Hey Jake, you've got all these guys hot and bothered for a type 4 - better start taking numbers - like at the barber shop when people line up. I'll stick with my 2,387 type 1 until the 2,500cc 911-4 goes into the car. Pat broke the input shaft on CB's dyno last week running his new race motor so I have to wait until he fixes it to get bhp/torque numbers.
The 911-4 will be 76.4mm stroke, 102mm Mahle nicasils (from a big bore racing 964 set) 1991 964 dual-plug heads (extra cooling fins and ceramic exhaust port liners), GE60 cam profile (about the same duration as "S" cams but a little more duration), Manley S/S valves with cryo'd springs and titanium spring retainers, Patrick Racing 9.5 lb. billet flywheel with 225mm clutch, Bosh 009 modified for dual ignition, twin ignition rev limiter, a pair of NOS Italian 48 IDA's (with extra transition port), and 10.5 to 1 static compression 9instead of the stock 11.3). The larger 964 piston oil squirters will be used with the late turbo cam feed oil restrictors, a 930 turbo oil pump, and standard 1980's on-engine oil cooler. We'll have to custom build a header system with primaries about 32" x 1 3/4" diameter.