502 rebuild and upgrades

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10-01-2024 | 10:48 PM

#11

smokediver

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Joined: Sep 2009

Posts: 299

Likes: 83

From: Naples , Fl

Quote:

Originally Posted by Zach5187

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

I had the same engine and was a little north of 1000 hours when I decided to rebuild and upgrade. I went the carbed 540 route. Dart 335 heads , re-used my closed cooling. Stainless Gen 3 exhaust with 4 1/2 pipes , Daytona ignition box. Couldn’t be happier. I’ve got a lighter boat than you so a different cam may be better for your application. I have a B1x upper and a minus 2 imco lower. With this power curve I’m not putting a lot of stress on the drive at cruise speed and 3400 puts me at 52 mph.