4x leakdown test's all spot on. My car spent 1 hour being run in at various rpm inc a couple of runs to 9k. Advised by my engine builder Jimmy Skyers X Mclaren. Is he wrong? I hope not! Same with my bike engine's over many years & 6years of that racing {so they didnt have an easy life} None of them ever seen more than a couple of hours running in. Ive never had an engine fail on me YET {that Ive had built} fingers crossed. Not sure about the guy's on here & how many engine's they have had built the Evo must be getting on for my 10th/12th engine build now. I dont build engines for a living i just pick the best engine builder. Simon you map cars & Jimmy builds them I'm sure he would not have given me the wrong info As said above different builder's Will have different views on running in. My above builds had mineral oil in for a short period 1st followed by whatever oil i was using at the time. This is not a rant or a dig at anyone it's just my past experience.
PS if anyone is about the RYE area today pop in to JRM see my car fall off the RR again {not}
NIGE