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Dwell Angle is 30 - 40 deg, timing at idle with vacuum 8-12 deg BTDC, at idle wihout vacuum TDC, at 1500 RPM without vacuum 15-19 deg BTDC, and 3000 rpm withou vac 30 deg BTDC, Vac should be removed from the distributor and plugged. Plug gaps are 0.8 mm (20 thou). No 1 cylinder for your timing light is the first on the left bank, idel speed is 700-800 RPM. I have just replaced the right hand bank plugs, and just that has made my 350SL much sweeter, but they are a sod to get to, and removing the plug caps was a real chore. If you do buy new plugs mine requiiered the type with the screwed top removed, so be careful what you buy. Good luck, I have all of this to look forward to. Info is from the American Haynes manual (350 & 450 1971thru 1980). Your car should have contact breaker points, for which a gap is not given, so its whatever gap you need to get the dwell angle.
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