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Mini Cooper Specials
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1.158" (29.4) dia exhaust valve for 12G940 casting.
Our race valves are produced in EN214N steel and rquire 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. Technical Information:
Valve Stem Keepers
Additional Related Articles:
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 single, wide groove in the valve stem. Often called the "normal" valves, the later, pre-A+ valves used a narrow, single groove. The later cars (the change was around the change to A+ time) have a valve stem with three, narrow grooves. Of course, the keepers have to match the valve stem. The only sure way to tell what keepers you need is to take the valves out of the head. Mixing and matching valves and heads is easy to do, so pull the valves and look at the groove before orderingl
Use 2A11 (if you can find them) for early, large grooved valves:
Use 88G459 for the later narrow grooved valves:
Use CAM6975 for the tripple grooved valves:
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