Purchased aluminum roller rocker arms from procomp motosports they sat on the shelf for a while then i assembled the engine and used these rockers they lasted less than 600 miles and began to crack around the roller 10 out of 16 cracked, thank god i caught this before it destroyed the engine. Im not a back yard mechanic, i was an automotive machinist for 40 years served an apprenticeship with state of california metal trades assn. There was no misuse of parts just faulty parts, i sent the parts back to pro comp these parts are supposed to be life time warrnty or close to it, i sent these parts at my expense, they told me they would not warnty these parts because i didnt keep my reciept, i buy hundreds of dollars of parts every month so i dont keep tract of them. But these parts are like brand new, i still have 1 cracked one and 6 that havent cracked yet. If any body wants to know about this company, and do they stand behind their parts, thats a big NO. If it costs you another 80 bucks for a set of rockers pay it, thank god i learned a cheap lesson. Cheap parts aint good, and good parts aint cheap. G
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