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Old 05-06-2012, 10:04 PM
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My new hotrod Nova, 327 question

So im working on my latest rod, 63 nova. The guy who sold it to me said it had a stroked 327. I just pulled my trans and noticed an externally balanced flexplate. So now im wondering what really have because I thought externally balanced flexplates were on 400 cranks. What cranks do guys use for a 327 stroker?
thanks
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Old 05-06-2012, 10:46 PM
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If it's not shaking itself to death then it's probably a 400, does it have 3 freeze plugs on the sides of the block or just 2? The only way to stroke a 327 is by an aftermarket high dollar crank.....or if it was a late model (68-69) 327 that would have a large journal crank and a 350 crank would fit. By all standards you would then just have a 350...not really a "stroker". What is the block casting number at the left rear?
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Old 05-07-2012, 12:32 AM
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Quote:
Originally Posted by swp1983
So im working on my latest rod, 63 nova. The guy who sold it to me said it had a stroked 327. I just pulled my trans and noticed an externally balanced flexplate. So now im wondering what really have because I thought externally balanced flexplates were on 400 cranks. What cranks do guys use for a 327 stroker?
thanks
If you have a 327 block with a 3-3/4" stroke crank, you have a 377 SBC, or 383 if it's been bored 0.030" over. It would be basically the same thing as a 2-bolt 350 w/a 3-3/4" stroke crank installed in it. Most times it would just be called a 2-bolt 377/383, though, and not a "stroked 327".

In all probability the block is a '68-up 327 having the large journal crank, although it's not entirely outside the realm of possibility to have a small journal block w/a 3-3/4" crank in it. That said, I personally wouldn't want to use that combination- the main journals are too small IMO.

Find the casting number of the block, the suffix code if it's still there, along w/the date code. That will tell you what the journal size is.
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Old 05-07-2012, 02:37 PM
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There three different journal on a Small Block Chevy. Small, Medium, Large. From 55 to 67 they small size
From 68 on up They medium
Only the 400 gets the large journal size.
To stoke a 327 to a 377 or 383 The crank would have to be cut to size. And have a off balanced 400 Harmonic balancer and externally balanced flex plate or flywheel.
Only 68 & 69 302/327 were medium size journal, and from 67 on up, All 350 blocks were medium size journal.

Last edited by lg1969; 05-07-2012 at 02:43 PM.
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Old 05-08-2012, 04:51 PM
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I found the casting number in the back of the engine, a little hard to read it.
( 3970010 ) also found ( 40 ) under the fuel pump ( H11 ) on the back side. I looked these numbers up and found 1968 327 or 1968 350. Now im evan more confused and still wondering why this flexplate is weighted! The heads have the classic camel hump and the only number i found is 20127.
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Old 05-08-2012, 05:01 PM
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It could be any of these. 3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4



Cole
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Old 05-08-2012, 06:08 PM
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So can you get the suffix code? If the block hasn't been decked, it's stamped on a pad in front of the passenger side cylinder head. But that won't tell you what crank is in it...
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Old 05-08-2012, 08:01 PM
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Quote:
Originally Posted by 68NovaSS
So can you get the suffix code? But that won't tell you what crank is in it...
Yup X2.


Cole
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Old 05-08-2012, 08:28 PM
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Quote:
Originally Posted by swp1983
So im working on my latest rod, 63 nova. The guy who sold it to me said it had a stroked 327. I just pulled my trans and noticed an externally balanced flexplate. So now im wondering what really have because I thought externally balanced flexplates were on 400 cranks. What cranks do guys use for a 327 stroker?
thanks
Back to your original question...

In recent years, I have seen many projects that use a 383 inch SBC. I remember hearing it was the use of the 400 crank in the smaller inch block casting.

A 383 is a 302, 327 or 350 block casting... with a machined 400 crank dropped in... or the Scat product crank... which according to google, is also externally balanced, like the 400

That would explain the balance weights, since that term refers to the special balancer and flywheel that has "counterweight" built into them.... and it matches the story of the guy you got it from.

Now the only question would be "which block?" ...not that it really matters.

BTW... I built a 331 inch (punched out 327) '63 Nova hardtop in about 1970. My wife hated that car, because it was going sideways most of the time I had it!!! :-)~

Last edited by TucsonJay; 05-08-2012 at 08:34 PM.
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Old 05-08-2012, 08:29 PM
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nope the numbers are already gone. Well, I will be dropping the oil pan in a few months for a new gasket. Maby i will be able to id the crank. As long as this engine runs good, i guess it doesn't matter. Till my next mill I will not know exactly what is in there!
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Old 05-09-2012, 07:38 AM
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Look behind the alt. There is a pad on the block the last two or three suffix letter will tell you what it is and where it goes.
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Old 05-15-2012, 08:40 PM
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grrrrr! Just pulled the balancer. So this motor has a neutral balancer and a 400 flexplate. Could this be possible? I was told this motor is a 327 stroker( what ever that means and last owner has no specific info). My local engine shop said, it may be unlikely, but there may be mallory metal in the front of the crank. They said this engine should shake like crazy. Well it had a slight vibration and only at certain rpms. Anyways im putting the this thing back together, got my rebuilt t350 back and new Hughes converter. If this thing shakes I guess I will pull the engine to see what is really there!
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Old 05-15-2012, 08:56 PM
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Quote:
Originally Posted by swp1983
grrrrr! Just pulled the balancer. So this motor has a neutral balancer and a 400 flexplate. Could this be possible? I was told this motor is a 327 stroker( what ever that means and last owner has no specific info). My local engine shop said, it may be unlikely, but there may be mallory metal in the front of the crank. They said this engine should shake like crazy. Well it had a slight vibration and only at certain rpms. Anyways im putting the this thing back together, got my rebuilt t350 back and new Hughes converter. If this thing shakes I guess I will pull the engine to see what is really there!
You can use a piece of stiff wire a foot or so long to put down the plug hole. Mark it at TDC, turn the crank until the piston is at BDC and mark the wire again. The measurement won't be exact but will tell you about what the stroke is, and it will be plenty good enough to tell a 3-1/4" stroke (327) from a ~3-1/2" (350, actually 3.48") or 3-3/4" stroke crank.

The only way it should need an externally balanced flexplate is if the stroke is 3-3/4". If it's a 350 or 327 stroke, put a neutral balanced damper and flexplate on it. If it's a 3-3/4" stroke crank, use the same flexplate and you could try a 400 damper to see if the vibration you had goes away.
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