Hope this helps.
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  5. 01-19-2004 11:20 AM #4
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    Matt167
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    This is very good information to know as is all information provided on this site. What does "Webbed Mains" mean.
    You don't know what you've got til it's gone

    Matt's 1951 Chevy Fleetline- Driver

    1967 Ford Falcon- Sold

    1930's styled hand built ratrod project

    1974 Volkswagen Super Beetle Wolfsburg Edition- sold
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