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Although I have heard a stock 360 magnum with a carb can make more power than a completely stock magnum 360 with the barrel intake and FI.



this is true. in stock form, the EFI 5.9 was rated at 345 tq and 250hp. the stock manifold is a TRUCK manifold, meant for low RPM torque/towing.

the 300hp crate engines were just a bone stock 5.9 with a carb and dual plane intake. the biggest gain is from the intake, which allows the motor to breathe up to 5-6k rpm, which is where the higher Hp comes from. carry 345 ft lbs higher into the RPM range, and you make more Hp.

the 380hp crate engine was the same bone stock 5.9 with a cam, intake and carb. My truck is a near copy of that motor, I'm running a hughes whiplash cam 222/228 @ .050, .544 lift and 106LSA (with their 1110 springs, retainers, etc), plus a stock TB ported to 50mm (stock has 50mm plates, but necks down to 47mm just above the plates), and the single plane, MPFI M1 intake; I made 281-285 rwhp, which puts me right up at that 360-380 crank hp mark.

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