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Holden Heads

 

HOLDEN V8 VN CNC

"COMP PORT" CYLINDER HEADS

 

 

TECHNICAL SPECIFICATIONS :
Intake Valve Diameter: 2.020"
Exhaust Valve Diameter: 1.600"
Intake Port Volume: 178cc
Exhaust Port Volume: 76cc
Chambers CNC Machined No
Chamber Volume:Raw 62cc
Spark Plugs Angled
Minimum Intake CSA 2.465"
Maximum Intake CSA x.xxx"
Minimum Exhaust CSA x.xxx"
Maximum Exhaust CSA x.xxx"
Intake Seat Angle 45
Exhaust Seat Angle 45
Flow Test Bore Size 4.000"
Exhaust Flow figures with pipe          YES 1 7/8"

 

 

VALVE LIFT
.100" .200"
.300"
.400"
.500"
.600"
.700"
.800"
.900"
1.000"
Intake Flow @28" H2O 63.3 148.1 194.3 232.3 259.6 279.7 293.1      
Exhaust Flow @28" H2O 50 105.4 146 171 184.6 200.3 206.5      

Flow figures are not inflated for sales purposes.

Calibration is performed on both Intake & Exhaust side of bench from 50 to 450 cfm using 11 sharp edge orifice plates.

Flow bench numbers should not be the primary concern when purchasing your next set of cylinder heads.

Porting for Power ! NOT Flow Bench Numbers - Click Here for more info

 

RECOMMENDED USE AND INFO:

Suitable for 355+ cube stroker engines. 7000+ RPM

Heads must be used with a minimum extractor primary pipe size of 1.875" (1 7/8") OD

 

 

Description Pavtek Part # Price  
5 AXIS CNC PORTING ONLY:    

5 Axis CNC Competition Porting - Intake/ Exhaust

Includes cutting springs pads to suit dual springs ( Isky )

Includes machining of rocker stands to suit screw in studs

Does not include cleaning, crack testing, valve guides, milling etc.

CNC355H401 $ 1042
     
Assembled Cylinder Heads - To suit Solid Flat tappet or Street Roller Cam
H355401S $ 2782

Consists of :

   
Valves - New Stainless Steel Intake & Exhaust  - Ferrea    
Springs - ISKY Dual With Dampner    
Retainers - New HP chrome moly retainers    
Valve spring pads CNC Machined    
Valve Locks - Comp Cams Chrome Moly    
Valve Stem seals - Crane teflon    
5 Axis CNC Competition Porting - 100% Intake/ Exhaust    
Multiangle Valve Seat Geometry    
Backcut valves    
KLine Valve guides fitted and diamond honed to size    
Surface milled to your desired CC's    
Springs measured & setup to suit cam to be used    
Final washed and assembled