Back in '72,..Cleavite "Micro" was the bearings to run in my area & I ran them in a fast limited street/ some 1/4 mi action 7500 rpm race hemi (68 S/S type tune) for a while with no Noticable abnormal wear (bearings or crank) main & rods & engine ran great ..I only knew enough to follow the gang.... Getting same engine slightly cam detuned for another go at it & wondering if the "M" is ok or is some fundamentally Wrong for Street/Strip & a H or P only preferred ?
