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Chirpy Exhaust Note

During about the first 5 - 10 minutes of warm up, I have high piched chirping sounds coming from the right side exhaust pipe. I tried to listen & feel around close to the header/engine area too, but couldn't detect anything there...got hot quick!

But listening at end of the exhaust pipe, it is pretty loud there coming out of the exhaust. The engine runs rough anyway until warm up, as I have to play the peddal, so there is lots of thumping on warm up which is probably normal, but the chirping doesn't sound right. Any ideas?

Althougth I don't hear it in the header/engine area, maybe it is the mate of the headers to the engine gasket area and I just hear it out of the end exhaust. If I was to attempt to tighten the headers, anyone know the torque specs for headers to an A-3 aluminum head?

Here are the engine specs if that may help with anyting:

383, Ported and Polished SVO A-3 Aluminum Heads, 10.5 to 1 Compression, Crane Roller Rockers, 3.75" Stroker Crank, Solid Lifter Competition Cam, Crower 3/8" Push Rods, Stainless Steel Valves, Child & Alberts 6" Rods and Venolia Pistons. And photo: http://image05.webshots.com/5/2/50/24/66525024wUppzb_fs.jpg
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