This is a 28.5/25 5.5mm valve stem Head. The chamber size is 18cc. Wide exhaust studs for better positioning of exhaust port. (Your current exhaust pipe may need to have mounting holes enlarged or slotted to fit.)
Can fit directly on a Tillotson, Honda / Clone and Predator engines, Best suited for 212-225cc but can work on even bigger engines. Accepts all Non Hemi style valve trains.
The SHRED-HEAD is everything you want in a bolt on cast head! This head was designed with performance in mind. intake mounting spacing is wider than standard clone heads, it allows you to mount a flange style slide carb directly to the head or accepts large style intake manifolds for larger carbs and more flow. This head comes with either steel or stainless steel valves. Head comes Ready to go for 400 lift and 7500+ RPMs. but is capable of over 450+ lift and 10,000+RPMs with the correct set up. This head is bolt on HP over your stock style head and can become even better with some basic port work.
Steel option comes with our 26# springs installed
Stainless steel option comes with our light duals and titanium retainers for higher lift and higher revving.
This head DOES NOT work with stock style carbs with out a custom adapter.
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It says nowhere in description what size the springs are, only that it's ready for a 400 lift. I'm assuming they are 26 or 28lbs?