I've now got Rick's '77 C3.0, with the engine that he describes above, shown in the picture below. He did a beautiful job on it, cosmetically and mechanically.
It only had about 1,000km on it when I bought it, so I'm still kinda running it in at 5,000km now. I expect to dyno tune it soon, and will report results here. The engine pulls very smoothly, and seat of the pants says the engine is more than 11% stronger (capacity differential) than my rebuilt 2.7RS-spec MFI, 9.8 compression Mahle P/C engine. We can't quite get the 3.0 to idle as smooth as the 2.7, however. Given that Rick did everything fresh and right - Matt Blast on the t-bodies and stacks, Gus on the pump, S cams, etc. - it's not clear to me why we can't get it quite as smooth yet. The A/F readout on the dyno will be helpful there.
Also, in trying to better understand the original Porsche 3.0RS set-up for comparison, I've corresponded with Matt Blast at Eurometrix and Aaron Hatz at Flat 6 (he has rebuilt at least one original 3.0RS). Both believe that the 3.0RS intake set-up was pure 2.7RS - 36mm intake ports, 312 plastic stacks, S/RS T-body specs, S cams, RS space-cam, etc. Porsche reported the 3.0 hp at 230 at 9.8 compression, vs. 210 and 8.5 for the 2.7. I have to believe there is more than +20hp, however.
Having been disappointed with the leak issues of a magnesium case (even with all the case work done), and experienced the power and torque differential, I'm a real fan of the 3.0MFI. But I still have a stock '78SC 3.0 in a DE car, so am interested in hearing about others' experiences with more aggressive 3.0MFI engines.
Best,
Bob
