Includes GM Factory New Engine, PSRU with bell housing and coupling system, SDS Engine Management system, engine mounts, complete cooling system, all accessories and MooseMods proprietary upgrades.  Allow 60 days lead time.

Watch for more information soon at

NOTE:  Neither of the above packages include propeller, governor, spinner or backing plate.  We are happy to help you locate those of your choosing and coordinate the acquisition. Prices are subject to change due to vendor and supplier changes in pricing structure.  We do our best to continually negotiate the best pricing and pass savings along to you!

Options:  MooseMods custom 4 into 1 stainless headers:  $2,500.00 US.  Allow 30 days lead time.

                 Ready to paint and mount two part cowling: $4,500.00. We can provide the cowling

                 with builder installed components for less.  Let's talk about what would be best for


                 Allow 60 days lead time.

The Airframe

Engine Install Pictures

Airframe Upgrades

With the wide range of options an owner has to consider, let's talk about what will best serve your needs and we will be glad to put together some firm numbers.  For starters, we will provide either all of the components for an owner install,   assemble a ready to bolt on engine package, or do a complete install of the desired package with your airframe at our facility.

The desire to develop a new generation, strong performing and reliable power plant led to the decision to use the GM LS 3 series engine.  The design of the 480/495 HP version used here in the Bull Moose was such that it was built for continuous high rpm by the use of a special camshaft and valve train for that application and a very flat torque curve.  Those elements and the readily available power plant made it an obvious choice.  It has proven to be a light, compact and high power to weight ratio engine which is demonstrating it's reliability in many applications.   The use of the Firewall Forward CAM 500 PSRU with the 2:1 reduction ratio, is proving to be an excellent package and one in which we are very comfortable in supplying to our customers.

Advantages of SDS vs. Conventional Aircraft Engine Systems

Virtually zero maintenance, lower fuel flows due to better mixture distribution, automatic mixture control, no carb heat, smoother running, no mag checks, no live mag issues, longer engine life due to proper mixture control and less bore washing are some of the major benefits of EFI.

LS3 480 hp Component Only Package:  $39,950.00 US


Moose Mods

Firewall Forward CAM 500  PSRU provides a well proven system to accommodate the LS3 Engine.  Designed to be used for engines up to 500hp, this unit is also capable of using two PTO adapters to drive both hydraulic prop governor and vacuum pump or other accessory.  This is a very robust and well produced unit with a great track record, hence the choice to use it in the Bull Moose

​​The airframe of the Murphy Moose and Super Rebel aircraft have a well deserved reputation of having a robust structure.  After extensive field operations it has been demonstrated that some structural enhancements would add to that utilitarian design, so we have taken the thoughts and ideas many have contributed and put them into production and are making them available to builders and owners of operating aircraft.  Most of these are such that they can be retrofitted to existing aircraft.  Of course it is much easier to incorporate those into the original build process, so we encourage that and are glad to support builders in the integration of these elements which do not compromise the original design, but rather enhance the strength and utility of the airframe.

​​The Heart of the "Backcountry Bull Moose"*

The ​BACKCOUNTRY SUPER MOOSE package includes the 380 horsepower version of the same LS3 engine used in the BULL MOOSE.  All of the same proven components are used in this package.  The 380 hp version is an excellent choice for an owner wanting greatly improved performance and operational economy beyond the currently available standard aircraft engines for either the standard SR 2500 or SR 3500 airframes.  This package will not require many of the airframe upgrades recommended for the Bull Moose, so will therefore be less costly for the overall package.  Let's talk about your aircraft mission needs and see if this package would serve you well..

The Heart of the "Backcountry Super Moose"*..  

Customized LS3 Corvette powered Murphy Moose Modifications

The dyno chart shows the "sweet spot" of this engine to be at 5,200 rpm procuding 480 hp and 480 ft-lbs. of torque, which is a perfect match to our 2.11:1 PSRU giving a take off RPM of approximately 2,500 for the propeller.  Engine cruise rpm of 4,000 produces 330hp, 450 ft-lbs of torque, and gives a prop rpm of just under 1,900, making for very strong and economical operation.

LS3 380 hp Components only package:  $36,750.00.  This package includes the same components as listed above for the 480 hp version.

Photo of aircraft 3 1/8 panel mount display head (backlit). With V17-29.2 software, has 4 gauge modes to display, manifold pressure, rpm, engine temperature, induction temperature, battery voltage, fuel flow, injector duty cycle, throttle position, acceleration enrichment, mixture knob position, ignition timing and O2 sensor voltage. Also displays error codes for sensor failures, check engine light feature and allows full programming of the system in flight.​

*ATTENTION:  The "Backcountry Bull and Super Moose" designations and assemblies are proprietary model names and packages developed by MooseMods who hold the exclusive right for the use of those named identifiers..

LS 3 480 hp MooseMods "Plug and Play" package:  $46,000 US.  This as ordered package is ready to bolt to your airframe;  add fuel, engine oil, PSRU gear oil and ready for start up.  Allow 90 days lead time.

​​LS3 "Plug and Play" package: $42,500.00

Pricing for LS3 Bull Moose 480 hp Firewall Forward Package