NOS crosflow muffler
 

Found a NOS GM 495854 muffler . Please help ID. I know it's for a firebird, Date code is 12/ 78. I think it's a replacement for a SD?

I looked in 3 GMPD catalogs and could not find it, newest was a 1981 printing. So next are measurements. Are the inlets 2.25 or 2.50? Outlets 2.00 or 2.25? Is it for sale?

I won it in an online auction. I havent picked it up yet. I'll measure the inlets and outlets when I get my hands on it. anything is for sale at the right price.....

Not sure your source or reasoning? Link?

pictures, Box part # is 73-4 SD, inside box appears to be service replacement in 76 Inlet and outlet measure 2.25

with only a six digit part number - that's an older one for sure!

494952 3.701 All F/S.D MUFFLER (repl. 492428) 1 1973 1973 3-56
494952 3.701 All F/455 S.D MUFFLER 1 1974 1974 3-56

Looks like a winner!

Chad

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I will be selling it, any advice on value?

25.00 I'll take it

Parts for sale belong in the classifieds, please post an ad in the appropriate classified forum.

b-man, I posted here to verify it's the correct part and get an idea of value before posting a sale. If I decide to post a sale I will do so in the appropriate classified forum.