Classic Austin Mini Gt7 Longman Unleaded Cylinder Head 1.21 X 1.4

Classic Austin Mini Gt7 Longman Unleaded Cylinder Head 1.21 X 1.4

Classic Austin Mini Gt7 Longman Unleaded Cylinder Head 1.21 X 1.4

The latest and greatest from Longman is a cylinder head that has the same valve sizes as the early BIG valve "S" head (1.4" Intake, 1.21: Exhaust), AND that now is setup for unleaded fuel! The 21cc combustion chamber can be made smaller but this is slightly smaller already than stock; thus everything else being equal, the compression should be slightly higher.
The GT7 cylinder head has performance that you can not match for twice the price! Flow bench tests and a survey of competitive price in either the UK or the US have proven the GT7 head from Longman is the champion.
All Longman heads are fully ported and polished and come assembled with Longman's valves, silicone bronze guides, springs and retainers, Valve seats are flame hardened for use with unleaded gasoline.
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: C-AHT464
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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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