When HPP left Racekrafters' shop the last time, The Mule performed quite admirably with the out-of-the-box Edelbrock cylinder heads installed. It produced 502.8 hp and 570.7 lb-ft of torque. As always ...

In the first installment working with our 402 big-block (9.5:1 compression), we swapped out our factory oval port, cast iron heads for a set of alloy heads from Trick Flow Specialties. Without ...

If one thing truly leads to another, you can say the head and exhaust swap we performed on the Balls of Fury (Charlie and Chad Pirchio's '64 Sport Fury) in the August '13 issue (Two Bolt-ons Bring 81 ...

As a refresher, we started out with a bone-stock '87 Buick GN, base-lined it, then progressively dyno and strip tested a host of proven bolt-ons. Each time we tried a new upgrade, we visited our ...