Originally Posted by offshorexcursion

Unleashed is running great and we are enjoying the new engines! The fresh Supercat engines that came in the boat spun a rod bearing the first time out destroying the starboard engine. We are pretty confident that the oil system was never cleaned out properly before the engines were installed. The tanks, lines, and coolers were full of metal shavings on BOTH sides, and the port engine still looked good internally. So we parted them out and started fresh ordering new parts in November. The plan was to build a pair of 557cu/in 1100hp Whipple 4.5L intercooled Port Injection Engines. Plans changed in March after finding out my Headers were too restrictive. Instead of spending all that coin and risking disappointment running current headers, or delaying the build further ordering new headers and spending another 20k, we decided to listen to my friend’s original advice (engine builder friend Scott & mentor Joe “Mild Thunder”) and build Carb’d N/A Engines. Super Happy with the decision! Plus you can’t beat the sound of some naturally aspirated tractor pipes! Here is a rundown on how the build turned out.

753hp @6000rpm & 731ft/lb @4600rpm 93 pump fuel on a DEPAC Dyno with my 1 7/8th Headers and flame arrestors. Made 800 with Dyno Headers.

572 cu/in
9.95:1 Compression
Dart Big M Blocks
Callies Magnum Cranks Dual Keyed
Carillo Rods with Carr bolts
JE Pistons
Morel Hi Rpm .903 Lifters
55MM Hyd Roller Cams
7/16th Pushrods
AFR 335 CNC heads (Precisely tuned by sizing guides for my application, valve job touched up, clearance pushrods, spring pressures, etc.)
T&D Steel Shaft Rockers (Precisely setup)
Spring Oilers
Piston Oilers
4 Stage Dry Sump Oil System
Oil thermostats
Oberg return line oil filters
Jessel belt drive
Victor JR. intake Ported
Prosystems 1200 Dominator Carbs
Daytona Sensors Ignition

They start and idle in gear at 700rpm with the crash boxes. Acceleration is impressive and they can be run hard until you get tired of holding the throttle forward! Plus they are pretty efficient; we cruised at 4500-5000+rpms for over 220miles straight and only burned 181gallons total, 1.21mpg. No speed numbers yet just running some borrowed skater cat 1200HP Thick 37” Pitch 15deg rake 5 Blade 16.5” Diameter Mercury Racing Offshore Cleavers but she’s pretty fast:-) Best part is the boat is rock solid, handles so good she’s almost boring.

Overall we are happy that we found some great guys to help with the build, guys with more than just theoretical engine ideas. Guys that have engine building, rigging and setup knowledge plus actual hands on experience! It paid off after running over 100 miles on the maiden voyage with no major problems! Easily broke 100mph and have been running fast and hard ever since! Kristy and I are impressed to say the least. Especially after hearing and watching horror story after horror story of catastrophic failures, rigging issues, and even setup nightmares. Pretty refreshing to finally have a good outcome to this adventure!

Here is a teaser clip with more to come throughout the off season!

Hold on tight and crank up the volume while you watch this in 1080HD

https://www.youtube.com/watch?v=tIx6ID45gFY

https://www.youtube.com/watch?v=tIx6ID45gFY