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Old 09-10-2011, 03:37 PM
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inline 6 gmc block casting location???

GMC INLINERS

Where do I look on a 1952-54 inline 6 G.M.C. block for the casting numbers? I have this number by the distributor F12110BF ??????????? not listed on any info I have???? Help!!!

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Old 09-11-2011, 12:16 PM
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Should ber a casting number on the right side near the distibutor along with a number cast in of your engine size (GMC only). Here are some more casting numbers that may help you. , http://clubs.hemmings.com/clubsites/...indercast.html ,
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Old 09-11-2011, 01:32 PM
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I have a 55 and the number is stamped showing that it's a 248. Maybe you have something like a service or replacement block. I think the 248 and 270 shared the same bore so a service block would likely not have been stamped.
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Old 09-11-2011, 02:54 PM
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Thanks.....for the help ....I have looked at all the supplied numbers for engines sizes....not seen anything like that stamped on the pad next to the distributor...I thought there might be a number cast on the block somewhere else>>>Thanks for your help G.T.
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Old 09-11-2011, 04:27 PM
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Gmc

What is the bore and stroke?

Ron
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Old 09-11-2011, 06:39 PM
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The engine is in a truck I am considering on buying so....I don't know bore or stroke???..nor does the owner. I need a 302 engine which has a 4inch bore x 4 inch stroke....that is why I am trying to locate block numbers to make sure it is a 302 before I buy it. Casting number 2193980 should be for a 302 for 1952-54. But I can't locate this number by distributor...I thought it might be somewhere else on block??? Most cubic inch numbers are located on pad by distributor.....this isn't the case on this motor.
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Old 09-11-2011, 09:08 PM
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Gmc

Measure from the pan rail to the deck. The 270 & 302 engines should measure 11 3/16" if I remember correctly. Smaller engines have a shorter deck height since they have a shorter stroke. By the way what kind of truck is this? Pickups didn't have 302's but not sure on the 270. I think the biggest engine in the later year PU's was the 228 cid.

I'll do some more looking to see what I can find.

Ron
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Old 09-11-2011, 09:16 PM
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GMC casting numbers

Can you pull the valve cover and get the casting number off the head? Then I can tell you what engine it is.

By the way I built a 321 cid Jimmy for a HAMB dragster and dynoed it at 347 HP @ 5600.

Ron
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