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Return to Parts List Category : E- Big Block (Raised Deck) : Cylinder Heads HUG STEALTHCNCPORTED CNC PORTING ON YOUR STEALTH HEADS CNC PORTING ON YOUR 440 SOURCE "STEALTH" (RPM STYLE) HEADS $1660.57 This part number is based on the customer supplying brand new 440 Source Stealth Heads (add $125 if heads have been run).They will be fully CNC ported on our state of the art  5 Axis CNC machine. This level of porting is meant for maximum effort engines. This part number includes the following: Customer supplied, pair of newStealth New one piece, chrome stem. 21-4N stainless 2.190" intake valves New Ultra blend flouroelastomer Viton valve stem seals Fully C.N.C. port a pair of heads Finish detail work, exclusive racing valve job, minimum mill heads, clean & reassemble with Stealth exhaust valves, springs, retainers and locks. CNC porting of the heads will increase the overall chamber size. If you need the heads milled to a certain cc or are trying to achieve a specific compression ratio,  let us know and we can quote you a price on milling. The test results below show the flow numbers from 3 different flow benches. The first is our custom in-house bench. The second is a SuperFlow 600 and the third is a SuperFlow 1020. The chart below shows flow numbers before and after our CNC porting work on a set of Edelbrock heads. Although your flow numbers should be similar to these, they may vary some due to the poor quality control of the import heads.                                                           Intake                         Exhaust Lift Hughes Bench S/F 600 S/F 1020   Hughes Bench S/F 600 S/F 1020 .100"  80 80  84   82 82 83 .200" 155 157 156   107 108 109 .300" 224 225 227   159 160 161 .400" 272 275 277   193 196 199 .500" 298 301 307   220 224 228 .600" 310 316 324   229 236 241 .700" 317 321 325   241 248 250