I have looked everywhere I can think of for several days now with no luck, anybody out there know where to get the front and back brackets to mount the compressor to the the block and manifold on a 454? I found the part numbers on an earlier post, but that is all I have found. Here are the part numbers of 1970 454 BB A/C obtained from the 1970 Chevelle Assembly Instructions:

Bracket-RR.: 3969911
Support-RR.: Bracket: 3969912
Support-FRT.: 3969917
Bracket-FRT.: 3969916
Brace: 3969910

www.oldmusclecars.com (http://www.oldmusclecars.com) If anyone has the stuff you need, these guys will. Jason.

Thanks for the tip, they didn't have any for BB, Anybody else out there know where to find these? I tried the local yards. Lots of small block ones, nobody has big block though.

I sold my last set a month ago. Their is a Daytona Show in March Iam keeping an eye out for some. I know you can expect to pay some big $$ for them.

I saw them on e bay a couple of months ago with a buy it now price fo 85 bucks, I don't know if its something thats alway there. Probably off a Pick up if that makes a diffence. Jim

Keep watching ebay - they will show up.

Im looking for some as well, gonna have to keep checking ebay and the local car shows and what not. If I pick up more than one set, I'll let you know.

~Chris

I've been watching and looking and asking everyone I know. Had lots of leads on ebay, but always ended up being for other years and after seeing them they didn't look much like the ones in the diagram I have in my chassis service manual. Found one of them (the big one, 3969917, seems pretty common to find), also got a lead thursday on a set that I'm checking out. If it works out, i'll let you konw. As soon as I tell people 70 chevelle big block, they always seem to laugh. Some have said that a 74 to 78 big block suburban has the same ones, but I have yet to verify that lead. I have now resorted to just asking pick n pull places for the part numbers (see earlier in this post). I sure hope they are the right ones.

Sounds like you want stock brackets, but if not, these guys have a few. I have the 122L - AC for my 69 EC and they fit fine.
http://www.alangrovecomponents.com/B.B.Long_Pump.htm

I don't know if you found the brackets you were looking for but I have 3969917, 3969910, and two others that mount directly to the compressor that I can't find any numbers on. If you need them let me know.

I just found 5-7 sets NOS BB ac brackets like these.
http://i8.ebayimg.com/04/i/06/13/16/e6_1.JPG
I dont know what they are worth I can ask the guy that has them how much he wants for them. The last set of BB brachets I had looked different than the ones above. The ones below were the last set I had for a BB long water pump.
http://img275.imageshack.us/img275/3150/bbacbrackets1rv.jpg
And this was the last set I had for a BB short water pump style below.
http://img286.imageshack.us/img286/3449/acbrackets5ea.jpg