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post #1 of (permalink) Old 07-02-2001, 11:06 PM Thread Starter
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4.0L head bolts

Can anyone tell me how long the 4.0L head bolts are and what torque they are to be tightened to? I'm lookng for some 1/2" course thread head bolts that are 3 3/4 long on the spark plug side and 4 1/4 on the intake/exhaust side to fit an 84 4.2 head onto an 80 block (which has 1/2" head bolts). Can't use either's original bolts as they are either the wrong length (the 80 uses 1/2" but all are 4 1/4 and the 84 uses 7/16" but some are short (spark plug side)).

Does the 4.0L use short bolts on the spark plug side?

Closest match I can find are small block chrysler head bolts, some of which are 3 1/2 long.



84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster
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