Look HM Elliott & Co`s site . Most of the NASCAR teams in Mooresville , NC use his coatings on all their engine bearings , valve springs , ring gears ,
oil shedding coatings on the inside of the pumpkins etc . John Force is also a customer . I`ve known Harold for years and used his coatings for years . BTW , he used to build engines for Junior Johnson and later , the Penske teams . I believe at one time he was NASCAR engine builder of the year . I used his coatings on all my bearings when I was racing and they looked brand new after as many as 15 races with
oil temps in the 230 degree range .
The crank counterweights can be coated with an
oil shedding coating .... saves hp when you don`t have to sling around all that oil . The bearing coatings can save an engine if the oil film breaks down .
Harold told me that the rear end coatings were worth about 15 hp and cooler temps . I had ERA ship him my gears before they assembled the rear end . They also coat the yoke splines ( mine also ) ... no hp gain , just peace of mind on a highly stressed part .
I can`t quote tests etc . , but they must work otherwise the teams wouldn`t use them .
On my 427 Galaxie , I had him coat the ring gear and pinion , piston skirts , all bearings , valve springs etc . Again , I didn`t run any tests , but I now have right at 10 years on that engine .