We show you how to upgrade your Ford GT40P heads with help from Comp Cams, Lunati, Trick ... The GT40 valve sizes are 1.85/1.54 for the intake and exhaust, while the GT40P went to a smaller 1.46 ...

North Carolina–resident John Demolet is the proud owner of this 1989 5.0 convertible. He has added GT40P heads, ported high-output intake, a 70mm throttle-body, a 75mm MAF, and an E303 cam.