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#1
03-12-2017, 10:31 AM
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Running the numbers on our 1971 LeMans Sport
I am running the numbers on a 1971 LeMans Sport 350.
Block Code 21A 130527- Pontiac, 1971, Atlanta, Engine number Block Casting 481990-71/72 350 Date Code B251---February 25th 1971 350 2 bolt main Intake Code 9794234-68/69 350 Qjet 1x4 Quadrajet Carb---7040262 XA 2629---1970, Federal 4 bbl, Pontiac, Automatic. XA---Casting plant 2629---Sept. 19, 1969 Found this piece of information regarding the numbers on the engine.. Pontiac engines have block code. This code will tell you the year it was to be used. However, these codes were used over from year to year. Together with the casting code and casting date you can determine what the engine is. Starting in 1965 Pontiac began using a 2 digit letter code. Above the 2 digit code will be the motor unit number, which is either 6 or 7 digits. It is important to note that it is not related to the VIN number. As a general rule, "W" coded blocks are manual transmission and "Y" coded blocks are automatics. And most of the "Z" coded blocks are also auto. The "X" coded blocks are a little of both. All engine blocks have a casting code. This code will tell you the year it was to be used. However, these codes were used for more than one year and could have different machining or even different main caps. Casting codes for 1955 to 1963 are found on the passengers side of the block. Casting codes for from 1964 to 1967 are found on the distributor pad, except the 421's. Casting codes for from March 1967 on are found on the rear of the block just behind the number 8 cylinder. Displacement ID's were cast in the side of the block starting with the 1968 428. A 428 was cast on the side of the block and in the lifter valley was a 28. In 1970 the 350 and 455 had their size cast in the side and a 50 or 55 in the lifter valley. The 400 also has the 400 on the side and 00 in the lifter valley, but not until 1971. Can someone tell me if I'm thinking correctly... My LeMans VIN number is 237371P116361 Engine Code is 21A130527 According to the info I found above the two numbers are not related. Confusing to say the least! Everything I have found leads me to believe this engine was meant to be installed in my car, but.....???... Thanks and I hope this helps some other with their questions about numbers.
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Kurt L71S....1971 LeMans Sport Coupe 350/TH350 
Last edited by Kurt L71S; 03-12-2017 at 10:46 AM. |
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#2
03-12-2017, 11:23 AM
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You have a 350 block, possibly block & heads, out of a '71 Lakewood (Atlanta) assembled Pontiac A-body. Lakewood plant built A-body's & GP's in '71 & '72. GP's did not get Pontiac 350 engines till '76, memory serves right.
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Buzzards gotta eat... same as worms. |
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#3
03-12-2017, 12:59 PM
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Quote:
I appreciate your input! I would like to think this is the engine that was installed at the factory, but all the info I find seems to contradict itself about having the VIN number and the engine code being the same. As far as the two being the same.....if that is in fact the "gospel".....My next thought could be that someone changed out the dash with another Lemans??? That would explain the VIN on the dash not matching the engine code....  I think I have put WAY too much thought into this.....All I know is I am going to have a beautiful 1971 LeMans Sport, 1989 Chevy Blue, 350 ci, with white interior that should turns heads.....   
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Kurt L71S....1971 LeMans Sport Coupe 350/TH350
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#4
03-13-2017, 09:37 AM
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How about these numbers I found on the TH350?...
 Left side 6260110 3 B3 Buick Transmission "VIN" 20P252990 Any help would be appreciated!... 
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Kurt L71S....1971 LeMans Sport Coupe 350/TH350
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#5
03-13-2017, 10:19 AM
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The 21A 130527 is not the engine code, it is the partial VIN of the car it originally came in.
Which appears to not be your car? The engine code is a stamped 2 letter code which is just below the passenger cylinder head. And below that 2 letters will be the engine unit number, which will be 7 digits stamped. The partial VIN on the tranny also looks like it is not the original transmission. 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#6
03-13-2017, 10:32 AM
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Thanks SOOO much John for all your information! I am learning so much Pontiac info....
Not used to this....I am or was a chevy guy having own 2 Camaros. I can't say enough how much I am in love with this 71 LeMans Sport! When done...She should be outstanding for a cruiser... Thanks again,
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Kurt L71S....1971 LeMans Sport Coupe 350/TH350
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