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You can take it up to and past 6k if you wanted to, but you won't be making power and you'll be wearing down your motor fast. Your motor will run out of spunk somewhere around 5600-5800 probably. Something else is probably holding you up. Shouldn't be throbbing as far as I know, but I don't have any experiences with BW35s over 45 mph, so I don't know exactly HOW much power they sap. My car was happy running 80mph at 4300rpm for an hour at a time many times... FWIW.
And I've heard of people running up to 7k on their B20Es that are stock, definitely not the best for the engines, but they've done it on their DD engines.
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Kyle - '68 142? - Oregon Volvo Tuners?
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