cylinder heads · FF-0304

What do the valves and chamber look like on the underside of an ARDUN head?

The chamber is very much half a sphere. The exhaust valves are smaller than the intake valves, and the spark plug sits by the edge of the exhaust valve, close to the middle. Steve explains that with the valves laid over, flow from the port into the cylinder, or out for the exhaust, is nearly a straight shot, so the head breathes very well. That layout is also why the exhaust rocker arms are so long.

Expert

Steve Coppock

Evidence

expert attributed

Component

chamber, valves and spark plug

Applicable scope

Steve Coppock's Ford Flathead V8 with Don Ferguson reproduction ARDUN heads