Availability: Due to Popular Demand current lead time runs about 18-22 weeks Fully insured shipping will be quoted. (Usually $500-700 on average). Additional fees for residential and liftgate.
432-439cu. in.
Starting at 400-475 HP
ON PUMP GAS!
All engine kits purchased online either via a deposit or paid in full, will be meticulously reviewed by one of our engine techs. We will will send you a formal, itemized build sheet before starting the machining process. We want to ensure the engine kit will meet your application and any necessary changes, upgrades, or final details can be made at this time.
We start with the exact same blocks you would build on your own. It's what we do to take these old dirty blocks that you see here to a beautiful custom built Butler engine. It takes many critical steps in order to become the proper foundation to be a custom Butler Performance engine.
Step 1- 3 Step Cleaning Process
-Baked, Blasted, and Cleaned
Step 2- Visually Inspected
Step 3- Magnafluxed/Sonic Tested
Step 4- Replace Dowel Pins
Step 5- Align Bored (if required)/ Align Honed
Step 6- Bored and Honed with a Torque Plate
***Due to the fact that these 40 plus year old blocks cleanup of cylinders varies on a block to block basis. Therefore your final bore size will be determined at this step. Sufficient wall thickness will be verified once again regardless of final bore size. We will select the smallest bore available for your particular block unless you request a larger bore size/larger cu.in.***
Step 7- Square Decked
Step 8- Deburred/ Final Multi Prep Process
(It takes over a full days work for the final prepping process. Including tapping all bolt holes and cleaning all oil galleys)
Step 9- Final Jet Wash/Cleaning/Wipe Down
Step 10- Ready for Assembly
All rotating assemblies sold by Butler Performance, regardless of brand, are neutrally balanced in our shop by our experienced machinists.
Images show assembled with optional parts. Contact us for detailed quote for your application and specifications.
Drive, accessory pulleys, and March Serpentine systems sold separately
Air cleaner or drop base sold separately
Don't sweat the details. Once order is places one of the Butler Engine Tech's will contact you to finalize any details related to your specific car, application, and final details. Some of these details will be valve cover logo, breather location, and any other parts needed for your specific application. We will answer any questions you may have and get your build processed and in line for machining.
