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Heads, Inc. These castings are typically assembled with 2.00" intake and 1.56" stainless steel exhaust valves from REV, Inc. The springs, retainers and 1.6:1-ratio Pro Magnum roller rockers come from Comp Cams. After the heads were assembled, Osucha installed them using Fel-Pro gaskets (part number 1003).
     Bolting a stock Tuned Port system to the intake side of the CNC-ported heads would have been analogous to installing a Geo Metro exhaust system on the outlet

TPI Specialties offers both 52mm and 58mm throttle bodies for L98 and LT1 engines. Testing has shown that 350 cubic inch engines respond best to a 52mm throttle body. The airfoil up front is another flow-increasing component that maximizes the power potential of a Tuned Port System.

so if prodigious volumes of air and fuel don't flow into and out of the combustion chambers, power output will be restricted. Unless you've devoted your life to rotary, two-stroke or flathead engines, it shouldn't come as a shock that cylinder heads are crucial to any quest for serious power.
     Osucha has found exceptional performance potential in original equipment 1988-1991 Corvette heads that have been modified by CNC Cylinder

Here’s something that’s rarely seen outside of a CNC-programming facility–a computer-generated profile of a port. After port modifications are flow tested and finalized, the port contour is translated into digital data. It’s then used to generate the cutting paths that CNC-machining equipment uses to make port modifications. CAD drawings like this allow the programmer to visually inspect the contour and make dimensional checks.

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