If you are over 500hp with your 6bt, the cylinder pressures dictate that you step up to our extreme duty pushrods which consist of a 10.5mm .120″ wall. OEM pushrods have a buckling strength of 1780lbs these pushrods have a buckling strength of 5000LBS! The best pushrods at the best price from 500hp to over 2,000hp these pushrods are your answer!