I think he means the pistons with dome and valve reliefs specific to the Hi Port heads that TFS/Summit sells.Trick flow uses Probe pistons, probe makes them for TFS/Summit. Dont knopw what you mean by Hi port pistons
yes they are the ones im talking about the (high port) is what they stated in summit.I think he means the pistons with dome and valve reliefs specific to the Hi Port heads that TFS/Summit sells.
They are good pistons but keep in mind you must run the TFS high port heads with those pistons.i am planing a 408ci and just wanted to see if anyone has used them, and how well they hold up.