Classic accel pump issue and easy fix without taking the carb off the engine. Either stuck, out of adjustment, or just dried out and hard. Just uses a little umbrella shaped seal with a spring inside.
15 minute fix.
You can easily check just but looking down into the carb when moving the throttle. It should squirt raw gas like a little water-pistol.
Quadrajets were good carbs with proper tuning.
One other issue that is sometimes found on 1970 small-blocks when it comes to poor throttle response is the lack of manifold heat. Sometimes the factory put little tin block-off plates in the runners that go under the carb for emissions purposes. This made poor throttle response until completely warmed up - but once hot - the engine would work fine.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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