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Originally Posted by Malykaii
While one article mentions that it should increase mpg simply by cutting .4 L off the motor, it also mentions that I'd need a different cam shaft and roller rockers to match. So sounds like $1,000 in parts to save $300 in gas. Plus if I understand correctly, your saying that I'd have to rev the engine higher to compensate for lost torque, making me use more fuel and ultimately defeating the purpose.
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Depending on the cam profile and the intake and exhaust manifolds, it might decrease the engine's tendency for going rev-happy and improve low-end torque. Otherwise, yes, you'd have to over-rev it and resort to a lower diff ratio in order to get a similar overall performance.
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The 4.2 v6 sounds like a rad idea! Looks like it shares the same bell housing bolt pattern as a 302, so it would almost bolt right up! Also, wouldnt a t5 out of a mustang be a better geared trans for that or do you think the f150 truck trans would be better suited.
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Since trucks usually have a wider gear spread, it might not compromise too much the take-off when you resort to a higher rear-end ratio.