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jmagro,

Please post your parts wanted ad in the ad section available from the main chevelles.com page, not here in the tech forums. Thanks, Tom
 

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With all due respect, Rich, I think you probably mean they just didn't come from Chevrolet that way
. Someone could have had a block drilled for 4 bolt mains.

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Bill Pritchard
69 SS396 Convertible
"There's never enough time to do the job properly, but always enough time to do it over."
 

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Bill: Well, yes. Chevrolet never made a 4-bolt main 327 block.

JRL mentions a way to MAKE an engine that displaces 327 ci with 4 bolt mains by using a 4 bolt main 350 block, but it would still be a 350 block regardless. jmagro was asking for a 327 block.

I doubt jmagro would have much more luck finding a 327 block that someone has drilled for 4-bolt mains than he would finding a block that doesn't exist.


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[This message has been edited by Rich-L79 (edited 02-13-2001).]
 

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No, those are 302 blocks. 302 motors used cranks with the same stroke as the 283 and a bore the same size as the 327 to arrive at the 302 size. But a 302 block is a 302 block.

The 302 was a rather special little motor. Of course you can MAKE your own 302 by combining a 283 crank with a 327 block, but that doesn't make that block a 302 block.

Maybe I'm splitting hairs here, but then again maybe I'm not. A 283 block is a 283 block, a 302 block is a 302 block, a 327 block is a 327 block and a 350 block is a 350 block regargless of how it is used to make a (whatever the size) aftermarket engine.

I have a SB 400 with 350 rods because the 400 rods are junk. Just because the rods are in my 400 does not make them 400 rods (special offset pistons are required to make this swap by the way). The difference between a 350 rod and a 400 rod is quite a bit (length, bolt boss thickness, etc.) but the differences between a 327 block and a 302 block may be more narrow (casting dates, casting numbers, stamped numbers, etc.) but is still just as distinct.

Casting numbers are sometimes shared (one casting style produces more than one motor size) between motors (not always, but sometimes) but stamped numbers which identify what the motor is are NEVER shared between motors.

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<BLOCKQUOTE>quote:</font><HR>Originally posted by Rich-L79:
I doubt jmagro would have much more luck finding a 327 block that someone has drilled for 4-bolt mains than he would finding a block that doesn't exist.


<HR></BLOCKQUOTE>

Amen!


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Bill Pritchard
69 SS396 Convertible
"There's never enough time to do the job properly, but always enough time to do it over."
 

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I believe there may have been, I'll repeat may have been, a four bolt 327 in the VERY large truck series of 327s sometime in the sixties but I am not sure. There were no four bolt 327s in cars though. I can't confirm the big truck engines.
 

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jester,

my 69 Z 302 DZ code was not 3970010 casting, I forget now what it was but there were other 4 bolt 4" bore blocks.

Tom
 

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just for grins I dropped in to MOrtec.com to see. 302's were only built for 3 years and used 6 different casting numbers. I really find that strange, but here they are according to Mortec

389257 1967 2 bolt
3892657 1967 2 bolt
3914678 1968 2 bolt
3932386 1969 4 bolt but also used as a 327 2 bolt
3956618 1969 4 bolt, also as a 327 2 bolt and a 350 2 or 4 bolt
3970010 1969 4 bolt and as a 350 up to about 1980 both 2 and 4 bolt
Philip
 

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Philip
mine was a 3932386, I recognized the number as soon as I saw it. 386 is a number burned forever into the remains of my mind, but for another reason altogether.

Tom
 

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It's kind of a shame how the Chevelle Restoration manual we all own makes claim of an erroneous L79 327 4-bolt main block.
I actually own a 68 327 w/ 4-bolt mains. It came out of a 1968 Chevy bus. If anyone wants the codes, please feel free to let me know. I was amazed when I got it, for sure...



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Well,
Let me through in my $.02 here.

The small-journal 302 used the 327 block.

The large-journal 302 used the 350 block.

64elcamino

you left off the block with casting
# 3914678 a 1968 302 and 327 motor.

which I happen to own.

And the 67 and 68 302s are 2 bolt mains.

the 69 is a 4 bolt main.
In fact, i didn't think ANY small block prior to 1969 was a 4 bolt block. (passenger applications).


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Mr. D
72 454 El Camino
68 RS/SS Camaro
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[This message has been edited by Mr. D (edited 03-16-2001).]

[This message has been edited by Mr. D (edited 03-20-2001).]
 

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Never say never. Looks like the BIG truck and bus engines were in their own area as far as specs. I'm glad someone confirmed the 4 bolt 327. I wasn't completely sure. I saw a 283 out of an early sixties BIG truck and have yet to see another engine with the same casting identifiers on the ends of the heads. Instead of having a triangle on a large rectangle which is a common 283/327 head, it had a circle on top of the rectangle. Had a massive but factory looking oil pan and was painted green. The paint looked original.
 

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I'm no expert on engines, but i'll just state what i saw and was told. My dads good friend has his own shop and only works on older cars, and 327's are his favorite engines, he must have at least 20 of them. He has one in his bathroom covered up so knowone realizes its there, and its a 4 bolt 327. He won't part with it for the world because he says there extremly rare. He's been a mechanic since the 50's and his life is cars. I've told him that i heard there was no such thing as a 4-bolt 327 and he tells me there was and there vary rare, thats why you don't hear of them. I know some of you may think i'm crazy, but this guys been around chevy's for around 50 yrs, and he is a chevy nut, so i take what he says, with a lot of weight. We all know chevy did weird things in the 60's with cars and engines, maybe they did build a 4-bolt 327.

thanks,



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lucky3
1968 Malibu
My 68 Malibu
Dale Earnhardt always
 

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Just to toss a monkeywrench into the works....

So, what is a 307 then?

Just curious. This stuff fascinates me

K

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64 2 Door HT 6-230 and a 'Glide (In transit from Cali)
Formerly 71 Elco
 
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