marc_w Posted November 12, 2003 Report Share Posted November 12, 2003 I thought long-tube headers produce power throughout the RPM range? I know a ton of guys running the TOG headers in their Avalanches, and I never heard of a single one failing emissions. It was my understanding that headers actually help produce BETTER emissions. The F-body guys are getting away with cams in the 220/220 ~.550/.550 114LSA, in CA. I'm not sure how much bigger you'd want to go in a heavy truck. Link to comment Share on other sites More sharing options...
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