Originally Posted by deadhorse

your dwell is controlled by your point gap--on ford cars you set the points and it -is the dwell-- on chevy theres a little window on the distribtor -- you use a allen wrench and set the dwell -that also sets the points - dwell and point gap is the samo samo-- you can't change the dwell without changing the point gap-- -- set your timing -loosen distributor [just loosen don't remove bolt]- disconnect the vac line from the carburetor-- plug it [the line]-- set timing -leave timing light attached- reattach the vac line -- raise rpms --watch timing marks to see if timing advances with rpms--tighten distribtor back down