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Category : Big Block 413-426-440 (Raised Deck) : Cylinder Heads : CNC Porting for Unlisted Heads

HUG STEALTHCNCPORTED

CNC PORTING ON YOUR STEALTH HEADS

CNC PORTING ON YOUR 440 SOURCE "STEALTH" (RPM STYLE) HEADS

$1390.00

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

Home | Phone: 309-745-9558 | Email: information@hughesengines.com