502 rebuild and upgrades
#1
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Join Date: Jul 2022
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502 rebuild and upgrades
I am wanting to overhaul my engine its a 502 mag mpi. going to make a 509 go with promaxx 317 head not looking to get into a debate on this head or that head. My main question is what cam would be a good cam? really would like to get to mid 650hp. boat is 7200 lbs. I plan on upgrading the manifold to a holley and going with holley efi. Thanks in advance
#2
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Don't know what ECM you have but Eddie young programed my MEFI 3 to get 530hp
MEFI is easier to tune and I'm sure there are some here with the correct bin files. I have the one for mine
MEFI is easier to tune and I'm sure there are some here with the correct bin files. I have the one for mine
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I'd be more concerned at building torque then horsepower with a 7200lb boat. You'd have to spin it 6000+ and more compression than I'd be comfortable with. I'd try to keep it to 5600 and as much torque as possible. At least you're starting with good heads.
#7
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This is the cam I ran in a 548 with iron 088 heads I used to have. I also had a really heavy boat and the torque definitely was a plus. I am currently running the comp 525efi in my current motor and happy with that cam.
#8
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On promax web site they say .600 max lift for 317 head. Does that not apply if you use different springs?
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liberator221 (09-30-2024)
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