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Username Post: Big block gmc
gfm64
Contributor
Posts 105
12-29-20 11:49 AM - Post#2810961    

My grand son has a 72 GMC 1 ton dually. Some one some where dropped a big block of unknown size in it. Now he wants me to find out what it is. I'm guessing a 402 but I'm no expert. The number on the block above the water pump is cast in. number is 557752 3B any one know what that is?

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