4.0 questions
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4.0 questions



I have my 4.0 Jep engine tore down, ready to be
checked out. I have some questions maybe someone can
answer as I have never messed with these engines
before. I have a lot of 232/258 time behind me,
though.
First, the soft plugs seem to be 50 MM in size, is
this correct? I assumed they would be standard sizes,
but in comparing them I came up with 50MM.
This engine came out of a Jeep that must have been
rode hard and put away wet as every oil galley hole
was plugged with dirt. Maybe a mudder?? The crank was
in good shape and the engine still ran. What should I
look for. I have it stripped bare and will hot tank it
and measure the taper, bore, crank align, etc.
I plan to put a 258 bottom into it, any year
suggestions. The 4.0 is an '87. What should I do to
the bottom end? 
Thanks all......Russ


		
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