After I put on the 'R' cam, the R-sport head, and the Webers I found my delight that my PV's B20 would pull hard up to 7k. This was on a bottom end that had a shade tree rebuild with an IPD 6-bolt big bore kit some 20-ish years and 80K miles ago. It was still pulling hard at 7K, but the balancing was a bit casual and it felt buzzy, and I never took it past there. After about 10 months of 7K zings (I flog the PV fairly hard) it came up lame with a spun rod bearing on #2. The teardown didn't provide any clues as to why it happened - it was full of Mobil 1, no blockages, no problems with the oil pump (other than being a little scratched from eating bits on the #2 bearing). All I can guess is that perhaps the bearing was a little loose, or perhaps the rod a little bent, or - who knows really. But I'll just let that sit out there as a cautionary tale about running past 6500 - any weaknesses in your engine will come to light when pushed hard.

Now that it has a brand new professionally built bottom end (this time with standard B21 FT pistons) and an Isky vv-81 cam (Kgtrimning was out of Kg-16's when I was ordering parts) it pulls like a beast up to 6500. I've gone to 7K a few times and it feels great, but I think I'll try to keep it under 6500 from now on.

I should dyno it some time. Now that it has a few miles on it it feels really strong. I'd be curious to see what it does. it's certainly not the result of some carefully crafted high dollar engine building project, more a collection of interesting performance parts found here and there for cheap.
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I'm JohnMc, and I approved this message.