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<blockquote data-quote="drivermod" data-source="post: 592649" data-attributes="member: 4658"><p>I know I had the 6" serpentine pulley on my pump but I cannot remember the size of my crank pulley. I think it was 7.5". This was on a SBC with the rev limit set at 6500. No issues. I didn't have the keeper welded in that pump. On Todds supercharged 3.8 (Silencer buggy) he was running the 4.2" serpentine pulley with a stock 7" crank pulley (6200 rpm rev limit). Almost double the recommended max rpm. He did pop the keeper early on (now I know why) but tig welded it on and never had another issue. Ran that way for 3 years without a problem out of the pump. His buggy gets beat down a lot too. I think their rpm limit is designed for long periods of continuous use like in a round track racing situation. I would have no concerns running a 7.5" crank pulley with a 6.5" pump pulley based on past experience.</p></blockquote><p></p>
[QUOTE="drivermod, post: 592649, member: 4658"] I know I had the 6" serpentine pulley on my pump but I cannot remember the size of my crank pulley. I think it was 7.5". This was on a SBC with the rev limit set at 6500. No issues. I didn't have the keeper welded in that pump. On Todds supercharged 3.8 (Silencer buggy) he was running the 4.2" serpentine pulley with a stock 7" crank pulley (6200 rpm rev limit). Almost double the recommended max rpm. He did pop the keeper early on (now I know why) but tig welded it on and never had another issue. Ran that way for 3 years without a problem out of the pump. His buggy gets beat down a lot too. I think their rpm limit is designed for long periods of continuous use like in a round track racing situation. I would have no concerns running a 7.5" crank pulley with a 6.5" pump pulley based on past experience. [/QUOTE]
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