Mini Mania
Est. 1974
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Variations below:
Triple Groove A-plus Exhaust Valve 29.5mm Race Quality
Intake
C-AEG569 $29.95
Triple Groove A-plus Exhaust Valve 29.5mm Race Quality
Exhaust
C-AEG105$32.95
Exhaust Valve 1.22 Chrome Stem For 12g940
Exhaust
C-AEG107-CHROME$49.95
Triple Grooved A-plus Intake Valve 35.7mm Race Quality
Intake
C-AEG543$35.95
Exhaust Valve 32mm 1.311 X 3.57
Exhaust
C-AEG570 $49.95
Exhaust Valve 1.04 X 3.44 Triple Groove
Exhaust
C-AEG587 $34.95
Intake Valve 1.22 Triple Grove Late Model
Intake
C-AEG588 $34.95
Intake Valve 1.4 X 3.57 Small Keeper
Intake
C-AEG544 $21.95
Exhaust Valve 1.15 X 3.57 Small Keeper
Exhaust
C-AEG589 $24.95
Exhaust Valve 30.9mm 1.22 X 3.57 Small Keeper
Exhuast
C-AEG107 $39.95
Exhaust Valve (29.4m) 1.15 X 3.57 Small Keeper
Exhaust
C-AEG106 $25.95
Exhaust Valve (29.4m) 1.15 X 3.57 Small Keeper

Exhaust Valve (29.4m) 1.15 X 3.57 Small Keeper

Exhaust Valve (29.4m) 1.15 X 3.57 Small Keeper
1.311" (33.3mm) dia x 3.57 long intake valve.
Our race valves are produced in EN214N steel and require Manganese/Silicon bronze alloy valve guides. They are stellite tipped and use the later narrow, single collet groove and current valve head shapes.
As it is possible, even common, to swap one head for another on 1275 engines, it is quite easy to become confused, or worse yet, confuse the parts-guy when it is time to order new valves! Be aware that if the head has been worked on previously, it may have oversize valves; it may have undersize if seats have been installed. Unless you are 100% sure what is in your cylinder head, it is a good idea to remove a valve for accurate measurement. There are two lengths used (nominally 3.52" & 3.57") three different keepers, (wide, narrow, and three-groove) and many different head diameters! These valves are in stock at Mini Mania!
Note that 12G1316 (Smog-Type), all variations of the 12G940, and the latest CAM head castings all use the following 3.57" long valves.
11 Other Variations Available:
Triple Groove A-plus Exhaust Valve 29.5mm Race Quality
Intake
Triple Groove A-plus Exhaust Valve 29.5mm Race Quality
Exhaust
Exhaust Valve 1.22 Chrome Stem For 12g940
Exhaust
Triple Grooved A-plus Intake Valve 35.7mm Race Quality
Intake
Exhaust Valve 32mm 1.311 X 3.57
Exhaust
Exhaust Valve 1.04 X 3.44 Triple Groove
Exhaust
Intake Valve 1.22 Triple Grove Late Model
Intake
Intake Valve 1.4 X 3.57 Small Keeper
Intake
Exhaust Valve 1.15 X 3.57 Small Keeper
Exhaust
Exhaust Valve 30.9mm 1.22 X 3.57 Small Keeper
Exhuast
Exhaust Valve (29.4m) 1.15 X 3.57 Small Keeper
Exhaust
Related Technical Articles:
Valve Stem Keepers
Created: October 10, 2011
Call them cotters, collets or keepers, these little items are often overlooked during a head rebuild.  If yours are worn and need to be replaced, make sure you order the right ones.  Minis used three different versions over the years. In general, the earliest cars used valves with a singl...
Cylinder head - What can easily be achieved
Created: February 03, 2011
The engine build I recently covered in previous Mini Magazine issues developed into a bit of an ongoing 'project'. During a discourse with the editorial staff at Mini Mag, it was decided the build feature presented an ideal opportunity to demonstrate just exactly what such an engine build is capable of in days where it's generally believed you have to have an all-singing, all-dancing 1380cc engine to have an enjoyable road burner - leaving those with very limited budgets a little depressed.
MSE4 - Post 1992 unleaded stage 2 (Road Rocket) large-bore head
Created: October 23, 2000
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
MSE3 - PRE 1992 unleaded Stage 2 (Road Rocket) large-bore head
Created: October 20, 2000
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
CYLINDER HEAD - Valves; shapes, materials, and finishes.
Created: October 19, 2000
Many moons ago, the standard performance valve shape was the then-ubiquitous 'penny-on-a-stick' profile. For the very good and simple reason it minimised airflow obstruction by having the least amount of material in the way. Very plausible, and a design that many have stayed with to this day
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