With the ignition timing set at 34 degrees and 84 jets all around, Brul loaded the engine against the brake for a partial pull, and we saw 374 hp at 5,600. Upping the rpm a couple of hundred at a time to find the peak, we found the top at 382 at 6,200 rpm, and we hadn't yet started tuning. We noted that the oil pressure was quite high with the 20-50W oil sloshing in the sump at more than than 95 psi. It looked like a power drain to us, so we changed to a 10W30 Royal Purple synthetic that netted us a fat 394 hp at 6,100. We were so close to 400 hp that we could taste it, so we shuffled a Wilson 1-inch tapered spacer under the carb and the 318 responded by dealing up a 400 hp dyno curve, with peak output at 6,100-6,200 rpm.