I had my vortec powered '51 GMC on the dyno over this week end and I learned an important lesson - these new motors DON'T like a lot of advance - on 92 octane at WOT 22 degs is all it wants or needs. I thought I had a safe tune up in with 32 deg total but no it rattled real bad.
At the end of the session we had a safe tune up - not fully optimized for power but still made about 210 at the rear wheels. This was in direct drive with the convertor locked up going through a 9" diff. so a 20% loss is not unreasonable. About 250 HP at the crank at 2300' ASL. The air was decent - 95 to 96 KPa.
With just a conical type air filter installed it sounds like Thor's vacumm cleaner thats ****ed off... the thing just roars and arond 3800 rpm the pitch change so I think the oil pressure alone is moving the exhaust cam around.
Once I have the video of the last dyno run I'll post a link..
