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Old 09-27-2005, 03:17 PM
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Building 327 with 350 block?

Well i have gotten some real cheap parts and i was hoping to make a 327, but i have some questions.

First off the 327 crank i got needs to get machined and it needs to go 40 over to make it good again. Just so you know it is the large journal crank (don't know if it makes a difference) . i was wondering if this was safe to do or am i asking for trouble?

The second question is can i take that crank and pop it into a 350 block i have around? and if this is possible what else would i need to make this thing run? like special rods, pistons ?

thanks for the Help
John

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Old 09-27-2005, 03:58 PM
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At some point ya have to give up and buy a new crank. 0.040" is quite a bit on a stock crank, even if it is a large journal. You may be able to get away with it but I doubt that the heat treating is that deep on a factory crank.

The first crankshaft in the link below would take anything you ever wanted to throw at it.

http://www.ohiocrank.com/sbcCranks.html

There are other cranks that cost waaay more, like Eagle.

Eagle 3.25" crank from Summitt

You could always just make it a 350 or 383, $200 for the cast cranks from Eagle or Scat.

Larry
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Old 09-27-2005, 04:54 PM
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Yep, you can pop that crank into a 350 block to make a 327. You will have to use 327 pistons. 350 and 327 rods are the same length, 5.7" (stock rods).

.040" is a lot to go, if you have to go with another crank, a 350 would be a little cheaper to build, depends on what you want to end up with.

tom
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Old 09-27-2005, 08:16 PM
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Thanks for the input. just wondering because i was given the block and the crank so i was just wondering if it could be done. Well i will have to think about it because i don't want to spend tons of money. I was hoping that this would only be a trip to the machine shop to get the crank cleaned up. i don't need the motor, but i figured that a running engine would be better than a pile of parts.
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Old 09-27-2005, 08:21 PM
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A 307 crank is the same stroke as a 327 and will fit in the 350 block. 307 cranks are a heck of a lot easier to find than a large journal 327 crank. 68 and 69 327's were the only large journal motors. Reguardless of what combination you run have the rotating assembly balanced.
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Old 09-27-2005, 08:31 PM
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Quote:
Originally Posted by projectjohn
Thanks for the input. just wondering because i was given the block and the crank so i was just wondering if it could be done. Well i will have to think about it because i don't want to spend tons of money. I was hoping that this would only be a trip to the machine shop to get the crank cleaned up. i don't need the motor, but i figured that a running engine would be better than a pile of parts.
if u dont want to spend alot
find a 350 crank
and build yourself a motor
.040 is not going to leave u
with another rebuild on crank.
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Old 09-27-2005, 09:19 PM
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Yep, this will only work if the crank is from a large journal 327.

K
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Old 09-28-2005, 10:43 AM
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I'm not sure what the parts availability for undersized bearings are, but if I'm not mistaken, a large journal crank turned .040" undersized is still .060" larger than a standard Small journal crank..
JA
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Old 10-02-2005, 02:41 PM
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Quote:
Originally Posted by coldknock
At some point ya have to give up and buy a new crank. 0.040" is quite a bit on a stock crank, even if it is a large journal. You may be able to get away with it but I doubt that the heat treating is that deep on a factory crank.

You could always just make it a 350 or 383, $200 for the cast cranks from Eagle or Scat.

Larry
*******************************
[QUOTE]
from JA in # 8
re: Building 327 with 350 block?

I'm not sure what the parts availability for undersized bearings are, but if I'm not mistaken, a large journal crank turned .040" undersized is still .060" larger than a standard Small journal crank..
JA [QUOTE]


*******************************


Is this grinding particular to a big journal SBC, that .040 is too much?

Other brands get turned 80 and even 120 or more to fit small journal blocks. They also turn down big rod journals to fit BBC rods.
Is the SBC crank just that weak?
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Old 10-02-2005, 05:25 PM
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Got to look at the economics here.
A 350 is cheaper to build. a 350 will make more power than a 327.
good 350 cranks that just need a 10 10 regrind are plentyful.
If you use stock type replacement 350 pistons or same weight flat tops rebalancing your 350 is not nessessary.
Give the 327 crank to someone else and get a 350 crank.
With the money ya saved get some better than stock heads for the 350
(vortec, Dart, protopline,etc etc) You'll be way further ahead.
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Old 10-02-2005, 06:36 PM
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The Chevy crank can be ground to .040 or .050 with no problem. If your not running nitrous.
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