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Old 06-02-2002, 10:47 PM
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Post engine numbers ?

I have a Jag XJS with a 350 chevy conversion that has been somewhat bodged! (english expression for screwed up) In order to meet smog requirements I must add smog equipment etc and need to know the model of car the engine (a remanufactured) that it came from....engine block numbers say GM Mexico 3970010... anyone know how to figure this one out?

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Old 06-03-2002, 03:55 AM
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thats the block casting number,it means 4inch bore,made in mexico, hi nickel alloy.might not be a 350 but probably is,but doesn't tell anything about the engine.If I had to guess I'd say it was a chevy target motor made before 1978,9.0 cr 4 bolt mains,cast pistons,but thats just a guess.If I want it to pass emmissions test I would get an 85/6 tune port unit 2 cats and an AIR pump,once the test is done you could remove the cats and take the belt off the pump for better performance
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Old 06-03-2002, 05:28 PM
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That casting number was used for 1969 302's, 69 327's and 69-80 350's. Since your car has a 350 conversion I would guess its a 350 if you had it done somewhere. The casting number does not determine if its a high nickel block though....that info is found under the timing chain cover, 020 means 20% nickel. I think I would check out the emissions setup on some 1980's trucks, since they're more likely to have a 350, and go from there. I have an 86 silverado and I think all it had were cats and a smog pump. Good luck, HRS10
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Old 06-03-2002, 09:36 PM
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One way to approximate the year is to see what side the dip stick is on. 1979 and back had it on the driverside wile 80-86 had it on the pass. side. 79 and back only had cats,egr,vapor can,thermo aircleaner(well at least on my 78 anyway). Also check on the block tab in back of the water pump under the altenator for a three letter code (example CMJ) look it up in a MOTOR'S manual it should tell you what year and models it was out of. Good Luck
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