I used SCAT cranks also

Good call on this, I disassembled the heads last night and found a lot of unevenness between cylinders on how clean the intake runners are, and how heavy the deposits were on valves. Who does this?

Also, someone mentioned stainless and inconel valves. Since these motors have been apart before how could I identify what kind of valves are in there now? I ask because I noticed a magnet does not stick to the bottom (valve) half of the exhaust valves, it will stick to the stem, and all over the intake.

Member ArticFriends, in Michigan, is close to you. He can do your injectors. He's quite intimate with the 502MPI system. LOl.

http://www.offshoreonly.com/forums/g...injectors.html

that's an understatement......................probably done more work on them than Mercury

Also, someone mentioned stainless and inconel valves. Since these motors have been apart before how could I identify what kind of valves are in there now? I ask because I noticed a magnet does not stick to the bottom (valve) half of the exhaust valves, it will stick to the stem, and all over the intake.[/QUOTE]

That can be a hard thing to determine. Manley put a code on the stem, usually a letter and number. I have not seen a code chart to figure it out, but you can call maley to find out. That is if they are manley valves. I personally feel better changing valves if I am not sure of what they are. Nothing worse than dropping a head of a valve on a nice engine. Good insurance.

http://i176.photobucket.com/albums/w...psbbijdmhe.jpg

Its not supposed to look like this? LOL, that is not from a boat, A customers car at work a few years ago. (I'm a tech at a GM dealership)