The 54 and 55 1st are a thicker casting in the cylinder walls which
allow for a larger overbore. It is also said by some that these used a
superior high nickel alloy than the later engines, though there seems
to be some
room for debate here, and no documentation that this is the case. For
guys that want these for a AD
the 54 and 55 1st are preferred for the right water pump placement, both
height and length.
Grant,
50 Chevy 3100
52 GMC 150
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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