06-09-2020, 10:38 AM
Tony is right in what he says. For a quick Austin 7 two things matter. Gearing and breathing. But, you have to consider them as a package. It’s no good having big valves if you are breathing through a 12mm carburettor choke. It’s no good having good breathing if the gearing means you can’t get it on the cam. The thing that’s not been mentioned is the importance of the exhaust manifold. If the cylinders can’t get rid of the burnt gases they can’t breathe in fresh. A standard manifold simply will not do.
Alan Fairless