Learning to Tune the Holley Sniper

[weendoggy]

Dave,
Looking at your collector setup, please tell me those tack welds aren't the only thing making the system tight. You can have a LOT of air sneaking in through that collector seam(s) to cause the fresh air intake on the exhaust vacuum pull. That collector seam should be welded 360°. I know it sounds lame, but you have to take care of basics first. Looking at your logs I tend to agree with Bob on results.