Thread: old skool 454 vs 7.4 vortec for torque?

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With 44" tires, you'll need rear gears into the 5's and a transfer case into the 9's or 10's to make a final drive of ~40:1 to 50:1 to have any tractability at low speeds and do rock crawling. I just went over this with another rodder. $2K won't even make a good down payment by the time you purchase EFI and an aftermarket transfer case. You'll generally need at least $1000 worth of machine work on the block and heads to make everything right and build a good foundation for power. I would probably begin with a Mark IV block and use peanut port heads.
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