4.0 vs 4.3
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id say they are very close. the SOHC 4.0 has more horses but the 4.3 power comes in sooner. the 4.3 is a great motor too and responds well to mods. but i do know that my ranger with the SOHC 4.0 will walk all over my wifes blazer with the 4.3 vortec. i put my truck up against my buddys 2002 4.3 sonoma at the dirt drags a few years back and i beat him by a truck length but his was faster out of the hole.