Originally posted by C. Ludwig:
To tell the difference of the "block" look for the EGR valve. S4s have them on the top of the center housing. S5s have a machined flat where the valve used to be.
S4 it is - bummer. I've got a full set of new S5 housings, and see the difference you described. All 3 of my engines are S4.
<font face=\"Verdana, Arial\" size=\"2\">The important thing is the rotors. The S5 rotors have the combustion dimples machined in the rotor with a fairly smooth surface. The S4 rotors have a cast combustion dimple.</font>
Anyone know where I can pick up a couple S5 rotors?
<font face=\"Verdana, Arial\" size=\"2\">After driving both Torsen and clutch type cars I like the Torsen. The only problem is that Torsens will still unload if a wheel comes off the ground. May be a problem heading in to the bowl at Grattan? That's the only place I've been that I can really see a problem. </font>
Yeah, I've been smoking the right rear through that corner. I also hear a little RPM blip cresting the rise on the long sweeper after the bowl.

Thanks,

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Marty Doane
ITS RX7 #13
CenDiv WMR