MFR403 aluminum small block Oldsmobile.

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Jul 21, 2022 | 05:00 PM

HighwayStar 442

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From: Laguna Vista, TX

MFR403 aluminum small block Oldsmobile.

Anyone know what happened to MFR403 aluminum small block Oldsmobile. That someone was working on? Not 215 ci

Jul 22, 2022 | 05:41 AM

olds 307 and 403

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From: Melville, Saskatchewan

I have never heard of an aluminum 403 block, it sounds like a disaster😁. Is it one of the factory experimental aluminum 350 blocks bored and stroked to 403?

Jul 22, 2022 | 07:04 AM

HighwayStar 442

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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.

Jul 22, 2022 | 07:36 AM

Hammerdrop

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Yeah, I saw that aluminum 350 in a car at one of the OCA shows a few years back. I even had to check it with a magnet. Crazy.

Jul 22, 2022 | 08:58 AM

joe_padavano

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Quote:

Originally Posted by Hammerdrop

Yeah, I saw that aluminum 350 in a car at one of the OCA shows a few years back. I even had to check it with a magnet. Crazy.

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.