I'm new to this so please excuse my f ups!  I just had my 429 CJ rebuilt from the ground up, I broke the crank last august, new pistons, rods, crank, (forged this time) bored etc.. Full roller motor, the guy said to break it in drive it, I said ok. Here are my issues 1st time I go out the starter fried, went and got one from the auto store put it on cranked the motor in reverse. Blew some flame out my carb. Pulled the carb checked the power valves etc everything was good or so I thought.. I go out again, it's sputtering.. I change the plugs change the oil runs perfect..5600 rpms, 84 gps, love it. I park it.2 days later I head to lake Oroville for fourth of July put my boat in the water, warm it can't get more than 5300-5400 rpms out of it.. I figure conditions elevation or whatever.. Then I'm haulin ass back in to camp about 5300  let off the gas it and all of a sudden it's running radical missing and blowing some black smoke shut it down and 2 foot flames come out of my basset headers for about 15 sec.. I get towed in tried starting it and I had to have my foot in it to keep it running still the same feeling like it's flooded to shit.. Next morning.. I start it. Runs like nothing ever happened. Still at 5300-5400. Now I've talked to a guy he seems to think I may have cracked a piston?? Oh and in the mean time my headers cracked on the number one cylinder, anybody with any similar stories or some input would be great! I have a built berkley with a bronze impeller I believe it's an A. My hull is a 79 sleek craft tunnel sst. Any help or input would be awesome!

Pull the valve covers and look for bent pushrods/broken rockers. Compression and leakdown test would certainly be in order before you run it again. Should give you a better idea about what happened and whats going on in there.

Black smoke......flame out the exhaust....cracked header.......bent exhaust valves possibly?

If all that checks out, I'd be thinking ignition timing/Dizzy problems.

Ray

5800 RPMs on a bronze A?       

I'll get back to that later......

I am immediately thinking two things. With three carbon laden plugs, carburetor issues surely could be the cause. I am also thinking that you have some bad ignition wires, you mention three fouled plugs and "a few" plug wires fitting loosely, any chance the loose terminals were on the fouled plugs?

The next thing I am thinking, do you have a rev limiter? You may look into that, seen those do some Twilight Zone type things before. They really hate moisture from my experience.

I would also have the tach checked out, along with the wiring harness for possible issues.

It could be valve related for sure, but a compression test and a vacuum test would find that pretty quickly and should be easy to rule out..

Sounds like a bad ass boat and looking forward to the pictures..

Welcome aboard and good luck.

GT

I've got the whole msd 6al box, coil, Distributer, wires, it's got the round dials to adjust the  1st step rev limiter, and second step 1* advance and retard, One more thing.. Do they make a pressure sensitive valve for the water injected headers? I'm sick of reaching back and opening it up and closing it, I've gotten water in my oil from leaving it open at idle I guess??

The bomb diggity for waterr control of injected headers is a Banderlog http://www.banderlog.com/products/waterInjectionValve/waterInjection.html system...., bad ass but pricey....

You could also get just a standard Bassett water control valve...People here probably have what you need used for a reasonable price.

GT

Let me know if you can see this album!


http://www.facebook.com/media/set/?set=a.1499465404026.2070436.1155881721&l=94a63d632c

That boat is sweet. How fast were you guys going in the video?