We'd have to calculate Ftyler's static compression to get an idea of what his engine could actually do. If he had bumped up his CR to 9.5:1, a longer duration cam and some mild port work, I don't see why 220-260 HP couldn't be done.
There has been much ado about Gross vs Net ratings. The differances between the same engine rated at gross, then net can be huge. However, the larger differances appear on the v8s, where tuning, fuel, exhaust, compression and accessory drag is more apparent than these old low-RPM 6s turning only a water pump and generator.
Prolly the big differances between gross vs net for a I6 would be that the compression ratios dropped at the same time as the switch from gross to net ratings. And the cam profiles were more conservative than pat robertson.
The '62 235 was rated 135 HP@4000 and 220 ft-lb at 2100 RPM. Gross. Of course the 235 went out of production before the Net ratings. But I imagine that the net would still be 100-120 HP because compression could stay at 8:1, and the small accys & exhaust wouldn't make much difference cuz the head design sucked anyway.
