Don Terrill’s Speed-Talk

Australian Clevo heads are closed and open chamber with 4 V and 2 V ports. We have found that lowering the exhaust port to obtain a straight outlet, boring the intake runners, inserting ssteel valve stems and using 4 V valves gives a head with capacity to create 600 hp on a good bottom end. Once aga...

Here in Australia, Thermoquads had alloy fuel bowls in 1974 Ford GT Falcons.
Later had thermoplastic.

Hello, I have had 20 years working with Thermoquads.
Rebuilding and modifying for high performance is a simple task.