Decked the block about 0.060 to get about 8.8:1 (could have gone a bit more but with a torque cam you get static cylinder pressures high fast at 8.8:1 it is about 175 PSI). Oversized valves, simple clean up on the bowl area, nothing fancy (per Doug Dutra), Oregon Cams 2106, Offenhauser dual 1 barrel to get around 350-400 CFM of carb, Dutra Duals with the 2:1 "Y" pipe back by the transmission crossmember (necessary, joining any sooner puts the tuning up higher in RPM, I was aiming for about 3500 RPM and that is where I got it per the simulations. Further back drive that peak lower in RPM Doug Dutra has put the "Y" back a the rear axle to make more really low power) lighter springs in the distributor to get more advance faster, limited the mechanical advance to about 15 degrees to have about 17 degrees of initial and 32 degrees full mechanical advance and then 18 more for vacuum advance (9.5 on the diaphragm).
Rusty's has a much more radical cam and ported heads as he wants high RPM horse power at the cost of lower RPM torque, I wanted lower RPM torque at the expense of high RPM horsepower. This website seems to reduce the size of the images sorry about the resolution. I am making about 245 ft-lbs at 3400 RPM peak and 175 HP were Rusty is at 250 ft-lbs at 4000 RPM and 205 HP at 4700 RPM, but at low RPM I am making over 35 ft-lbs of torque a more driver RPMs. It will take a lot of tuning to get much more. If you think about a 318 the displacement of the cylinder is EXACTLY the same as a 225. If you look at a good head for a 318 you can get 260-280 CFM out of it. Even with Rusty's extensive work on the /6 head it can not break 200 CFM. If we could get a good head for the /6 then you could potentially reach the 300 HP without a ton of tweaking and tuning.
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