"Longman UNLEADED cylinder head
Longman's typical and excellent workmanship has been applied to these
ported street heads. Intake valves are 1.4" diameter, exhaust 1.15,
the same as late Cooper S, and both inlet and exhaust are Longman's
own stainless valves. Valve guides are the latest silicone bronze
material, and hardened seats are installed for trouble-free use with
unleaded gasoline. As always, the porting and chamber work is top
notch. Longman heads come fully assembled with dual valve springs and
very nicely painted bright red.The GT6 longman head is an 11 stud head
but will work with the 9 stud block also.
Combustion chamber is 21cc as supplied but can be order to your specs."
Suggested annual donation $12.75