Here are a few shots of some radial engines. These are Wright Cyclones from B-17's but generally other models are very similar.
A front view, note the ignition wiring harness has been removed:
Here's a rear view:
Here's a shot from an engine in the plane. Note the black pushrod tubes, the chrome wiring harness cover, and the fabric insulated spark plug wires.:
Finally, here's a shot of the engine peeking out from behind the cowl and spinner of a modified F2G Corsair:
Hope you find these helpful.