These radius lifters are what's needed for any radical flathead Ford cam such as the iconic Isky 404 the Crane R-450 and any other cams requiring the radius lifter design. These lifters were ground for me a long time ago actually used them with the Crane R-450 profile. They have very limited run time and are in excellent condition. I'm asking $250.00 for the set which is a lot less than what they cost me. Shipping would be extra. Send me a PM if interested. Ronnieroadster