Ok-I rebuilt the /6 version of the BBD carb that I had and it runs ok, but has no vacuum at the distributor port. I ran this carb for several years until I put the rebuilt head on last year and I know it had vacuum at that port. In following the directions from within the BBD manual, it says that the slant 6 version of the carb uses the base gasket w/o the cutouts on the side (only the 318 version uses that base gasket). This is the only change that I made in the parts used when rebuilding this today. I've had been using the thicker base gasket w the cutouts on the sides. This is on a '78 D100 w/o the EGR system-which gasket should I be using? (thick or thin and w or w/o cutout) Thanks-Mike

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Good gun control is hitting your target repeatedly

get the vacuum gauge on the no-vacuum port and rev the engine slowly, you will see a peak at certain throttle position and falls off as throttle opens more wider, that's the one you want for the distributor vacuum. Don't mistake this for EGR port.

Cheers, Wizard

Thick, with cutouts. Also, the gasket between the throttle body and main body needs to have all the correct cutouts and holes. The EGR hose nipple has a necked-down end; the distributor vacuum nipple is just a regular normal little metal pipe.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.