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 Blocks / Cranks/ Rods and Pistons
 350 crank
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phil400
Cochise

Canada
456 Posts

Posted - 11 Jun 2016 :  11:16:10 AM  Show Profile  Reply with Quote
Can I use a 350 crank in a 400?

78T/A 4-SPEED Marty blue 400/milled 6x-4's/268H,comp roller tip rockers/ performer Q-jet/RA manifolds 2.25" exhaust with x-pipe/ mine since '99 3rd & final owner as long as I'm alive
"sometimes I do what I want to do,rest of the time I do what I have to"

Steve C.
Crazy Horse

1674 Posts

Posted - 11 Jun 2016 :  12:10:54 PM  Show Profile  Reply with Quote
Does this mean yes ?

"Stock Pontiac iron cranks can handle anything you throw at them if properly prepped. The 326, 350, 389, and 400 Pontiacs all share the same 3.75-inch stroke, and a crank from one of these other engines works in a 350 if rebalanced. When swapping cranks, be aware that there are three different crank flywheel-mounting flange pilot diameters - '63-and-earlier, '64-'76, and '77-'79--which must mate with a matching flywheel or flexplate."

Source: Hot Rod magazine article on a Pontiac 350


http://www.pontiacpower.org/PontiacCranks.htm

Parts interchangeability
http://www.crankshaftcoalition.com/wiki/Pontiac_V8_engine#Parts_interchangeability

Generally speaking, cranks with the same main journal sizing freely interchange, but there are some slight differences that can affect it (covered later in this chapter).

http://www.pontiacdiy.com/pontiac-v-8-crankshaft-performance-guide/

The only difference between a 350 and a 400 shortblock is the bore. So the rest can be 400 parts, just not pistons and rings.

http://www.jalopyjournal.com/forum/threads/pontiac-engine-rebuild.188616/

Edited by - Steve C. on 11 Jun 2016 12:27:34 PM
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Phil
The Great White Buffalo

USA
7215 Posts

Posted - 11 Jun 2016 :  3:51:22 PM  Show Profile  Reply with Quote
Yes if you are balancing the assembly. A lighter rotating assembly is achievable with this crank as long as attention is given to piston and rod selection. But I doubt you'd ever notice the slightly lighter crank.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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phil400
Cochise

Canada
456 Posts

Posted - 11 Jun 2016 :  5:47:30 PM  Show Profile  Reply with Quote
Great news thanks guys, I've decided to build up another engine and put my match # block safely aside, I found a 988 block locally which are impossible to find here, but it had no crank, its in great shape and I have a crank from a 350,so now Im good.

78T/A 4-SPEED Marty blue 400/milled 6x-4's/268H,comp roller tip rockers/ performer Q-jet/RA manifolds 2.25" exhaust with x-pipe/ mine since '99 3rd & final owner as long as I'm alive
"sometimes I do what I want to do,rest of the time I do what I have to"
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