I was disappointed. I am trying to figure out where all my HP went?? Hahahaha. But seriously I was surprised, maybe even shocked. Good compression, good heads, port matched, ports aligned, the air fuel ratio is a little rich but overall it was good, timing I think is typical pontiac good (I am going to check that again), I degreed the cam, good spark, I expected more from the camshaft (with 1.65 rockers even) as it didn't make power past 5000 and we pushed it to 5700, Is it the exhaust is holding it back......and the cam does have a little more in it? Maybe the flex fan? Is it as simple as just an accumulation of drivetrain loss, flex fan, exhaust, and accessory loads?
Not that I am horsepower chasing, but when you have attention to detail and use parts that should perform a little better you want it to perform to its potential. As stated prior the car has very good throttle response and pulls through entire RPM range, easily breaks the Nitto tires loose when snapping the thrrottle in first gear half throttle driving speeds, spins them pretty good at 2nd gear shifts. The dyno runs shows it running smoothly with no hickups.
The TH400 is power hungry, I have read of real world tests where they take more than 25%, see article below for a real world test and the reality of big auto transmissions stealing your power.
https://www.hotrod.com/articles/ccrp...in-power-loss/