360 to 390
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360 to 390
I recently bought a 1971 Ford F-100 2wd pickup. The 360 in it right now needs new piston rings bad. I going to pull the motor soon but I need some help. I'm thinking of changing the 360 to a 390. What all do I need to do to do this? I think I only need to get a 390 crank and put it in my engine but I not for sure. Also about how much horsepower would this 390 make? Any info would be helpful.
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Joined: Oct 1999
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360 to 390
As far as I know the only differance is the crank. As far as hp I would say your going to notice more tork as opposed to hp. Thats what you want from a pickup anyway. It might be easyer and cheaper to find a complete 390 to bolt in. Just my .02 cents.
Craig
Craig
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360 to 390
The two engines share most everything with the exception of the crank, connecting rods and pistons. Both engines have 4.05" bore sizes. The 390 crank will give you a longer stroke (.28" longer), hence more ci's. The 360 rods are 6.54" and are known as "long" rods while the 390 uses 6.488" "short" rods. The pistons are also supposedly different as well. According to "How to Rebuild Big-Block Ford Engines" by Steve Christ, the 360 have full skirted pistons and the 390 has slipper skirted pistons to allow clearance from the crank at bdc. I have a factory 360 with slipper skirted pistons, so I don't know how relevant all his info is. I would go with the slipper skirt on a 390 though to address the clearance issue. I don't know all hp and torque figures, but I do know a factory 360 only has about 200 hp. It should have much more torque than horses.
Jim
Jim
