You know that gut drop when your car starts to sound or feel off. Maybe it's a strange shudder, a delayed shift, or that dreaded warning light on the dash. You take it to the shop, hoping it's just a ...

Ken Zimmer swapped a 351-Windsor into his 1967 Mustang convertible. Equipped with 1969 351W heads, the slightly over 9:1 compression motor sports a mild flat-tappet hydraulic cam (0.472/0.496-inch ...