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  #1 (permalink)  
Old 09-07-2008, 11:00 PM
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327 large and small journal motors

Gentlemen

I was reading over several different posts on 327 small / large journal questions and started to get dizzy from all of the different responses. The only thing I got out of all of it is the only difference between a 327 and a 350 is the pistons and the crank. My questions are:

If I am going to utilize a 4 bolt main 350 chevy block, I assume I will need to use a large journal 327 crank and 327 pistons to turn it into a 327 motor? With 5.7 inch rods correct?

Also, I have a small journal 327 crank. I assume I would need a small journaled 307 or 327 block, with the 327 pistons and my forged small journal 327 crank to complete a small journal 327 motor (obviously with the 5.7 rods)?

Finally, do any of you know of any automotive source (on line or any hard copy document) that gives all of the different combinations that are possible to build small journal 327's and a large journal 327's?

I apologize for my ignorance on this. I haven't built a motor in more than 15 years so I've lost touch with all of the different combinations for the 327 motor (both large and small journal) and want to re-educate myself. Thanks in advance for your response.

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Last edited by 31 Ford Coupe; 09-07-2008 at 11:11 PM.
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Old 09-07-2008, 11:06 PM
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as far as i know 327 is a 350 with a crank out of a 283. large journal block can be made into a 327 using proper crank. Small journal block requires small journal crank but everything else should be the same
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Old 09-07-2008, 11:32 PM
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327 build

You would be better served to go the large journal route because of one issue:RODS! you can find all kinds of options for large journals and almost nil for small journal also the rod bolts are larger and stronger.
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Old 09-07-2008, 11:59 PM
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Both engines used 5.7" rods. The crank journals are different sizes of course,

The small 327 engine rods are getting harder to find and weren't noted for their exceptional strength. The plus is the cranks were all forged.

The large engine rods are the same as 350 rods. You can make a large 327 with a 327 or 307 cast crank, 350 rods, and 327 pistons, all in a 350 block.
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Old 09-08-2008, 03:30 AM
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Quote:
Originally Posted by yevgenievich
as far as i know 327 is a 350 with a crank out of a 283. large journal block can be made into a 327 using proper crank. Small journal block requires small journal crank but everything else should be the same
nope,you'll need a large journal 307 or 327 crank.
283 crank in a 350 will make a 302 with no oil pressure
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Old 09-08-2008, 06:39 AM
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you can use small journall crank in large journal block but you need to use bearing spacer
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Old 09-08-2008, 09:34 AM
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You can use large journal 307 connecting rods. They are same connecting rods used on a 350.
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Old 09-08-2008, 10:01 AM
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the 307 rod dont fit small journal crank
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Old 09-08-2008, 11:31 AM
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Quote:
Originally Posted by 31 Ford Coupe
If I am going to utilize a 4 bolt main 350 chevy block, I assume I will need to
use a large journal 327 crank and 327 pistons to turn it into a 327 motor?
With 5.7 inch rods correct?

Also, I have a small journal 327 crank. I assume I would need a small
journaled 307 or 327 block, with the 327 pistons and my forged small journal
327 crank to complete a small journal 327 motor (obviously with the 5.7 rods)?

I would get the main bearing spacers and put the SJ crank in the LJ block,
you might find someone that makes thick main beraings eleminating the need
for spacers. Scat sells good SJ rods, much stronger than stock. Then you
will need 327 pistons to make it all work.
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Old 09-08-2008, 12:09 PM
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your right about the 307 rods, But you can use a large journal 350 block which are more available then small journal block. Then use a large journal 307 crank and rods and all you need are 327 piston. Bore it out 30 overbore and will get 331cid motor using .030 327 piston.
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