Description
Note for Assembled Heads – Our Assembled 6 Cylinder heads are setup for .470” Max lift. If your engine configuration will exceed .470″ lift at the valve, it is recommended you purchase our Alloy 12 Port head as a Bare 74cc or 68cc and source your own Valvetrain to your required specs.
TECHNICAL SPECIFICATIONS BARE HEADS
Material: 356 Alloy Heat treated to T6
Chamber Volume: 72cc – also available in assembled 56cc (Standard Comp) & 48cc (Hi-Comp Road Racer)
Inner Runner: 82cc
Exhaust Runner: 71cc
Intake Valve: 1.740”
Exhaust Valve: 1,480”
Valve Guides: K Liners
Valve Seats: Inlet Cast Iron 1.812”x .250” / Exhaust Nickel Chromalloy 1.625” x .250”
Spark Plugs: Tapered Seats
Installed Height with Std Valves and .060” Valve Spring Insets/Shims 1.520”
Spring Seat OD. 1.250
YELLA TERRA ROLLER ROCKERS TO SUIT:
• Yella Terra YT 5008 (1.5 Ratio – 7/16″ Stud Mount)
• Yella Terra YT 5029 (1.5 Ratio – 7/16″ Shaft Mount)
• Yella Terra YT 6312 (1.6 Ratio – 7/16″ Shaft Mount)
• Yella Terra YT 6332 (1.65 Ratio – 7/16″ Shaft Mount)
• Yella Terra YT 6371 (1.5 Ratio – 7/16″ Shaft Mount)
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