Re: Tuning my 3.0 SC, 204hp ROW engine
Posted: Mon May 09, 2016 7:32 amHere is what I wrote: "964 and 20/21 cams can be used without piston-to-valve contact, however anything with more lift/duration requires careful measurement and piston modification to work. We have used Mod S cams with these pistons, but we had to machine them to fit."
Note that I mentioned the need to machine them to fit.
I have used Mod-S cams with the wedge-dome pistons several times, however one needs to machine the intake side a little bit for valve clearance. The drop in CR is small and its well worth the effort.
Certainly, this requires the engine builder to measure piston-to-valve clearance and have access to a lathe, but none of these procedures are difficult to have done. I assume you have the ability (or have some assistance) to make those measurements and I'd assume you have a local machine shop that can machine the intake side of the pistons for additional clearance.
Note that I mentioned the need to machine them to fit.
I have used Mod-S cams with the wedge-dome pistons several times, however one needs to machine the intake side a little bit for valve clearance. The drop in CR is small and its well worth the effort.
Certainly, this requires the engine builder to measure piston-to-valve clearance and have access to a lathe, but none of these procedures are difficult to have done. I assume you have the ability (or have some assistance) to make those measurements and I'd assume you have a local machine shop that can machine the intake side of the pistons for additional clearance.