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Author Topic:   casting # help....tough one!
longracing25
Member
posted April 19, 2004 07:57 PM
I got one of those "great mystery" engines tonight. He said he thinks it is a chevy 350. The block casting says "3970010", i checked Mortec.com...it didn't give a clear answer. it said it is either 1969 302 z28 block, a 1969 327 industrial and truck block, or a 1969-84 350 block. They can't even tell me the size, let alone the year! The heads that came with it (off by the way) said "458642", which i found out are 74-84 350 heads...but i have no idea on CC or valve size.....also do some 350 engines come with a 8" balancer on them? When i saw this one, i thought 400 for sure. I thought the 6.5" was on 350 engines...


dtd_93
Member
posted April 19, 2004 09:51 PM
i had a motor outta an 84 chev that had an 8 inch balencer and was the same casting as that donno what the heads where but the block was the same... and it was a 4 bolt main


waltonjr1
Member
posted April 19, 2004 09:57 PM
I found this same engine while walking through the wrecking yard, it was in a big box truck, same casting number with a big 8" balancer, I also thought it was a 400 until i looked up the number. Maybe someone on here can tell us exactly what this engine is.



longracing25
Member
posted April 19, 2004 10:02 PM
I'm going to go out and open it up right now. It would be great to find it is actually a 383 now! It looks like it has ben rebuilt..no piston ridges( pretty nice cylinders) and filter doesn't look very old. I'll check under timing cover for the 010 or 020 tin/nickel thing..and hopefully 4 bolt mains...


longracing25
Member
posted April 19, 2004 11:18 PM
Checked it out... i didn't get the timing cover off, but i noticed a stamped "010" and a "020" obove the oil filter on the block. I almost fell over... it is a 4 bolt main also. Crank has the number 3982442 on it. pistons look a hair over 4" wide with a tape measure anyway..lol. I popped a piston out, no numbers on it(overbore size maybe stamped inside)....Now if i can find out if that's a 400 crank...did i mention this was a free engine...


longracing25
Member
posted April 20, 2004 12:44 AM
I did notice a crank casting # at mortec.com, 3932442...maybe that's what i have, and not a 3982442.


77k
Member
posted April 20, 2004 05:17 AM
442 is a 350 crank. MEASURE HOW FAR DOWN IN THE HOLE THE PISTONS GO.


DEEDDUDE
Member
posted April 20, 2004 06:01 AM
That is a common late 70's thru mid 80's block and heads found in trucks. the heads are junk. the crank is cast, but it will hold up for a mild power plant. I have found the 8" balancer on the blocks with 4 bolt mains mostly, but not always. the 10/20 block you have should be a good one. I've got one with over a 1000 laps and it shows no wear in the bores. good luck


BK19
Member
posted April 21, 2004 07:15 PM
if you get me the suffix code on the right front of the motor in front of where the head is i can tell you what the block is anyway


longracing25
Member
posted April 21, 2004 10:38 PM
I saw 2 sets of numbers. one says:061189066 and i think the other says.. vo728txb


ruggs66
Member
posted April 21, 2004 11:35 PM
'75 Chevy 350
http://www.73-87.com/chevy_ids/scode8.htm




BK19
Member
posted April 22, 2004 04:41 AM
yes TXB is the suffix code and it is a 75-77 350 truck motor


jwracing48612
Member
posted April 25, 2004 07:20 PM
what is the block with the CKB prefix


BK19
Member
posted April 25, 2004 09:17 PM
could be 72-74 or 77 350 or a 88 305 you need to find the date code to be sure which it is


jwracing48612
Member
posted April 25, 2004 09:53 PM
the date code is k0321ckb


jwracing48612
Member
posted April 25, 2004 09:56 PM
where do i find the info on which one it is


longracing25
Member
posted April 25, 2004 11:03 PM
www.mortec.com


longracing25
Member
posted April 25, 2004 11:06 PM
www.chevymania.com is also great!


BK19
Member
posted April 26, 2004 09:19 PM
k0321ckb
that is not the date code, it is the suffix code, the date code is on the back edge of the motor where the trans bolts to, i have a book for my suffix code info the above mentioned site only have casting numbers


autoshop
Member
posted April 26, 2004 10:17 PM
thanks guys ill have to pull it back out just got it sitting in there to make sure everything fits ill see tommorrow what it is


jwracing48612
Member
posted April 27, 2004 01:57 PM
i pulled it apart there is a clock on the pass. side with a number on top the # is either 20 c 13 or 2 c 13 not sure is this the one and is it a 73 350 im going to pull oil pan off to check for a 4 bolt main also on the back of the block is 010 stamped on it is that good thanks jwracing


jwracing48612
Member
posted April 27, 2004 02:34 PM
the motor is 2 bolt main and the crank casting # is 3932442 any help will be appreciated thanks jwracing


longracing25
Member
posted April 27, 2004 09:03 PM
same crank i have in the block above..sorry, it's a cast crank.


longracing25
Member
posted April 27, 2004 09:13 PM
I really hit pay dirt on my mystery engine above. It was a freebie from a buddy who basically..picked it up from somebody else..stopped by my house and dropped it off. The heads were off, and it had been sitting in the corner of the first guys garage. My buddy had no clue, i told him it probably would have to be bored out..and he didn't even wanna spend the $ on that..lol. Like i said the "mystery engine" ended up being a 1975 truck block,4 bolt mains,"thick block"( .010 AND .020 stamped on block)...and it has a pretty fresh .030 bore. Block looks okay so far. One of the new .030 pistons had a hairline crack across the top, but the cylinder looks okay......


0six
Member
posted May 07, 2004 08:44 PM
kinda late but, anyways, the reason you got 302,327 or 350 is because they used the same block for each one. the 3970010 casting # in my book shows a 68-69 large journal 302,327,or 350 so the only way to tell is measure the stroke.

[This message has been edited by 0six (edited May 11, 2004).]

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