Are you WOT at 5000 rpm? If so you're engines may need to turn more rpm to get the hp out of them. Have you tried a lower pitch prop?

looking for some info in 84 chris cat
 

i am thinking on a 84 cat with twins 500/ the guy told me is a 80 mph boat, i might work a trade with my stinger plus some cash.
any suggestions?
the cat needs cosmetic work but it runs good according to the seller.
the boat is in the classifieds ad under chris craft.
i want to go a little bit faster and i love my stinger but iam top out with speed, i hate to let it go but i might have to,
if anyone here wants to work something out trade up or down with cash let me know.
if the deal is intersting i am ready to do it.
i have all the pictures of my stinger restoration
i am looking for something bigger that 25 ft that i can go out and go in the mid 60s mph i will be happy for now,

did you check for insurance on this cat before doing the move? I would check! and by the way, I went up from 2 x 275 HP to 2 x 485 hp... and it does cost the double (almost) in gas. I hope you knew that! I contacted this guy also for the cat and he claims 90 mph... should be enough since you are looking for mid 60' !:D

The x dimension is the starting point on all these boats. 17 in diameter wheels need to be ABOVE the bottom of the boat and small bravo 15 inch props seem to be good even for starting points. On my 85 Chris and friends 84 Shadow,95 Awesome and 96 AO all are quicker and handle better turning props IN. These boats have a narrow tunnel and not as much air to lift the nose resulting in a hop. Forward weight or extra cargo seems to change mine, although in rough water or chop, porpoise is much less noticeable or gone. These boats are true tunnels and as most have quirks. They do not act as pleasant as modified designs with center pods but are superior in rough water ride and handling. You can not have it all:D....unless you step into a Skater,MTI,etc. which in my opinion is another league. Good Luck

Eddito,

My 85 Chris Cat runs 90-95 with a pair of 565hp blower motors. I rode in it once at 90mph when i bought it and have not taken it out since i purchased it in October. It's up for sale for $36,500 at the moment. It looks to be in much better shape than the one your are currently looking at. The only reason it's up for sale is i am trying to build a house. The port motor is currently in the machine shop getting reworked. I'm swapping the HiPo Chevy heads for a pair of mild ported Merlins, the Supercharger is currently at The Blower Shop getting tightened up. My plan was to get both motors worked this winter, crank up the boost a bit and try to get up to 100mph.

Let's see some pics....

Just seen them on another thread............Thanks.

My 84 CCAT has twin 400 HPs amd SSMII. max speed in high70's. I have one engine not turning as many rpm's as the other at WOT (-500 rpms). My X looks to be about even with the bottom and I know mine is factory original. I have 3 blade cleavers labbed- don't know the size. I do not have any hop.

Wannabe

Nice looking Chris Cat..... Lets see some pics.....