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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#19187 03/19/2002 5:37 PM | Joined: Jan 2002 Posts: 17 Apprentice | | Apprentice Joined: Jan 2002 Posts: 17 | I have an old 56 GMC M-220 Military 6X6 with a 302 inline 6 as a power plant. It is currently partially running (Missing on a few cylinders). I am going to take a compression check to see if I have valve problems. The guy I got it from ran it with the miss for quite a while so I'm afraid that if it has valves out the head may also be damaged. There is a guy at work that has an old GMC pickup that they someone let the block freeze an break but the head seems to be ok. I don't know what size that engine is for sure but I was wondering if the head on that early 50"s PU would fit on the 302 or not. I have worked on Chevy's since since I was little (since my hands would fit in places that Dad's wouldn't) but I haven't had much experience with GMC's. Any help would be apreciated.
Kenneth L. Hollingsworth
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#19188 03/19/2002 6:39 PM | Joined: Oct 2001 Posts: 194 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2001 Posts: 194 | Ken: I think the 302 head has bigger valves in it than say the 228 or 248. I am not sure how much difference there would be between the 270 and 302 head. I have a friend here who just built a 302 and the valves were much bigger than those in my 228. | | |
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