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Holden Heads

CNC HOLDEN VN RACE PORT CYLINDER HEADS

HOLDEN VN CNC RACEPORT ASSEMBLED CYLINDER HEADS

 

 

Recommended Use & Info:

These CNC ported Holden VN-VT cylinder heads have enough airflow to produce over 560HP normally aspirated. These heads are CNC ported to suit a larger 2.02" intake valve and are only recommended for 355 + cubic inch engines that will be revved to 6500 + RPM. These heads are NOT recommended for 304 cubic inch engines.

Results

On our Engine Dyno these cylinder heads produce a genuine 455 Ftlbs @ 5350 RPM and 523 HP @ 6750 rpm on our 355 cubic inch Gold Pro mule motor.

On the track these heads have ran:

10.50 @ 127 in a LH Torana. ( Carburetted with single plane Harrop intake  )

10.70's @ 125 in a LH Torana. ( Carburetted with DUAL plane Harrop intake  )

10.80 @ 123 MPH in a Full body VN Street Driven commodore - ( Twin throttle body injected. )

 

Heads are crack tested then ported in our 5 Axis CNC machining centre. Whilst still in our CNC the cylinder heads are also machined for screw in studs and the spring pads are cut to suit ISKY dual with dampner springs. All new Genuine K-LIne bronze valve guides are fitted which they are then honed to exact clearance. New Stainless Steel valves are backcut and valve seats are recut using mutli angle / radius cutters. Heads are surface milled and then final washed. In the assembly process we also measure and adust every single installed height to achieve the desired spring pressures.Heads are assembled with springs to suit either a flat tappet ( solid ) camshaft or our hassle free street roller camshaft.

 

Description Pavtek Part # Price
CNC VN  Race Port Assembled Heads   - To Suit Solid Camshaft H355H301S $ 2782

Consists of :

   
2.02" X 1.650"Stainless Steel valves    
Springs - Isky 8005-A Dual with dampner springs    
Retainers - Chrome Moly 10 Degree    
Valve Locks -Machined 10 Degree    
Valve Stem seals - Crane Teflon    
5 Axis CNC Porting -  Intake 100 %/ Exhaust 100%    
Crack  test of cylinder heads    
Multiangle Valve Seat Geometry    
Backcut valves    
K- Line bronze valve guides - honed to clearance    
Surface milled    
Guides machined to suit teflon seals    
Rocker posts machined to suit screw in studs    
Spring pads machined to suit Isky 8005 or 9005 Springs    
Springs measured & setup to suit cam to be used    
Final washed and assembled    
     
     
VN CNC Head & Cam Package: With Solid camshaft HC355H3011 $ CALL
Consists of :    
H355H301S ASSEMBLED CNC HEADS    
Solid Camshaft ( PT304H-S253 )
   
16 New Solid Cam Lifters    
     
VN CNC Head & Cam Package: With Street Roller Camshaft HC355H3012 $CALL
Consists of :    
H355H301SR ASSMEBLED CNC HEADS    
Street Solid Roller camshaft (PT355H-STR252)    
Crane .842" mechanical roller lifters    
     
     
VN CNC RACE PORTING ONLY: CNC355H301 $1042
5 Axis CNC - Intake 100% / Exhaust 100%    
Includes machining heads to suit screw in studs    
Includes machining spring pads to suit Isky 8005A or 9005 Springs    
No other prep work included    

 

ALL PRICING ABOVE IS BASED ON CHANGE OVER OR MACHINING OF YOUR CYLINDER HEADS

CORES ARE AVAILABLE AT AN ADDITIONAL CHARGE- CALL FOR CURRENT PRICING