[twobjshelbys]

I've got an air bubble.

The radiator hose dives from the thermostat housing to the radiator with an in-line cap. This means that when I fill it (not really) there will be an air bubble. It is pretty evident too - the engine starts off and gets to thermostat temp (160-~80C whicn is the gauges) and then will shoot to 100+C. Then it drops like a rock (in 10's of seconds) back to normal.

I think the solution is an expansion tank. If I can get the reservoirs and cap above the pump I'll be OK. I've seen lots of hand constructed ones but the right one is some I've seen that attach at the thermostat coupling point. The problem is the one's I've found all exit to the right (passenger) side. I need one that exits to the left (driver) side to get to the top of the radiator. I also need to preserve the thermostat/water pump bypass hose (a requirement from Roush advise. Oops, I said it was a requirement).

The engine is a Roush 427IR which starts life as a Dart 351 Windsor.

Of course, it has to fit under a Cobra hood.

Any suggestions?