Classic Austin Mini Longman 1275 Unleaded Cylinder Head

Classic Austin Mini Longman 1275 Unleaded Cylinder Head

Classic Austin Mini Longman 1275 Unleaded Cylinder Head

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.

Note: Longman cylinder heads are special order items and can have lead times of several months. Full deposits are required when ordering. Orders are cannot be canceled and there are no returns accepted.

Recommended items for: GT6
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Related Technical Articles:
Cylinder Heads Identification, Austin, Midget, Sprite, Morris
Created: January 30, 2000
Everybody has their own opinion on this subject. The most experienced people will tell you that the best way to maintain your engine performance is to accept the fact that valve jobs need to be done 2 or 3 times more often than rings and bearings! And this data base was concluded when leaded gas was the norm! Now that unleaded is all you can get, valve jobs are needed even more often! The purpose of a valve job is two fold; first the valve seats. The impurities in the air and gas often get trapped between the valve and the seat in the head; under worst conditions stopping the valve from closing, but more commonly being smashed enough to allow just a little seepage of hot gases.
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