Looking for a vac fitting for a plenum, unsure if they are all the same but this is for the furthest front on a 90-92 unit, if that matters. Or if these are available elsewhere I'd be all ears.

If your looking for the map or fuel pressure fitting use gm 14082470

Thanks for the part number, didn't think it would be available yet but I suppose it was used in many other applications possibly. This is for the fitting in front of the MAP/fuel pressure though, I think the forward most fitting is used for cruise on the 90-92 plenum although I was assuming all three are the same size.

If I recall correctly the hvac fitting is slightly larger od nipple. The 14082470 is still available and has a list price of $6.15.

Went out and looked, how it's in there now is the smaller nipple (FPR) and larger (HVAC/Cruise), with a bolt in the front. It was bought used a long time ago with the bolt already in, so maybe they moved the HVAC/Cruise fitting to the back. Either way, the part number you gave is for smaller so that'll work. Now to find a decent price for it, probably not anywhere to ship due to the price of it.

If you don't have a chevrolet dealer near bye the cheapest bet is on ebay.

http://www.ebay.com/itm/LT1-LT4-Vacu...fe8802&vxp=mtr