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Old August 3rd, 2021, 05:51 PM
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403 Oldsmobile engine
Do you have to take the crank out to see if it swm engine??
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Old August 3rd, 2021, 05:52 PM
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No. You don't even need to remove the oil pan. They do NOT exist
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Old August 3rd, 2021, 07:31 PM
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Must have found Chris Witt's million dollar reward for one, ha.
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Old August 4th, 2021, 04:35 AM
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Bigfoot, he found Bigfoot! Expect a blurry picture without any of the casting numbers showing.
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Old August 4th, 2021, 05:37 AM
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Originally Posted by 66SportCoupe
No. You don't even need to remove the oil pan. They do NOT exist
^^^THIS. Just look at the outside of the block. If it says "403" on the sides, it is NOT a solid main web motor.
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Old August 4th, 2021, 08:14 AM
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Hope you didn't pay a lot for it.
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Old August 7th, 2021, 09:46 PM
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If it is an SMW then someone spent $$$ to have them welded up.

I am toying with the idea of dumping my 403 in favor of an LS with a 6L80E in my 54 88.
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Old August 8th, 2021, 04:36 AM
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I did a 455 for a guy in Melbourne AUS years ago running propane. It went in a ‘54 Holiday coupe I believe. Still driving it today. Keep it Olds.
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Old August 8th, 2021, 05:38 AM
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Originally Posted by Tango88
If it is an SMW then someone spent $$$ to have them welded up.
If you read the OP's other thread, he doesn't even have a 403. He has an early 350 block.
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Old August 8th, 2021, 06:31 AM
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How far can you safely bore a DX block for a NA application?
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