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Old 07-13-2006, 10:51 AM
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302, 327 or 350?

This has been giving me a hell of a time, I bought a stock car(dirt oval) a while back for $500 with the intention to put a new body on ang go racing. Well I lost interest in it and pulled the motor, 4speed and 9" to put it in my camaro.

Well I tore the motor down just to check all is well. I found a few interesting things on tear down, scat fordged crank, trw fordged pistons, scat fordged rods, big comp cam and a pete jackson gear drive. Big bonus for the $500 buy! The thing that has been confusing me is the date code and block casting number, casting # is as follows 3970010. Shows up as 69' 302, 69' 327, or 70'-80' 350. I dont have the date code handy but I cant seem to get a clear read on it so its still up in the air if its a 302, 327 or a 350.

My question to all of you is there any big diffs to the naked eye to identify if my block is one of these? I need to have the block cleaned and dont want to have the machine shop steal my block if its a 327 or a 302. Sorry for the lenghty post just wanted to get all the info out to ya. Thanks guys.

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Old 07-13-2006, 11:39 AM
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Highly doubtful it is a 302 ...
but if it is ... it should have DZ ... in the last letters ... here ... It should be a 4 bolt main also. If it is a 4 bolt main ... it is not a original 327 block.



The date code is a big help ... also post the letters on the pad ( photo shown ) and that will tell you too ...

I always take a engraving tool and mark my stuff ... if I take it to a machine shop ... on something that is not removable ... just to keep them HONEST ...
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Old 07-13-2006, 11:39 AM
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That's your basic, large main journal, 4" bore block. Displacement depends on stroke. 302 would be 3", 327 would be 3.25" and 350 would be 3.48". Check the stroke on your to see what it is.

Bob
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Old 07-13-2006, 11:56 AM
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Quote:
Originally Posted by Deuce
Highly doubtful it is a 302 ...
but if it is ... it should have DZ ... in the last letters ... here ... It should be a 4 bolt main also. If it is a 4 bolt main ... it is not a original 327 block.



The date code is a big help ... also post the letters on the pad ( photo shown ) and that will tell you too ...

I always take a engraving tool and mark my stuff ... if I take it to a machine shop ... on something that is not removable ... just to keep them HONEST ...
Ok, you just solved my question. I know that it doesnt have DZ in the code and it is a 4 bolt block, reads something like TTY in the code you posted a pic of. I think now that TTY designates truck? Thanks guys, I knew I wasnt that lucky for $500!!
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Old 07-13-2006, 01:03 PM
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How can you consider yourself unlucky?! You got a 350 with forged crank, rods, pistons, gear drive, etc PLUS a stock car for $500.00!!!!!

We should all be so unlucky!
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Old 07-13-2006, 01:06 PM
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Just un-lucky on the DZ possibility!! I got a steal of a deal, I bought the car from the guys brother. He just didnt want it on the prop any more! On another note, some of the cylinders had cross hatch in them from the hone!
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Old 07-13-2006, 02:11 PM
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Quote:
Originally Posted by Deuce
Highly doubtful it is a 302 ...
but if it is ... it should have DZ ... in the last letters ... here ... It should be a 4 bolt main also.
Not all 302 DZ blocks were 4 bolt, most were 2 bolt. I was in possession of three DZ blocks within the last 20 years and none were 4 bolt.

Vince
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Old 07-13-2006, 02:15 PM
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Quote:
Originally Posted by 302/Z28
Not all 302 DZ blocks were 4 bolt, most were 2 bolt. I was in possession of three DZ blocks within the last 20 years and none were 4 bolt.

Vince
Correct me if im wrong, but werent only the 69' DZs 4 bolt mains?
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Old 07-13-2006, 03:38 PM
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Some of the early 69 Z/28's, built late 68, used left over 68 engines which were 2 bolt large journal. When Chevy finally used them up, then the DZ got 4 bolts.
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Old 07-13-2006, 04:36 PM
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Quote:
Originally Posted by 302/Z28
Not all 302 DZ blocks were 4 bolt, most were 2 bolt. I was in possession of three DZ blocks within the last 20 years and none were 4 bolt.

Vince
If it was most anyone else but Vince ... I was be real doubtful ...
I have owned 6 or 8 DZ blocks in the course of the last 37 years and have never seen a 2 bolt DZ block . A 2 bolt MO 302 block ... yes ... I have one now ... and the aluminum intake that goes with it ...

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Old 07-14-2006, 08:57 AM
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the 39700101 casting number came in both 2 bolt and 4 bolt if I remember right. It`s just the standard 4" bore large journal block that the 302,327 or 350 could have been based on. If you got a Scat crank then it`s not a 302 and probably not a 327 either. I can`t remember if they make a 327 crank but regardless, you got a hell of a deal to get not only that motor but the tranny and rearend for $500. I had almost $600 inot just my Scat cast stell crank and 4340 I beam rods. I would`nt be disappointed at all.
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