Join Date: Jan 2004
Location: WPB Florida, formerly Toronto Ontario
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I wouldn't do it yourself if you aren't comfortable under the hood of your car. It is a VERY precise andjustment. It needs to be between 10 and 12 thou (or 10-12 thousandths or an inch). You also need to make sure that you secure the adjustment back properly. If you go less than that, you will break your rockers. If you go looser, they will have the well known m20 "ticking" sound.
The pic below is when I broke a rocker arm on my old m20 engine. Not a fun job to replace rockers!
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1987 325is body
1995 325 motor
Performance upgrades: Genie headers, BMP cams, full custom exhaust (dual 2 1/4", mandrel bent, stainless), K&N filter
Other upgrades: Sony deck, Sony 10-disc changer, sony 6x9's, high end alarm (keyless entry, motion sensors, logic sensor, etc.)