I Thought I Read Somewhere They Were Recommended For This Power Level So Thats Why I Have Bought Them,i Would Rather Do Them Now Than After I Blow A Gasket.got My Alloy Pulley And The Headbolts Arrived Today,after I Paid Gordon Brown £13.22 In Vat Since They Come In From America.i Hate This Country Sometimes,taxed When You Earn,taxed When You Spend.thay Must Make A Fortune Off Of Joe Public Spending Their Hard Earned On Things That Make Them More Content In Life.i Hate The Thought Of My Money Going To Pay For Thieving Junkies To Get Methadone And Prams For Their Soon To Be Junkie Kids,or Fighting Unwinnable Wars.rant Over.