403 stroker crank

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Old Feb 14, 2020 | 02:38 AM
  #1  
dragline's Avatar
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403 stroker crank

Is there a stroker crank available for the 403? Has anyone done a big cube 403? Thanks
Old Feb 14, 2020 | 03:19 AM
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Old Feb 16, 2020 | 12:52 AM
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Can the crankshaft be purchased separately?
Old Feb 16, 2020 | 02:33 AM
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Originally Posted by dragline
Can the crankshaft be purchased separately?
Contact Mark. It's his crankshaft design.

https://classicoldsmobile.com/forums...utlassefi.html
Old Feb 16, 2020 | 06:28 PM
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Get in line....most of us are putting them in 350’s. Wasn’t going to risk a 403 knowing that had to girdle/fill the block. Nearly went DX but machining is too much money. A 4.185/4.25 small block with 2.5 mains would be golden.
Old Feb 17, 2020 | 07:53 AM
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Originally Posted by olds403
Get in line....most of us are putting them in 350’s. Wasn’t going to risk a 403 knowing that had to girdle/fill the block. Nearly went DX but machining is too much money. A 4.185/4.25 small block with 2.5 mains would be golden.
is there currently a source for a 4.25" SBO stroker crank or are you saying that 4.25" is what you see as optimal?
Old Feb 18, 2020 | 08:00 PM
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My comment was on the bore size of the block.
Old Feb 20, 2020 | 10:14 AM
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Originally Posted by olds403
My comment was on the bore size of the block.
My bad. I thought your 4.185 / 4.25 was a bore and stroke combination when you meant it as a bore range.
Old Feb 21, 2020 | 06:31 AM
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I suspect 4.25" stroke would be damn near impossible with the SBO short deck.
It appears most D/DX blocks can go to 4.185 without breaking a sweat. 4.250 bore is the upper limit of the good ones. But, all depends on what you consider acceptable wall thickness. The D block I have would have a single non-thrust thin spot at 0.140" @ 4.250".
Old Apr 21, 2022 | 07:13 PM
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Dammit Mark - You keep making me seriously consider a bigger cam and thinner head gaskets, then why not open up those head ports, and then that RPM in my attic should get opened up, then can I get my Qjet to keep up, and, and, and. I don’t wanna spend that money and do that much work but you keep on hanging out a bug light, it just keeps drawing me closer…





Last edited by bccan; Apr 21, 2022 at 07:17 PM.
Old Apr 22, 2022 | 05:14 AM
  #11  
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Sorry!!😎
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