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frankydoom,
eturbo is right about not expecting great increases in power from just swapping a throttle body. With no other changes, a bigger throttle body might give you a little more at high rpm. 15 more hp is about 12% increase. I doubt you would get this off just the throttle change. Maybe a wider duration cam & the CIS flapper thing for the fuel mixture off a turbo would get you on up there with 15 or 20 more hp. On some motors advancing the cam timing helps, but from my memory on a rough stock cam check, the stock key & pulley has the cam advanced 2 degrees.
If you want, I'll try to measure the butterflies on a turbo throttle for you to compare. Give me the stock measurements & I'll run it through a hp & torque software program to see if we get an increase with the throttle change.
drew1
obin robinson ported some heads, you might want to email him.
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