So what ARE the cam pulley keyway tolerences on a Miata?

With that type of cam drive system (we learned this playing with 16v VWs), a clever person can adjust not only the overall valvetrain advance but the relative rotational position - overlap - between the intake and exhaust cams.

That's a "racing cam" to you and me, Rusty.

What kind of cam drive does the e36 have?

Kirk

(who knows that there is a Mercedes P/N offset cam pulley key that fits the MkII GTI but hasn't purchased one for his MkIII...