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Old 05-18-2008, 05:52 PM
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GMC Inline 6 cylinder

Can someone help me. I have a 1983 GMC serria with 31000 miles on it. I'm trying to find the casting numbers on the inline 6. I found these numbers on the side #473483 and these behind the distributor 5499 E-5 on the inline 6. But can't finded these number on any website. I was going to put a 1972 chevy small block 400 in it but changed my mind and going to sell it..

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Old 05-18-2008, 06:16 PM
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I'm confused. Are you selling the truck or the 400 or the I-6? What are you keeping and what are your plans for it?
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Old 05-18-2008, 06:46 PM
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The truck came with the inline 6, sorry about that. That is what I'm trying to find out the location of the casting numbers.. The 400 enigne was what I was going to put in it but change my mind,
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Old 05-19-2008, 12:31 AM
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Are you sure those are the correct #s? I couldn't find anything either. Look on both sides of the block. Someone told me there on the passenger side but I don't know much about the Sixes.
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Old 05-19-2008, 10:21 AM
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Just a question, if you are selling the truck, what is the urgency of finding the 6-cyl casting numbers?

thnx, jack vines
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Old 05-19-2008, 01:11 PM
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I wasn't going to sell the truck.. Just the small block 400. I'm trying to find the casting numbers on the inline 6 that in my truck now.
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Old 05-19-2008, 06:00 PM
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try down by the fuel pump, numbers are normallty there. it's a 250 or a 292, but both having the integral intake head, your engine, whichever it is will really benefit from a swap to a non integral intake head
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Old 05-20-2008, 12:31 PM
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Ok, thanks.. I will look.
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Old 05-20-2008, 03:16 PM
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Thanks alot. You are right it is a integral head. Its going to be cheap to finish my small block 400..
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