Vacuum leak around intake bolt holes

[Dieselman966]

Has anyone ever checked for manifold vacuum leaks before putting the rocker shafts back on. I was thinking I could use my hand vacuum pump and check for leaks before putting it all back together.

[GerryP]

If you try it, have someone record a video of it and post it up.

[Dieselman966]

I tested for vacuum leaks by torquing the intake down and putting duct tape over the carb opening with the carb gasket and lifting plate bolted down.  I pumped it down to 10" of vacuum.  And it took 1 minute 32 seconds to come down to 9" of vacuum. I cant imagine it getting much better than this.

[67428GT500]

There's no way that would do any better than that considering. It would sound as if you're good to go!