The ultimate basis for power generation on pre-injection Holden V8 engines using “Pre-EFI” style intake manifolds and exhaust 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” inlet valves. Yella Terra cast alloy intake manifold spacers are supplied to reposition manifold face to match revised port location. Exhaust port location matches standard performance exhaust flanges. “Dash 3” bare heads come with semi finished seat inserts fitted ready for cylinder head specialists to perform further modifications and finish seats to their preferred specifications. Yella Terra “Dash 3” heads are machined for 7/16 UNC threads to suit screw in studs or Yella Terra 7/16 shaft rocker systems. The alloy castings offer a 50% weight reduction over standard cast iron heads. NOTE: 'Bare Heads' have been finished machined with brass guides fitted not reamed, valve inserts fitted without valve seats cut and material left on the joint face for final milling. Features: 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
The ultimate basis for power generation on pre-injection Holden V8 engines using “Pre-EFI” style intake manifolds and exhaust 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” inlet valves. Yella Terra cast alloy intake manifold spacers are supplied to reposition manifold face to match revised port location. Exhaust port location matches standard performance exhaust flanges. “Dash 3” bare heads come with semi finished seat inserts fitted ready for cylinder head specialists to perform further modifications and finish seats to their preferred specifications. Yella Terra “Dash 3” heads are machined for 7/16 UNC threads to suit screw in studs or Yella Terra 7/16 shaft rocker systems. The alloy castings offer a 50% weight reduction over standard cast iron heads. NOTE: 'Bare Heads' have been finished machined with brass guides fitted not reamed, valve inserts fitted without valve seats cut and material left on the joint face for final milling. Features: 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

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