Part number for exhaust shutters?

nola mike

nola mike

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When I put the engine in 5 years ago (it was an '89 4.3L, no s/n available) I couldn't find the right exhaust shutters. P/N comes up as 807166A3. I got a few different sets, none of them fit right. Ended up modifying the outer ring (they were too big). Worked OK, but now that the engine's out again I'd like to find the right set. Ordered another 807166A3, still too big. It's a 2 piece manifold, the wye pipe is 4" x 2.75". It's of the offset pin hole type, and the pipe is symmetrical/oval. Are there other shutters out there that I'm not finding?
 
Fun Times

Fun Times

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nola mike said:
When I put the engine in 5 years ago (it was an '89 4.3L, no s/n available) I couldn't find the right exhaust shutters. P/N comes up as 807166A3. I got a few different sets, none of them fit right. Ended up modifying the outer ring (they were too big). Worked OK, but now that the engine's out again I'd like to find the right set. Ordered another 807166A3, still too big. It's a 2 piece manifold, the wye pipe is 4" x 2.75". It's of the offset pin hole type, and the pipe is symmetrical/oval. Are there other shutters out there that I'm not finding?
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The following website offers a good breakdown of what shutters work best where, etc.. See if it may help in your situation too.

 
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