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Nathan,
Im sorry but I dont no of anyone running the Jacobs ignition with a 460. I have one installed in my Jeep and it seems to work very well. My Jeep is so underpowered, but low geared that I didnt notice any big HP increase, but I did notice very good performance improvements,such as steadier idle, smoother acceleration, and better fuel economy. However it was installed at the time as a K&N filter, Bosch Platinum spark plugs, a High Flow Catalytic Converter and a Pro Flow Muffler. I run an MSD ignition in my 91 F250 460, it works extremely well providing the spark, for all of the other mods. Later,
Jeff
I installed a jacobs ignition on a 83 Bronco with a 460 motor about 6 or 7 years ago. I was immediatly impressed with the performance increase and smoother running. At one time I buried the truck in a swamp, water 1" from the top of the valve covers. Every time I hit the gas to go forward or backwards water would gush out of hood, fender, cowl openings and it still ran on all 8 cylinders! (had to get pulled out with a tractor) About 4 years ago I added a Mallory Unilite distributor to fine tune and limit the advance. This truck still runs excellent today! Words can not express how pleased I am with Jacobs! I highly recommend them! Good Luck! P.S. I have other vehicles with Mallory, Accel, and MSD ignitions. They also work excellent!
I have had a Jacobs on an 85 351w and an MSD on an 84 351w and have noticed no difference on either of these. I am sure they make small differences but unless you were doing huge highway driving I doubt you would notice.
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