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Old 03-08-2010, 10:53 PM   #1
dyno
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Join Date: Sep 2008
Location: Middleton, Idaho
Posts: 352
427 or 454: how can you spot the difference?

Hi,

I just bought a 1973 K20 4x4 flatbed with a big block. The guy says it's a 427 but not 100% sure. Could be a 454. How can you tell the difference? I can't see the block casting number. It's too close to the firewall.

Thanks,

dyno
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1958 GMC 150 4x4 in progress
1980 K20- Restored
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58 GMC 4x4 build thread:
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