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74 620 Stock Exhaust System Pipe Sizes

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MrCreosote View Drop Down

Joined: 25 Aug 2021
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    Posted: 25 Aug 2021 at 12:11am
Need to know the stock exhaust system pipe diameters for my stock 1974 L18 620 so I can get my stainless system built. I don't want to make any modifications and want the new system same as original equipment stock.

I thought the entire system was 1.5" but it's looking like the exhaust to muffler clamp called out in carpartsmanual (20643-B5000) is 45mm or 1.75 inches.

The tailpipe diameter is more difficult because it came with the muffler - no clamp. There was a mickey mouse hanger clamp at the end of the tailpipe (20641-B5000) but I can't find what diameter it was.
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