Spec: 33mm intake, 28mm exhaust, combustion chamber volumn 23cc. This is the ultimate "small bore" head in the 12G202 casting. All Longman heads are fully ported and polished and come assembled with Longman's exclusive valves, guides, springs and retainers. Also fits Sprite, MG Midget & Morris.
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.
Spec: 33mm intake, 28mm exhaust, combustion chamber volumn 23cc. This is the ultimate "small bore" head in the 12G202 casting. All Longman heads are fully ported and polished and come assembled with Longman's exclusive valves, guides, springs and retainers. Also fits Sprite, MG Midget & Morris.
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.
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.
A selected range of modified cylinder heads are available to suit a wide variety of applications. All port and chamber modifications are carried out by experts to current state of the art specifications. Therefore, actual specifications may alter slightly as gas flow and port velocity efficiency improvements are developed. Where large bore heads are used on small bore engines (i.e. 12G940 casting on 948/1098cc block), it is necessary to check full lift of exhaust valve, and pocket the block as necessary.
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