327 4 bolt main...did GM make this? - Team Camaro Tech
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post #1 of 36 (permalink) Old Aug 10th, 01, 01:52 PM Thread Starter
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Was a 327 4 bolt main ever produced by GM...I have seen several arguments about
this and am curious. Thanks.

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post #2 of 36 (permalink) Old Aug 10th, 01, 02:10 PM
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No - GM never made a 4-bolt 327 for production use; many have been drilled and tapped for six extra splayed bolts with aftermarket main caps on the #2-3-4 journals by machine shops, but GM never made one.

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post #3 of 36 (permalink) Old Aug 10th, 01, 02:20 PM Thread Starter
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Thanks, I argued and argued with a guy today about this. I tried to look it up on the net, but the details are sketchy. Thanks again.

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post #4 of 36 (permalink) Old Aug 10th, 01, 04:31 PM
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John,
What about the vette in 1968? The LT1 350 was four bolt main but in 1969. what about in 1968? Wasn't the hottest vette engine for 1968 the 327/365? and wasn't that possibly a big journal four bolt 327?
I know GM made a big journal forged 327 crank because I have one in my spare engine for the Lola.
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post #5 of 36 (permalink) Old Aug 10th, 01, 05:47 PM Thread Starter
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David, I can't find that engine in "Chevrolet by the numbers"...do you
have some more information on it?

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post #6 of 36 (permalink) Old Aug 10th, 01, 06:01 PM
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David--- The 68 Vette 327 was rated at 300 and 350 HP and produced as a 2 bolt. Block #3914678 they also used block #3914660 327 rated at 300 2 bolt also. 300 HP suffix is HE or HO while the 350 HP suffix would be HP or HT.
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post #7 of 36 (permalink) Old Aug 11th, 01, 09:27 PM
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Well, as I said above, I'm not real sure about the engine's horsepower, but I do have a book titled "The complete chevrolet book" that lists a 327/350 horse @5800 engine for 1968. It had 11 to 1 compression, and 360 ft lbs torque @3600.
I suppose this is what my large journal 327 crank was made for.
The 327 engine power level was dropped in 69, down to 235.
Jeff, any info on weather that engine (350hp) is a large journal?
Didn't GM change all SB engines to large journal from 68 on?
David

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post #8 of 36 (permalink) Old Aug 11th, 01, 10:53 PM
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i thought 307's were small journal- i think i read that somewhere.i have a 71 307 lying around, but have not popped the pan to investigate.but, to get back on the original subjrct, i don't believe they ever made a 4 bolt 327.again, just something i read...seems to me that they never saw the need for 4 bolts back then, at least until they started warrantying blown up 302's from the 67 model year.

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post #9 of 36 (permalink) Old Aug 12th, 01, 07:07 AM
 
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This stuff falls right in w/ my nephews medium jounal forged 283 w/ the -291 2.02"/1.60" heads on it. I know it is homemade but the block isn't a factory installed car block also its letters above the W/P doesn't come up, but I expect it is an over-the-counter 307 block w/ a '68 302 crank in it. It's real interesting because the little jewel has cast four notch F/T pistons in it that look stock. Maybe the short block is a stock over-the-counter '68 medium jounal forged crank TRUCK replacement block????? pdq67



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post #10 of 36 (permalink) Old Aug 12th, 01, 04:01 PM
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The 307 was a large journal engine. Personally other than value of an original engine in an old chevy with #'s matching I'd jerk the crank out slap it in a 350 and have good performing 327. To my knowledge chevy never produced a 4 bolt 327 to get back on the subject. The only ones I've seen were 350 4 bolts that they changed over.
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post #11 of 36 (permalink) Old Aug 12th, 01, 06:22 PM
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People used to put large journal 327 cranks in 4bolt blocks to make a stronger 327 the factory didn't ever do it.

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post #12 of 36 (permalink) Old Aug 13th, 01, 01:34 PM Thread Starter
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Thanks for all the replies...I guess it's safe to say that GM never produced a 327
4 bolt main, which is what the books I have
say, but every so often you run into someone who swears they have a factory 327 4 bolt main...and there is no talking them out of it. I'm sure everyone here has had a conversation or two with this type of person. Thanks.
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post #13 of 36 (permalink) Old Aug 15th, 01, 04:37 PM
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On my previous post on putting 327 cranks in a 4 bolt 350 block I meant individuals and not the factory. Read over my post and I wasn't too clear on that. Yes I know several people that will swear to their grave that they have or used to own a factory 4 bolt 327. I don't even argue. Just like the guy that told me he bought a 1979 firebird with a factory M-22 muncie. Yep he knows for a fact because he crawled up under it and saw the "M-22" stamped on the side of the transmission. UH-HUH
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post #14 of 36 (permalink) Old Dec 8th, 01, 10:43 AM
 
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The General did indeed build 4-bolt 327's...they were truck motors.

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post #15 of 36 (permalink) Old Dec 8th, 01, 04:12 PM
 
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OK, please post back the "Alpha" code that is stamped on the block with the VIN # above the pass. side waterpump block hole. Thx. pdq67



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