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Author Topic:   Biggest Stroke Crank in a GM 350 Block
Dirt Roller

Total posts: 23
posted July 24, 2005 08:07 PM  
What is the biggest stroke crank you can put in a GM 350 block?

Dirt Roller

Total posts: 23
posted July 24, 2005 09:06 PM  
I'm looking for the biggest stroke crank that requires little or no estra machine work.

sc1 racing
Dirt Freak

Total posts: 419
posted July 24, 2005 09:49 PM  
that would be a 434 so far..

Dirt Freak

Total posts: 209
posted July 25, 2005 02:26 AM  
as far as i know, from the few that i have seen, 3.750 (standard 400 sbc stroke) is as long as you will get in there and that will require significant grinding for clearance around the pan rails and bottom of cylinder walls.
the 3.750 crank is what is commonly used to in a 350 block to achieve 383cui.

[This message has been edited by rocket36 (edited July 25, 2005).]

Dirt Roller

Total posts: 23
posted July 25, 2005 03:43 PM  
Anyone ever put a 3.875 crank in a GM 350 block?

the king
Dirt Full Roller

Total posts: 46
posted July 27, 2005 12:37 PM  
we have a 3.75 turned down to a 2 in journal offset to a 3.80 seems not turn up as quick maybe we need more gear it comes on at half track

Dirt Newbie

Total posts: 3
posted July 31, 2005 10:10 PM  
Scat makes a crank that will fit in a 350 block with just a little cutting at the back of the block. its a 3.75 stroke. and they also make a 4.00 for a 350 as well.

Dirt Maniac

Total posts: 111
posted August 07, 2005 08:10 AM  
I built a 395 SBC using a 3.875" stroke crank from Race Engineering in FL. I like the motor, but you really have to work to find a cam it likes. Comp Cams had two tries at it and it never performed. The problem was my gear, really. To get the most out of the engine, you gotta use a lot of cam. Now the cam won't come in without a lot of RPM. I built the stroker, so I wouldn't have to run 7000 RPM like the 355's but turns out I have to anyway. BTW, the guy that balanced my motor HATED the crank. Don't know why, he just told me NEVER to bring him another. So if you go with the 3.875, make sure the engine balancer, knows what he's doing. Good luck.

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