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Re: 427 or 454: how can you spot the difference?
Quote:
Originally Posted by dyno
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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Look at the boss just in front of the right head. Provided the block has never been decked and that number ground off your should see a number that starts with two letters followed by three number followed by two letters. That you can look up and it will tell you the year, size and in some cases the type of car it came out of.
Hope that helps.
__________________
07 Chev 2500HD Classic
Project Ranch Hand, Hauling A$$ since 1973
I was told this Project had a L-72 427 425HP, It did not.
It does have a 427 block and parts from various 427 motors. It will end up with a nice strong 454 in the end.
It has not been run for 20+ years
Frame up restoration started2/15/2010
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