Can I swap a 258 crank into a 242 (4.0 liter) block?
To put a 258 crank in a 4.0 block you use the 258 crank and rods, 4.0 pistons. That’s it. All bolt right in with no mods. You do need a 71 or later 258 — the later the better. The computer needs no modification. Frank Swygert – DSRTFOX@delphi.com via the AMC-LIST Dan’s Note: With a 3.88 inch bore and a 3.895 inch stroke, You’ve got a 276 cubic inch (4.52 Liter) motor! Phil Campbell javlnman@lewiston.com provides the following link to putting a 4.0 liter head on a 4.2 liter block. http://home.att.net/~jweir/jeep/head/home.htm (note – link is dead…
