I broke the eagle cast crank in my 410. I took it to the dyno (chassis dyno) it only made 355 rwhp. When I drove it home I thought the engine was a bit rattly. The next day I pulled up at a stop light with my window down and thought gee that car next to me must be a diesel because it rattles. But when I reved mine up to take off I relized it was mine rattling. Took it home and pulled the sump off and checked the bearings but all looked fine so put oil back in and started it up but would rattle when you reved it up. I noticed the balancer was wobbling a bit. I put a screw driver behind the balancer a pulled the balancer about qtr inch forward. Ha broken crank! pulled the motor down and after taking the front off the motor the front of the crank just fell out. I bought a steel stroker crank and rebuilt that engine with forged pistons and scat rods and have never looked back. The engine now puts out 425 rwhp ( nearly 550 at the flywheel) No other damage to the motor other than the crank and it drove fine just rattled a bit when you reved it.
