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Holden V8 253 -308 CARB Alloy Hi-Port Dash 3 Cylinder Heads (ASSEMBLED HEADS AND (ADJ) ROCKER PACKAGE)

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  • STREET TERRA ROCKERS (ST 2033A) INCLUDED IN PACKAGE
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Price:
$4,399.00
SKU:
ABHA308-3R3
Weight:
10.80 KGS



Product Description

THE ULTIMATE POWER PACKAGE 

490 HORSE POWER 'OUT OF THE BOX!' 

EARLY 253-308 CARBY HI-PORT ALLOY HEADS

PLUS STREET TERRA ADJ. ROLLER ROCKERS

PACKAGE INCLUDES P/No. ABHA 308-3 + ST 2033A

The ultimate basis for power generation on pre-injection Holden V8 engines using “RED” style intake manifolds and exhausts systems.

Raised intake port design radically improves “as cast” flow up to 40% over standard heads. Redesigned water jackets allow individual porting shops ample scope for further improvement with intake flow figures around 260 CFM possible with radical porting and 2.02” valves.

Yella Terra cast alloy intake manifold spacers are available to reposition manifold face to match revised port location. Exhaust port location matches standard performance exhaust flanges.

“Dash 3” heads are available as bare heads with semi finished seat inserts fitted ready for cylinder head specialists to perform further modifications and finish seats to their preferred specifications.

Fully finished assemblies with “as cast” ports are also available featuring 21-4N Stainless 1.940” intake and 1.600” exhaust valves, high lift double springs and chrome moly retainers. These assemblies make an excellent performance street combination with power potential of 490 horsepower out of the box.

Yella Terra “Dash 3” heads are machined for 7/16” screw in studs ready to bolt on stud rockers or Yella Terra platinum race rocker systems. The alloy castings offer a 50% weight reduction over standard cast iron heads. 

 

Technical Specifications 

Material AS 601, 356-T6 Heat Treated Alluminium

Minimum Hardness 88HB

Weight Bare 10.8kg - Assembled 12.7kg

Combustion Chamber Vol 56cc

Deck Thickness .575”

Inlet Port Dimensions 1.980” High x 1.200” Wide

Exhaust Port Dimensions 1.525” High x 1.170” Wide

Inlet Valve Size 1.940” Min

Insert Size 2.100” X .250”

Exhaust Valve Size 1.600” Min

Insert Size 1.625” X .250”

Spring Pockets 1.50” Dia Min

Material Thickness .420”

Installed Height 1.760” with Standard Length valves and .60” Spring Cup

Valve Angle 5.1 Deg

Valve Position Inlet Valve – Standard Position

Exhaust Valve Position - Standard

Port Location Inlet Raised .600”, Exhaust Standard

Spark Plugs Machined to accept tapered set or washer seat spark plugs

Rocker pads drilled for 7/16” studs

Use YT 5020 or YT 5010 roller rockers

 

 

  ** TO ORDER THIS PRODUCT - PLEASE CALL US (03) 9555-5522 OR USE OUR Enquire FORM AND WE WILL CONTACT YOU TO CONFIRM SHIPPING AND PAYMENT**

 

 


Warranty Information

12 Months

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