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I was wondering if any of the motorheads here have any knowledge or know anything about putting a 4" crank in a 350 block with a standard deck.
A guy at one of the machine shops told me how they have done several 4 by 4's , as they call them. I didn't pay it much mind at the time .

But I missed out on a 400 block on ebay the other day. I also looked at a another 400 block at a second machine shop that was being made into a 434. He told me the compression height on the required pistons was only about 1 ". Thats WAY too short of a piston for me.

So I wondered if any one might have any good tech info on a 4" crank install. Can it be done with a 6.0 rod for instance?

thanks Jeff
 

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I think that would be extremely hard to do without a VERY short piston, get a 4" stroke on the crank I mean, especially with a 6" rod. Even for a 383 stroker the stroke is only 3.8", and the block has to be notched for that.
As for the crank out of the old Camaro 302, that is only a 3.0" stroke, that is why it rev so fast, the short stroke and the same 4" bore of the 350 that normally has 3.48" stroke on the crank.
Good luck!!
 

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imzz4 said:
I was wondering if any of the motorheads here have any knowledge or know anything about putting a 4" crank in a 350 block with a standard deck.
A guy at one of the machine shops told me how they have done several 4 by 4's , as they call them. I didn't pay it much mind at the time .

But I missed out on a 400 block on ebay the other day. I also looked at a another 400 block at a second machine shop that was being made into a 434. He told me the compression height on the required pistons was only about 1 ". Thats WAY too short of a piston for me.

So I wondered if any one might have any good tech info on a 4" crank install. Can it be done with a 6.0 rod for instance?

thanks Jeff
Jeff

388 cubic inch small block is a 400 crank with .060 overbore in a 350 block. The rod angle changes so you should get the correct rods. I have done several 388 and 383 like Joe's. Standard deck is correct. The rods are just a little shorter. Summit has a kit that has been turned down. The crank journals in a 400 is bigger than a 350 and will need to be turned down to fit the 350 block.
Summit part number is ESP-B13005E060.

Adrian
 

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RayO said:
I think that would be extremely hard to do without a VERY short piston, get a 4" stroke on the crank I mean, especially with a 6" rod. Even for a 383 stroker the stroke is only 3.8", and the block has to be notched for that.
As for the crank out of the old Camaro 302, that is only a 3.0" stroke, that is why it rev so fast, the short stroke and the same 4" bore of the 350 that normally has 3.48" stroke on the crank.
Good luck!!
I stand corrected.
thanks
stu
 
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