IIRC the AfCo "Big Gun" valving is a more aggressive window, extension wise for radial type tyres. I have them on mine. With Caltracs there was way too much hit for a bias ply and they would wad the tyres up pretty bad, so much we ran out of extension adjustment and had to compromise with tyre pressure. After switching to radials I got Menscer to re-valve all 4 corners. The Menscer fronts didn't seem to control the wheelstands and we ended up doing some damage to oil pans, headers etc At the beginning of this season we stumped up for Santhuffs for the front. The Santhuffs made a big difference and by the end of the season we had picked .06 in the 1/4. Buy the best you can afford and you wont have to replace when things "grow" so often. DAMHIK
Below is link to a typical pass
https://www.youtube.com/watch?v=D4B_QewPIhc