Retarding injectors for a new cam in G4+ Posted November 30, 2019 · Report reply Hi guys, currently running a RV8, fitted with a h404 cam. I can’t find the specs on the cam but understand it has a large overlap. Car has been mapped and is making great power and running well, but it stinks on tickover (no cats). It’s running as lean as poss on tickover, so I can only assume fuel is coming out of the exhaust ports. It’s currently been upped to 340 from 330, but my question is, how much further is OK? I moved to 350 and no issues at idle it would seem, how far can I go? Just trying to minimise the rich fuel smell on tickover, but not sure of the negative effects of having the injectors so close to TDC. Thanks!