It is probably the mechanical secondaries. I'm not an expert but I do know a little. I always like the Holely better anyway though. I assume you tuned the cab when you put it on. If its new you still ahve to tune it a little. I dont care what they say about " Just put it on and go." Bull Malarky. you gotta fine tune it a little.
Brad
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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