| Makes you wonder why some aftermarket performance guru hasn't sorted out their own rocker design by now.
After all Martin Brickwood Performance (MBP) of testarossa head fame have gone to the trouble of designing uprated valve guides and collets, it seems only a small step for someone to produce some bullet proof rockers or an improved lubrication system using seperate lines for the rocker oilways (maybe using an electric pump that primes with the ignition switch on, to get oil to the rockers before the engine even turns over) | 
Jools
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