It runs and sounds really nice; it’s got a lot more snap now. I had the dual exhaust and 302 heads done before the 4bbl upgrade. I then had the 340 exhaust manifolds installed 6 months after the 4bbl upgrade. Aside from my butt dyno, I can’t say for sure how much power each upgrade provided but the 4bbl upgrade gave me the biggest butt dyno improvement.
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