Here are some pics of PRW stainless rockers on Trick Flows. The geometry is perfect. If the rocker will fit under the valve cover, it can be "adjusted" to have perfect geometry also, at least on the valve side. The Harlands are not going to be better than any other rocker when just bolted on.
I dynoed this 505 build on Monday, and I was pretty happy with the results.
Just to set the stage, the customers demands were that it:
1-Make 600 Hp
2-Be easy to drive
3-Run on pump 93
4-Fit under a stock hood
5-Sound rowdy and mean. (I had to talk him back from the edge on this one)
The application was a '70 RT/SE Challenger with a 727, 2800 advertised stall, 3.91 gear, that will be mostly cruised to and from car shows. He told me the only reason he wanted 600 Hp is because someone else told him that's what he should shoot for. Okey dokey!
I pretty much built a similar combo to what Trick Flow advertises for their dyno results. Here are the differences:
Cam is similar at 242/248, but less lift at .585" vs .600", and a different lobe separation.
Compression is 10.1:1 vs 10.5:1.
Cubic inches are 505 vs 446.
Intake manifold is a low dual plane with a 1" open spacer vs a tall single plane.
Carb is a 1000 cfm Holley with annular boosters vs the 950 Trick Flow.
The only plusses to this combo, over the Trick Flow, is the cubic inches, and the bigger carb. The cubes make more torque, but horsepower stays about the same at a lower RPM. The carb could have been a little bigger yet but worked beautifully for this combo. Everything else, theoretically, should cost power.
Results:
617 Hp @ 5600 rpm
656 Tq @ 4000 rpm
The torque was 627 at 3500 where the pulls were started, and stayed over 600 through 5300 rpm. I'm certain it would have been over 600 at 3000 but we ran out of time to do additional pulls at lower rpms. With more time, I think we could have picked up a few more but we didn't need to be greedy. That brings me to a question.
Has anyone had any trouble with the Trick Flow heads not purging the air from the cooling system? We spent all morning trying to get the motor to stop running too warm during the warm up before starting pulls. I had the same trouble running it on my test stand before going to the dyno, and once the air gets out it is fine. It just seemed to take a long time. I had to run for some parts, and left the electric pump run for about an hour on my test stand, and it still didn't clear the air.
