Originally Posted by fkboatman

that really sucks, another big block that had the cam for dinner. does anyone know how they where broke in. did they use joe gibbs or other brand to break them in? remember break in break in is very important.

Originally Posted by rob vanharten

Thanks for the advice guys. At this point if the bottom end is good and I can drop $1500.00 on each motor with new cams lifters push rods and a oil change or two I would be happy. Just trying to put a game plan together at this point. I know both motors are coming out before the boat goes to sleep for the winter, so i can have new parts installed in both and be ready for spring. I would be really pissed if this was june. As far as the cams, I do not need them to sit there and almost die at an idle, but when I pull into a channel at idle I want to turn heads cause they sound mean. The 731's in my opinion sounded to close to stock, if not stock. Just looking for something that sets me apart from the croud. With a little attitude

Originally Posted by mrfixxall

you say the engines only have 5 hr's on them? talk to the builder and see if theirs any warranty!! also cut open the oil filter on the other motor and compare the metal particles,could be from brake in..if the cam is going south it usually starts at the top of the lobe and not the side..

as for your next cam talk to bob madara @ marine kinetics,he is to cam god on here..

Originally Posted by MILD THUNDER

I would go with the crane 168741 cam. Its a bit more aggressive than the ones you have now, and work very well with blowers. I would skip the prochargers, and stick with a roots style blower. I know too many guys with prochargers and spend lots of hours trying to get them to work properly. Once setup they make lots of power, but theres a reason all the big builders are still using roots blowers even on 1000+hp marine motors.

Introduce yourself to jimv. he is close to you. Let him help you get your motors straightened out. i agree you should switch to hydraulic roller lifters.

For all you know, you could have valve springs binding, too stiff of valve springs, etc. JimV will be able to get you going in the right direction.

Sucks, but at least you have all winter to go thru them, and come spring, you will have some bad a$$ motors. Hopefully you maybe just need fresh bearings in the bottom end. The cam material will get in them. Hopefully you cought it fast enough where the crank/rods didnt get hurt. It sounds like you'll be ok.

Originally Posted by rob vanharten

Just got of the phone with Jim. What a great guy, explained everything to me in detail, and helped me understand what was probably going on with this engine. Looks like both motors are getting pulled and dropped off at Jim's for a little upgrade After talking wiith Jim I feel very confident that we will have these motors figured out and rocking, not to mention not having to cross my fingers everytime I turn the key. Thanks Jim!!!