22-11-2018, 03:43 PM
I've never had a problem with the 37 head. My blown car runs a 37 head (with a lowered CR) and doesn't oil plugs despite having two stroke in the fuel. That said I do have a nice fat spark created by a properly rebuilt ML magneto - the higher you rev, the bigger the spark.(which tends to be the other way round with new fangled coil systems)