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Author Topic: Identifying engine blocks  (Read 1721 times)

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Offline BBB

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Identifying engine blocks
« on: July 05, 2005, 03:45:02 pm »
Ok, so this should be simple.  I want to build a new engine for my truck.   179rwhp doesn't cut it.  I cut killed by any diesel on the road, and even the little trucks can pull more than me.  An easy solution would be to buy a new truck, but I don't have a $50,000 money tree.  So....

I am building a 383/mini-blower combo.  It will give me amazing torque for towing and great power throughout the curve.  I MUST start off with a 4 bolt block.  I have my eye on one in the junkyard that is sitting in a 1970 Chev truck.  HERE IS THE TECH QUESTION:  all truck blocks (of that era) are 4 bolt blocks right?  I can get it for cheap to start the build.  I really want to do a project that starts by rescuing a block from the boneyard.

BBB
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Offline Rockin C Racing

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Re: Identifying engine blocks
« Reply #1 on: July 05, 2005, 03:53:17 pm »
No not all truck blocks of that era are 4 bolt mains.  I don't know which years or how it would be determined which ones were 4 bolt or not, but from experience, I have helped friends rebuild their matching numbers truck engines and they were not 4 bolts.  But the catch here is that the two in reference 1) 1966 Chevy 1/2 2x4, 2) 1967 GMC 1/2 2x4.  So it might be said that 4x4 got the 4 bolts.
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Lotsa Toys

FIREHAWK37

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Re: Identifying engine blocks
« Reply #2 on: July 05, 2005, 04:38:16 pm »
BBB one thing I was told about the older motors in trucks is, if it has a factory four barrell then it has a four bolt main. Dont know if it is true, but I have heard it more than once.
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Offline BumpaD_Z28

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Re: Identifying engine blocks
« Reply #3 on: July 05, 2005, 06:15:05 pm »
here is a GREAT site to identify casting #'s (block)... "I" always start with "010" blocks and just check to make sure it is a 4-bolt ;)

http://www.mortec.com/
...
http://www.mortec.com/castnum.htm

Examples:

3970010....350...69-80...2 or 4 bolt
3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970014....350...70-76...2 or 4

P.S. Just think this time your building an LT-1 ;) :D
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Dave Hoppie
1967 Camaro Rally Sport
1971 Suzuki TS125R
1982 Camaro Z28
1998 Chevrolet Z71
1999 YAMAHA Banshee
2002 Camaro Z28
2008 YAMAHA FZ1

Juddidiah

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Re: Identifying engine blocks
« Reply #4 on: July 05, 2005, 09:38:24 pm »
If that block falls through, I have one that I'll be willing to let go for very reasonable price.  :cheers:
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neat

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Re: Identifying engine blocks
« Reply #5 on: July 06, 2005, 05:32:56 am »
FWIW, my dad just bought a new truck for his construction company.  It's a 2005 Chevy 1/2 ton.  5 speed, V6, tilt wheel, cruise, and AC.  No other options.  He paid $11,500 for the truck and got a $1500 rebate.

I know a V6 truck probably won't do what you want it to, but a brand new truck can be had for a semi-resonable price.  If you call 10k for a stripped truck reasonable, lol.
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IROCnRoll

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Re: Identifying engine blocks
« Reply #6 on: July 07, 2005, 09:28:21 pm »
Quote from: FIREHAWK37 on July 05, 2005, 04:38:16 pm
BBB one thing I was told about the older motors in trucks is, if it has a factory four barrell then it has a four bolt main. Dont know if it is true, but I have heard it more than once.

I've scoured the junkyards for years and 9 out of 10 3/4 ton w/8 lugs will have the 4 bolt block. Also some more numbers 509/817 are 400 small block 2 bolts, 511 are 400 4 bolts,
Some more numbers for small blocks are 618 for late 60's early 70's, 379/207 for early 80's, 638/880 for 1 piece rear main H/R block 87-95. 
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