Developed this motor last summer season for a drag boat, it's a 4 bolt primary 454, over 500 cubic inch, aluminum heads entirely re worked all brand-new springs and valves and lifters, custom-made camshaft, this is a custom-made developed race motor, created rotating assembly, has less than 10 hours on this thing! Had heads totally redone, blower completely new, all new rotating assembly, created rods, Keith black pistons. Two 750 holly carbs. 1000hp bolt n run, set up for a v drive, has a dooly v drive pan on it now., magnum cam driven water pump, joe hunt magneto, this motor is fully constructed and please just serios purchasers, I 'd dislike to squander both our time! 30, I have more than 30 k invested., $18500 obo,.