SBC 400 crank in a 327? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-12-2008, 10:58 AM
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SBC 400 crank in a 327?

My little brother has a SBC400 and he is in the process of stroking it and boring it out. He was looking to sell the crank, rods and pistons but asked me if I wanted them instead.

I was curious could I use the 400 crank in the 327 block??? What about the rods?

What would the combination be? Would it make any power?

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Old 02-12-2008, 11:10 AM
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It depends...

if you have the Larger journal 327 then you could turn down the 400 mains and use it just like you would in a 350.

The bore and stoke list isn't coming up right now on Mortec and I can't remember what the particulars of the 327 are but...

It will be difficult to find a rod/piston combination that will get you where you need to be. You would probably end up re-using the 327 pistons and getting a set of custom length rods made.

So if you are willing to spend big bucks then it is possible. But the 400 crank may not actually fit into the 327 block, if you wanted to try, since he is getting rid of it anyways, have the mains machined to 2.450 and then set it in your block, put a set of rods on it and see if it will rotate.

My guess is probably not....and you will spend so much money that you could have bought a 383 shortblock fully assembled for the same price.
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Old 02-12-2008, 11:26 AM
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The 327 has a 4.000" bore just like the 350, so theoretically you could use 383 pistons. You would also have the choice of using the stock 400 rods with it or going with a 5.700" or even a 6.000" rod. You can buy pistons off the shelf for any of the three rod lengths.
Like Double said, I don't know if the block is cast any differently than the 350 block and have no idea if there is enough room in it to swing the 3.750" crank. In a 350 block, there is usually interference with one or more of the cam lobes at the bolt head on the rod and also at the pan rail. You'll also need to check clearance between the balance pad on the pin end of the rod and the underside of the piston crown.
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Old 02-12-2008, 05:34 PM
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CASTING#.....SIZE...YEAR...MAIN CAP BOLTS....NOTES

3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

Shane
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Old 02-12-2008, 05:55 PM
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400 crank

There should be NO more trouble putting the cut down 400 crank in a large journal 327 than there would be in a 350 block. There's even someone ( Speed-O-Motive ? ) that has a 383 strocker kit for small journal 327 blocks. You can use the 400 rods, the 350 rods, or the 6" aftermarket rod; you just have to get the correct pin height pistons for whatever rods are used. But, probably easier to buy a 383 aftermarket rotating assembly now that everyone makes them.
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Old 02-12-2008, 06:04 PM
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The 327 block is not relieved as much as a 350 on the bottom of the cylinders. It would take a LOT of grinding to achieve the clearance necessary for the rods to make the swing. I don't see any sensible way to make a 400 crank work in a small-journal 327 block and it's not much more sensible to put one in a large journal 327 block.

Save the 327 block for a 327 build. Sell the 400 crank to somebody who has a 400 and get a 350 stroker crank and a 350 block.

tom
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Old 02-12-2008, 06:44 PM
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Is this a forged crank?? Why would you want to waste your time grinding up a perfectly good 327 block just to stroke it with a crank you'll have to waste money modifying. You'd be dollars ahead to drop this idea quick. I agree with Tom, save the 327 block.
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Old 02-13-2008, 11:12 AM
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I was just curious whetehr or not it would be worth doing. Thanks for the help guys.
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Old 02-13-2008, 05:38 PM
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Only you can decide if it is worth doing. There are just cheaper, easier ways to make a 377 ci small block. If you decide to do it, I'm sure that we would all love to hear about the problems you encounter and the ways you overcame them.
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