You said in an earlier post, "You may have noticed that this engine was built for high rpm power, and not for torque. Many people may assume I'm going to use a 3.18 final drive ratio in the rear axle, and a Getrag with a .805 OD. But with only 3 miles to accelerate to maximum speed, I chose a different philosophy, trying to place the engine's peak power at the projected top speed. To add to this, I'll be trying to accelerate on either salt (Bonneville) or dirt (Muroc and El Mirage). Too much torque wastes time spinning tires. So I'm going to use a 3.90 final drive, with a Quaife close ratio racing tranny (2.25/1.58/1.21/1.00 ratios), and 205/55ZR14 Michelin tires (22.87" tall). "
And then you said, "I'm not looking for a header tuned for maximum power at that rpm though. It's a compromise, looking to fall between peak torque and peak power. It's all about the acceleration through the rpms, not the hp number at the end of the run."
You also mentioned shifting at 9400 rpms and hoping to run through the traps at about 9,000 or so. IF you tune for a compromise between the Torque peak and the Power peak, I don't think that you will pull close to the Power Peak under that kind of speed load. I know that you have to accelerate up from your peak torque number or whatever lower figure that your gearing drops you to with each shift, but without the power near the Peak RPMS that you are pulling for the run, you MAY not be able to pull those rpms/mph. As far as your friend with the track car, And Opels generally need longer tubes anyway...."I used to run 36" tubes on my friend's circle track car...everyone said it was too long, but the power band was broad....5300-8800 rpms with 192 hp with a 2-bbl Holley carb!" His track run is completely different than a top speed attempt. You have to remember that you are de-stroking this engine in order to better run higher rpms, not to enjoy the mid-range power. Mid-range is a nice function for street cars. That is OK, I don't run at Bonneville and you will tune for what you understand anyway.