The Chris Spain header tank

Graeme Oxley let the email group know this tank was back in production, with the maker's description. Details and prices change, so check with the supplier.

Chris Spain's header tank is a custom aluminium tank designed for the Stag. It lies horizontally in the spare space at the front left of the engine bay and holds more reserve coolant above the system level than a standard bottle.

What it does

1. Low coolant warning: an audible alarm if the level drops, which can save an engine.
2. Purges air: coolant comes in at the top and goes out at the bottom, so trapped air is pushed out of the system.
3. Tops up by gravity automatically.
4. Mixes in the antifreeze additive as the coolant flows through.

Fitting notes

• From June 2019 the design changed: the large hose outlet is a male AN10 screw fitting, moved to the end of the tank to leave room for a relocated alternator. The 90 degree hose tail comes in the optional fitting kit.
• The fitting kit is worth having: it has what you need to connect the tank properly.
• Mk1 cars (pressure cap on the radiator) need a 20 lb pressure cap as well.

Watch the installation video on YouTube. The tank is sold through Stag Weber in the UK.

For more on keeping a Stag cool, see Cooling upgrades and Overheating: start here at The Stag Archive in the UK.

Fitted one? Tell us how it went in Tech Q&A.