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Old 02-04-11, 11:42PM   #1
mike623
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Default Please help me decode my block

Hi, I am new to this forum. I am in the middle of making a nice street-able hot-rod out of my 79 formula. I am putting a 78 nose on the front. I currently have the car down to metal and the front clip off. I was going to swap the 400 out and put a cheby motor in it but decided if the 400 was worth rebuilding I would stay Pontiac. I recently rebuilt my 350 rocket in my 72 cutlass. I just enjoy having Oldsmobile's or Pontiac's since everyone I know plays with chebys.
Anyways I pulled some numbers from the engine I wanted to see if you all could help me decode and figure out what exactly i have.
Here are the numbers.
407183 YH - This is from front of block under the head on passenger side.
24X143413 - This is from front of block next to timing cover on passenger side.
L133 - This is located next to distributor.
481888 - This located on rear of block on passenger side by head.

When I bought this car 5 years ago I was told this motor was out of a 78 trans-am. I doubt it though.
Thanks in advance, Mike.
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Old 02-04-11, 11:52PM   #2
DocsTA
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Try Wallace racings website. There is a decoder section.
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1979 Trans-Am Turbo Charged 535 IA2,
CV 1 heads with convertible exhaust option. 305cc, flowing 405cfm with mild intake port clean up


1979 Silver Anniversary 4 speed, numbers matching.
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Old 02-05-11, 12:33AM   #3
mike623
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Possibly 73 or 74?
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Old 02-05-11, 03:03PM   #4
BearGFR
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Quote:
Originally Posted by mike623 View Post
Hi, I am new to this forum. I am in the middle of making a nice street-able hot-rod out of my 79 formula. I am putting a 78 nose on the front. I currently have the car down to metal and the front clip off. I was going to swap the 400 out and put a cheby motor in it but decided if the 400 was worth rebuilding I would stay Pontiac. I recently rebuilt my 350 rocket in my 72 cutlass. I just enjoy having Oldsmobile's or Pontiac's since everyone I know plays with chebys.
Anyways I pulled some numbers from the engine I wanted to see if you all could help me decode and figure out what exactly i have.
Here are the numbers.
407183 YH - This is from front of block under the head on passenger side.
24X143413 - This is from front of block next to timing cover on passenger side.
L133 - This is located next to distributor.
481888 - This located on rear of block on passenger side by head.

When I bought this car 5 years ago I was told this motor was out of a 78 trans-am. I doubt it though.
Thanks in advance, Mike.
L133 - Date code. Your block was cast on December 13, 1973. So it was either a very late model year 1973 or an early model year 1974.
481888 - Block casting number - I didn't find this number, are you sure it's not 481988? If so, that would identify it as a 400.
YH - Engine code - Not used in model year 1973, but in model year 1974 indicated a 2-bbl 400, therefore your block was originally a 2-bbl 400, model year 1974.

24X143413 - This is going to be the trailing part of the VIN of the vechicle the engine came out of. On a "numbers matching" car, this number will match the VIN.

I got all the above information from these two web sites (it's always good to check multiple sites, people do make mistakes).
http://www.teufert.net/identify/identify.htm
http://www.pontiacpower.net/castnum01.html

Bear
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Old 02-05-11, 09:49PM   #5
mike623
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Bear GFR thank you. You are probably right about it being 481988. It was kind of hard to tell when I got that number off the block. I would like to make 400 to 550hp out of this motor. Will that be realistic? Would that block handle it? From reading around I gathered some blocks are stronger than other.
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Old 02-06-11, 07:18PM   #6
LS2GTO
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Check the sides near motor mounting pad (area)

Should have either a 400 or 455 cast near freeze plugs for quick ID.
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Old 02-07-11, 11:04AM   #7
mike623
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It is definitely a 400 is has the 00 on the side of the block.
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Old 02-24-11, 12:47AM   #8
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Quote:
Originally Posted by mike623 View Post
Bear GFR thank you. You are probably right about it being 481988. It was kind of hard to tell when I got that number off the block. I would like to make 400 to 550hp out of this motor. Will that be realistic? Would that block handle it? From reading around I gathered some blocks are stronger than other.
That power level is definitely doable if you build it as a stroker. One of the more common is using a 4.250" stroke crank with a +0.035 bore (4.155) for a 461.

Bear
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