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#1
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Engine and head ID verification
I bought my LeMans last summer. I was told Cliff rebuilt the Quadrajet by the previous owner. After having carb issues this past weekend I pulled it off and tore down and sent pics to Cliff , who said he definitely did NOT build that carb. Anyway, not trusting anything the seller told me now, I wanted to verify WHAT engine is in the LeMans to buy the correct parts from Cliff.
I was told the engine was a 73 400. I think its a69 400 with 46 heads based on what I see. Can any of you numbers gurus confirm this?
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. 63 LeMans- 69 400 w/ original transaxle. 2.69 gears. |
#2
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A few more
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. 63 LeMans- 69 400 w/ original transaxle. 2.69 gears. |
#3
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I’m seeing a YD stamp and 9790011 casting
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. 63 LeMans- 69 400 w/ original transaxle. 2.69 gears. |
#4
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Pretty sure that’s a one year last two are 71 casting 1969 block it’s def not a 73
Yd is a 2 bl Catalina or Bonne or some Big car if I recall
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
#5
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This is per Wallace Racing's database.
1969 400 290 HP YD A 10.5 254 46 1-2 7029060/70 45 degree intake Block Casting # 9790071 Per the same database, the YD code in 73 is a 455. I would say you're correct that you have a 69 400 that appears to at least have the heads it was born with, or at least had the possibility of being born with.
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-Jason 1969 Pontiac Firebird |
#6
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What’s the two digit year date cast into the flat area under the dizzy on the drivers side?
Also a 73 block would have 5 motor mount pads on each side, which is not the case for a 69 block. The 979 start to the part numbers where only use from 68 thru 1970.
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I do stuff for reasons. Last edited by 25stevem; 03-31-2023 at 06:42 PM. |
The Following User Says Thank You to 25stevem For This Useful Post: | ||
#7
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The block code is 9790071 which is a 1969 400 YD engine. (with 46 heads)
I'd like the date code from the rear by the distributor and the numbers above the YD .
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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 |
#8
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The displacement will probably be cast large, right under the driver side head near the front. it will probably say "350" "400" or "455". You'll have to climb under the driver side.
Block date will be large, near the distributer hole. Head codes are large, cast on the center exhaust ports. Head date is right near the valve cover lip. |
#9
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Quote:
I THINK the date cast is “168” ? The ones on the back of the block are a beast to get. I can’t see them. I just stick my phone in there and shine my flashlight till I get something readable.
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. 63 LeMans- 69 400 w/ original transaxle. 2.69 gears. |
#10
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Quote:
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. 63 LeMans- 69 400 w/ original transaxle. 2.69 gears. |
#11
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Thanks.
Should be 7 digits. Probably 1st is a zero, so 0?18805. The date code is probably an 'I' 68 - I68 = Sep 6 1968 That's an early date for 1969 model year. So 7 digit # is possibly 0018805. (have to check my database though)
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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 |
#12
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This should have a partial VIN on the block, down by where the radiator hose outlet on timing cover is on passenger side of block. Mostly vertical, hard to read with any crud there.
Look something like 29P1xxxxx with the x's being digits, the P could be some other letter.
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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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