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Old 03-22-2008, 12:40 PM
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Engine ID?

I just bought a 1966 Pontiac LeMans, 2dr htp. It's been sitting in a field since 1976. I've been trying to buy it for two years and finally brought it home yesterday, on a flat bed, of course. It's pretty much all there, but after sitting in the dessert sun for all those years you can imagine that it will be a long project to restore. Anyway....the price was right....and it's mine....all mine!!! My better(?) half is all pi**sed off about it , but that's not my problem.

The problem right now is the identifying the engine. It has the 326 emblems on the side, but it has a big block under the hood w/4barrel. From everything I can find out it's either a 389 or 400. I just cant seem to find a match on the net. The engine ID number is 156298 with YS below it. I can match the YS to three or four possibilities, but I'm not getting anywhere with 156298.

As usual, any help would be greatly appreciated.

Thanks,

Chris

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Old 03-22-2008, 01:18 PM
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"but it has a big block under the hood w/4barrel. From everything I can find out it's either a 389 or 400. I just cant seem to find a match on the net. The engine ID number is 156298 with YS below it. I can match the YS to three or four possibilities, but I'm not getting anywhere with 156298."

First off, there is no big block/small block Pontiac. The blocks are all the same size externally. The number that you thought was an ID number is just a sequential number, but the YS, with the casting date, will tell exactly what engine that it was/is. The casting dat can be found at the rear of the distributor mounting pad. it will be a cast in code beginning wit a letter, followed by either two or three numbers. If that is a '66 model year YS block, it was a 335 hp 389 used with an automatic transmission.
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Old 03-22-2008, 01:35 PM
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Also, there should be some numbers cast over the two center exhaust ports. If they are origional to the block and are 093s, they would be for a '66. A '67 YS 400 would have had 670s. A '68 would have been 16s etc.
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Old 03-22-2008, 09:31 PM
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Trucknut, did you find any of the codes that I mentioned?
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Old 03-23-2008, 06:55 AM
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Thanks for the info . I didn't have time to get back to it yesterday. I'll check it out later this morning after the sun is up. I'll be sure to get back with you.

By the way, this engine has the old style mechanical distributor and a Quadrajet.

Thanks again....I'll be back.
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Old 03-23-2008, 11:38 AM
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So far, all I can find on the block, where the distributor goes in, are the following numbers. It looks like 6138 with no letter prefix and below it in smaller numbers is 248
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Old 03-23-2008, 11:54 AM
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OK........I found the number in the block by the distributor to be 'K246'. Had to do more cleaning and get some better light. I can't find the number on the side of the block, but the heds are casted with the number '670'.

Thanks for your help.
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Old 03-23-2008, 12:46 PM
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That block was cast in either October or November '66 (at least one plant didn't use an "I") for the '67 model year. The heads are probably original to the block, and the 670s used to be the most sought after Pontiac D port head. Good find!

Bill
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