The E303 cam is known for very low vacuum(In my neck of the woods)One of my friends has a kenne bell setup theirfore has a boost/vacuum gauge.According to the gauge he was running about 8 inches of vacuum at idle(not enough to run even a new brake booster.The problem was readly solved by changing cams.He put back in his stock one and the problem was solved.Ihave an F303 in my car and it operates very smoothly and has less idle lope than the E303 It also makes more power.
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speed is money.How fast you want to go?
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