With a cam lift of 0.309" this cam produces up to 158 BHP at the rear wheels although this figure depends hugely on the cubic capacity of the engine and the quality of the engine build.

To avoid excessive and premature cam lobe wear it is important to use valve springs that provide the correct seat pressure. We recommend standard spring pressure, certainly no more unless you are consistently revving to 7000RPM!

Only just enough spring pressure is required to ensure the valve stays closed when it should be, without valve bounce. Any more is too much and will put unnecessary load on the cam, possibly resulting in premature cam lobe failure.

When choosing valve springs it is also important to check that the extra lift of our performance cams does not result in coil binding on full lift. This should be checked (even with standard cams) with the head and the valve gear assembled and valve clearance correctly set. It should be possible to leaver down the valve by an extra 3mm for safety. Please see the appropriate catalogue section for a range of suitable springs.

New cam followers should always be fitted with a new cam. Order 12 off RTR1298. In addition cam installation lubricant should be used, order RTR5012. See below

Our new camshafts are ground onto chilled iron blanks which have a 5mm deep hard surface before machining. Chilled iron was the material used to produce Triumphs original camshafts and is commonly in use today by market leading camshaft produces. This method ensures the camshaft is hard where required but maintains some flexibility in the core of the camshaft.