Nosfool

It is an aluminum headed 383 with fast xfi sportsman fuel injection and procharger. I did a bravo swap 1.5 ratio with labbed 26 pitch 4 blade prop. Only turning it around 5100. It has more in it but the chine walk gets bad. Also added a Mayfair single ram add on hydraulic steering.

201liberator

That sounds very interesting. How does it get on plane with that setup? Is it a P1SC head unit? Prochargers don’t build much boost below 3,000 rpm.

4 blade props didn’t work for me. They gave me too much stern lift and they made the boat unstable. I use a 23” Mirage Plus 3 blade which gives more bow lift. Chine walking only becomes an issue with too much trim. That happens when trying to get the last 1-2 mph of top speed.

Nosfool

I tried 25 pitch 3 blade and the 26 4 blade it was about the same with the chine walk. It planes great no issues there. It is p1sc head unit with very large air to water intercooler with the race procharger blow off valve. I run edelbrock mpi intake with sheet metal elbow and Wilson 105mm throttle body. Only running 5psi of boost.

Nosfool

Sorry for all the tools and extra stuff in the pictures that’s during assembly. It gets old crawling in and out of the boat to get something when working by yourself.

201liberator

Very nice. Did the single ram hydraulic steering change the way the boat handled?

I have a Mustang Cobra with a D1X A2A setup with that same bypass valve. It has 19# max boost right now.

201liberator

Nosfool did you dyno your engine before installing it?

Nosfool

I did the steering for a safety feature was warned about steering cable breaking at speeds over 70mph. I did not dyno the engine just installed and tuned it on the water.

201liberator

My exhaust exits through the stock exhaust ports while I see you installed new exhaust ports in the transom.

What cam are you using in that 383? Is it a hydraulic roller? Do you have forged crank, pistons and rods?

What compression ratio? What fuel do you use as far octane?

201liberator

Another question for you Nosfool. Is your Mayfair steering an add on single ram kit or a full hydraulic single ram kit?

Nosfool

The exhaust was set up with through hull when I purchased the boat. The owner said it only had the exhaust through the foot until he added thru hull. I did change put bigger tips and lightning headers on the motor when I installed it. The motor has a scat nodular crankshaft 4340 I beam rods and wiseco dished forged pistons. Makes around 9 to 1 compression. It is hydraulic roller camshaft and it is a 1 piece rear main seal block. The Mayfair is an add on kit not full hydraulic. It works really well. I had comp cams do me a custom ground cam for the set up.