Removed the heat riser from my 64 L76, 2 1/2 inch exhaust (replacing the exhaust system). Cleaned the heat riser. Need help in identifying it - determining if it is original, service replacement or after market. Car was "restored" - including engine removal and rebuild by previous owner.
AIM says the PN for this "exhaust valve" is 3767651. I cannot find any references for that number, including a search of old threads in this forum. Most references state the PN is 3887034, which is applicable to a number of SB & BB engines.
The counter weight on my heat riser has a number, 90019 cast into it on the side.
At least two somewhat obscure vendors (not the usual suspects) list this heat riser, with 90019 to be correct for a 64.
I have attached 2 pics - copied from a website but my heat riser is identical to this one - especially the butter fly which has an impression that runs vertical to the cross shaft - no others that I have seen on any vendor sites have this impression.
One last thing, when my heat riser is on the manifold, the counter weight hits the starter / solenoid heat shield when it is full open. The heat shield does not interfere with the operation of the counter weight - they just touch when fully open.
All that said, can anyone shed light on whether my heat riser is an original, if not what is the correct PN for an original and, can you recommend a source for a good repro.
BTW - I am sure I am installing the heat riser correctly; passenger side, counterweight towards the back, closer to the fire wall, with the beveled edge for the donut on the bottom - it really can only go on one way.
Thanks to all
AIM says the PN for this "exhaust valve" is 3767651. I cannot find any references for that number, including a search of old threads in this forum. Most references state the PN is 3887034, which is applicable to a number of SB & BB engines.
The counter weight on my heat riser has a number, 90019 cast into it on the side.
At least two somewhat obscure vendors (not the usual suspects) list this heat riser, with 90019 to be correct for a 64.
I have attached 2 pics - copied from a website but my heat riser is identical to this one - especially the butter fly which has an impression that runs vertical to the cross shaft - no others that I have seen on any vendor sites have this impression.
One last thing, when my heat riser is on the manifold, the counter weight hits the starter / solenoid heat shield when it is full open. The heat shield does not interfere with the operation of the counter weight - they just touch when fully open.
All that said, can anyone shed light on whether my heat riser is an original, if not what is the correct PN for an original and, can you recommend a source for a good repro.
BTW - I am sure I am installing the heat riser correctly; passenger side, counterweight towards the back, closer to the fire wall, with the beveled edge for the donut on the bottom - it really can only go on one way.
Thanks to all
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