i use the DOUG'S "452" in my 70 runner 440 6pak, 2",fit is perfect, no more burnt plug boots, easy access to plugs, the heavy flange i think is key to them be leak free,got the ceramic coated and 2 years later still look new, i have no power steering and mine is an automatic, but they are a perfect fit, i did tilt the motor to drop in passenger side, but never even scratched the paint installing