Yeah I believe the main cause was clearances weren't correct as they were under a thou on the bearings now its setup with just under two thou. So the motor isnt as tight plus theres no fuel mixing with the oil.Just get the rods rifled drilled and should be sweet. we also had some issues with the atomic oil pump and oil pressure which we contributed to the rods being rifle drilled. But ended up being the atomic oil pump needing the spring and valve adjusted to accommodate the ported housing. Your running just the spool gears so should be all good