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Old 02-17-2002, 07:14 AM
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you can run breathers on both valve covers, we did that in the pre-emission era, but it is not nearly as good as a pcv system, the pcv uses engine vacuum to not only prevent crankcase blow-by pressure's but also to draw fresh air into the motor trough the breather on the other cover,it also keeps your motor much cleaner. The pcv is also a controlled vacuum leak, if you add one to your system you may need to re-jet your carb to keep your engine from running lean
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