brake booster nipple question

[ltlfrari]

I have a 95 3.4 DOHC from an olds cutlass supreme that is going int oa Fiero. Anyone know what thread size the adapter is that goes into the plenum (center rear) that the brake booster vacuum line goes onto?

Dia seems to be 5/8 inch but I cannot find what thread it is. I want to change it to something that has a 3/8 nipple so that it match the Fiero's line.

Thanks

Dave E

http://www.ltlfrari.com

[brian89gp]

You might try a 3/8" NPT fitting (as in 3/8" pipe thread). They look about the same size. Places like Lowes would probably have a 3/8 NPT to 3/8 barb.

[quantum110]

Not only that but places like lowes, home depot, ace...also have a thread guide...basicly a long string of threaded objects (female one side male on the other) to tell you the exact thread.