The India-made Iron Barrel engines have valve seats which can handle the unleaded fuel.
Now that this thread has been brought back up.....When I was at Performance Cycle a couple weeks ago getting my new gloves, I asked about octane booster verses mixing straight race fuel. Apparently all the racers, street and dirt, prefer to use the VP Racing Fuel. $60-$100 per 5gal can, but octane ratings are between 95-110. He also showed me an octane booster by PJ1 that said right on the front of the label "Contains Lead Substitute". He said this is what most guys were buying that weren't using race fuel and liked it.Scottie
Was there any lead in the petrol / paraffin / TVO used in all sorts of tractors, before, during and after WW2 ? Many of these machines worked their nuts off, pulling hard and getting hot without their valve seats falling apart - I am in the process of helping a friend to get his pre war Fordson running, so I know a bit about these type of machines as well - the Fordson has compression, even though the head may never have been off - how come? There is no lead in diesel, either and the heat in these engines is much greater than in petrol ones, yet you never hear anything about their valve seats. Our Enfield racers have run many seasons of racing on methanol [no lead] and their valve seats have never been changed and are fine [unlike the big ends, which do need replacing sometimes!]. B.W.