what makes this 71 only application..

http://cgi.ebay.com/ebaymotors/NOS-MOPAR...sQ5fAccessories

Dunno, but if need 72 and later I have a NOS assembly still on box BUT with one piece missed, the big spring like an arch shaped

how about this kit...

http://cgi.ebay.com/ebaymotors/NOS-MoPar...sQ5fAccessories

thats the same vendor I PM you last night, but on his ebay sales instead the yahoo store. I'm searching the kit I have to show you

here is the apparently diff between both kits ( earliers and laters



legend on pics

NOS MoPar 1968-70 340 Exhaust Manifold HeatRiser Package

This is an NOS MoPar exhaust manifold heat riser repair package that fits 1968 - 1970 340 models only with manifold casting #2863549. Part number is 3004574.

This includes all the correct parts including the 2-1/4" diameter valve. Don't be mislead by cheap "one-size-fits-all" 318 kits that other companies will try to sell you. This is the real deal with instructions. This package fits 1968-70 340 only! For use only on manifolds with casting number 2863549. This is the only correct package for these unique hi-flow manifolds.

1971-93 318/360 kit, part number 3683947. Most of the components including the crucial ones are different. The early 340 hi-flow manifold uses a 2-1/4" diameter valve while the later 318/360 manifold uses a smaller 1-7/8" diameter valve.

found an old pic I have took long time ago of the kit I have ( attachment ). Is the one I can sell cheap.

and confirmed the PN on it is the lates one 3683947

missed the spring what looks like an arch. You can compare kits on pic and note whats the one missed... note with this pic: