MFR403 aluminum small block Oldsmobile.
#3
Not factory, It was a few years ago. On one of the Oldsmobile forums. Can not find anything about it now. Yes it could be next to impossible to go bored 403 with steel sleeves.
#5
Olds made experimental aluminum 350 and 455 blocks in the 1960s primarily to support the CroSal CanAm race car project. Some of these blocks made their way into boats and other race cars (Garner's off-road car, for example). A handful are privately owned. These are not what the OP is asking about.
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72Supreme4Speed
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April 5th, 2022 01:58 PM