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"The 440 performer is much better than a CH4"
Timing, dead spark plug, and you ran it out on the dyno?

packages take out the guess work. Use them.

The CH4 intake is a great intake with a AVS carb, mild cam 440 2.76-3.23 gears.

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With the Performer I have to run a 2" air filter(opposed to a 2.5") to clear the Air Grabber box. People told me there wasn't a lower intake so its good news for me about the CH4B and Weiand 8009. Maybe that extra breathing room with the proper filter will make up for any possible lost power with the lower rise intakes.

The car's running 3.55's, and I might bump it up to 3.73.

And...I didn't know the plug was dead on the dyno run. Another mechanic afterward said he noticed it had an intermittant miss and showed me the plug which the ceramic could spin in the casing. Like someone else said, maybe they couldn't hear it do to the rough idle.