MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone.
You are invited to join our public Boat Repair Forum to seek assistance from other members.
You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
+ 1 !lack of credit card is the only one i can think of...just be selective in what you order. Getting the 'racing stuff' is usually throwing money away when it comes to boats. You need to get heads with the proper chamber size and you want the smaller intake runner size to keep the torque peak in the lower rpm range (a balanced system working with the camshaft's profile).