I have a stock carbureted 7.4 merc. And wanted to beef it up a little by doing some Heads,Cam,intake, and headers or should i just save my money and upgrade to a 502mag.? I would like to be around 500hp. So if you guys could share your opinions I would appreciate Thanks!

330 or mag? Mag,,,not that difficult.. 330you will be doinng the crank and rods too

Yeah its just the 330. So you think i would be better off just upgrading to a 502mag

yes

Ok! Do you know if the magnum motors have the rectangle or square port heads or are they still the small oval shape like i have now?

Pay close attention there are peanut's and oval's, Dont be to dismissive if you have oval's a lot can be done with them.

mags are rectangles.

Thanks for the info! I appreciate it

502.

Watch out for those 'slick' peanut butter port heads.