ng8264723 Chris Jay B. has done alot of work with intake swaps and exhaust headers. He is going to write a book. Yes the FE heads are not the best flowing in the world BUT, AGAIN you can't compare all these manifolds on 1 dyno mule motor. This motor made over 100 pulls. The cam was not changed to match the intake manifold rpm limits. Same with the heads, how much porting was done to them. Compression of the motor. This is way they have 2 different motor build programs out on the market. If you put the correct numbers in you will get within 5% of the real dyno numbers. Msgt Craine will flow any manifold to get the ports within a 5-10% equal flow. Some ports there is a 40cfm differents between runners. The streetmaster was best overall because this manifold BEST matched the motor it was on. I have an FI motor. with a 6G limit. Big flat tork curve. Over 400 ft to 4,600 rpm and HP tops out at 5,400 rpm. The manifold is single plane that I made for my FI system. This is not a good match of cam and manifold. By changing some things like Flywheel wieght, Valve springs, and spacer for the throttle body, the motor has picked up some power and is sharper on running in a 2,700 lb car. Work on maken a good driviable motor for the car. I run 12.5 in the 1/4 mile. Car has a smooth idle, runs strong, and on reg gas. You can build a 480+ cube motor that will haul A$$ and still be easy on parts. I think it was great what Jay did, but like in other test done, ALL the parts are not matched for that motor. This is way Companies put specs in the writeups to match parts and show the power they added to a motor. Alot is done with mirrors and lights.
. Jay's Dyno room is not going to give you the same readings as say, a dyno in Cali or N.J. When you build your motor, don't worry about 600HP, 400HP is a hand full in a cobra.
Bigger is not always better unless your other half is in the same room as you.
Rick L.