Keith Calver has performed hours and hours of testing to perfect his range of modified cylinder heads. Years of development have resulted in what is possibly the best over-the-counter head in this price range. Sold outright, no exchange. Flow characteristics match or exceed Longman GT-7 head. Available options: Drilling for 11 Studs and/or installation of bypass fitting.
Supplied unpainted.
- Inlet Valves: 35.7mm(1.401") dia. modified original equipment type
- Exhaust Valves: 29.3mm(1.150") dia. modified original equipment type
- Exhaust seats: Latest type Beryllium-based for lead-free fuel
- Valve Guides: Cast iron
- Valve Springs: Nominal 180lb at 0.495" valve lift
- Stem Seals: Latest 'top-hat' design with tensioner springs
- Chamber Volume: Nominal 21cc
- Stage 2 1275 Lead-free "GT" Cylinder Head