"Chevrolet's crate motors are the baseline for all the sanctioning bodies and racetracks," Kershaw says, "so we knew we needed to match those power numbers if we were going to be accepted. That made our goal when designing this engine right at 410 horsepower, which is something we can achieve very easily with an engine this size. So once we hit that power goal we began experimenting with different camshafts to achieve the absolutely flattest horsepower and torque curves possible. I don't want to tip our hand too much, but we've had very good results. This motor makes close to the horsepower goal across a very wide rpm range, which makes it very driveable and will make power all over the racetrack."
To find more for ourselves, we got our hands on one of the first production models ready for service and immediately tore it down to its component pieces. There will be at least one component change-and possibly more-by the time you read this, and overall, we are pleased with the quality throughout. Kershaw says the engines are assembled at a facility in Texas that is dedicated to Ford's performance engines. They are not individually dyno'd, but each Z351SR is cranked and run on a test stand after assembly for approximately 20 minutes to make sure there are no mechanical problems, oil leaks, or other warning signs. We haven't had a chance to dyno this new motor yet, but what we've found so far is pretty interesting. Check out what we found when we took it apart.