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my current sr is fully stock, only got ras on the top end. ive banged 8500 for 4-8 seconds on the rev limit and several times each race. i also run 21 psi. on a 3071. i put 1200 track km on it last year and i ran it hard with no problems.
honestly, my last sr setup didnt last a day of daily driving abuse without 3 rocker arms breaking and valve chunks chewed up my cams. stock valvetrain or not, every sr i run will have ras installed.
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