CNC Ported cyl. Heads
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Holden Heads
CNC HOLDEN VN RACE PORT CYLINDER HEADS
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HOLDEN VN CNC RACEPORT ASSEMBLED CYLINDER HEADS
Recommended Use & Info:
These heads are CNC ported to suit a larger 2.02" intake valve and are primarily recommended for 355 + cubic inch engines that will be revved to 6500+ RPM.
Results
On a 355 c.i motor on our Engine Dyno these cylinder heads have produced 459 Ftlbs and 557 HP @ 7300 rpm with a "street" roller camshaft, Edelbrock Victor JNR intake and 750cfm Holley Street HP Carby.
In a race engine with more compression and an aggressive true solid roller camshaft 600HP would be possible.
On the track these heads have ran:
10.50 @ 127 in a LH Torana. ( Carburetted with single 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 FT Camshaft | H355H301S | $ 2782 |
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Consists of : |
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| 2.02" X 1.625"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 FT Camshaft | HC355H3011 | $ CALL |
| Consists of : | ||
| H355H301S ASSEMBLED CNC HEADS | ||
| Solid Camshaft ( PT304H-S253 ) |
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| 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
OUR CNC RACEPORT HEADS PROGRAM ALSO INCLUDES MACHINING
THE ROCKER POSTS FOR SCREW IN STUDS AND
VALVE SPRING PADS ARE ALSO MACHINED TO 1.550" O.D X .720" I.D
(ISKY 8005A AND 9005 )