C2 Heat riser question

[Hector G.]

Which one of these two 2 1/2 heat riser valves is closer to factory configuration for 67 BB?
DSC08458.jpgDSC08459.jpgDSC08452.jpgDSC08457.jpg DSC08448.jpg
The unused valve came out of the GM box.
Thanks for your help.

[Gene M.]

Re: C2 Heat riser question

Hector,
Just going by memory and not going out to garage to look the one on the left in the first picture looks like a big 2 1/2" manifold outlet small block valve.

[Stephen L.]

Re: C2 Heat riser question

Hector, The valve counterweight shaft should face forward with the weight facing the engine. The "flat" side of the valve mates with the manifold. The correct part is #3887034. Your new one is correct for BB and HP 327 engines. Don't know what the used one is for.......

[Hector G.]

Re: C2 Heat riser question

Thanks Gene and Stephen.