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I will have to try your method of adjusting that accel pump arm.

I do have the hollow screw and run a pink cam. I always though the 42 seemed big... but it seemed to be what it wanted....

What else could be wrong that the large pump shot might be compensating for? I had the carb jetted on the dyno with wideband O2 sensors so I am pretty sure the jetting is right...

Any ideas?

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Did the dyno have your exhaust system hooked up? Did you dyno tune it with teh air cleaner on and hot air from the radiator blowing over the carb air cleaners? If not you may need to retune it in the car I get my motors close on the tune up on the the dyno wideban and then finish the tune up in the car, with or without my dual wideban hooked up, the butt dyno can be fairly accurate in the car