BHJ balancers are a press fit. I had to hone the bore on mine to get it on my forged CAT stroker crank with an installer tool I made from an A/C clutch installer bearing, washer, and a long grade 8 bolt. A stock balancer should slide on easily, but should have no play in the bore. I have a spare engine with a TA internal balancer on an RPM forged stroker crank, and it slips on nicely with no play. Make sure your balancer is not cracked. If you can slide it on and it does not rock, you should be OK. If it rocks, You may want to call Eagle.