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Excellent … “you’ll never be late if it’s a V8” …
I think you meant 4.5 Imperial gallons, rather than quarts, ie. ~20 litres. The Ford flathead engine is the quickest way I know of boiling four gallons of water so internal cleanliness is important – use a commercial chemical scourer when the engine is running – heat is required for a good clean-out. Then add a surfactant like Water-Wetter to reduce the surface tension to the block internals.
Unadulterated plain water is by far the best coolant (with a surfactant). However, if you are not going to over-winter your car in a heated garage or drain it and lay it up, then anitifreeze is essential, 35% minimum, but the type of antifreeze is important.
At risk of teaching granny to suck eggs, and for the avoidance of doubt I offer the following descriptions:
Most commercial antifreeze formulations include a glycol (to suppress the freezing point and raise the boiling point), corrosion inhibiting compounds and a coloured dye (commonly orange, green, red, or blue fluorescent) to aid in identification. A 1:1 dilution with water is usually used, resulting in a freezing point in the range of minus 37 °C to minus 42 °C, depending on the formulation. There are two basic types of antifreeze available today dependent on the corrosion inhibitors used:
Inorganic Additive Technology
This is the traditional coolant based on inorganic additives and is called inorganic additive technology (IAT). It is a tried and proven chemistry that provides a fast acting protective film. The additives deplete and the coolant needs to be drained and replenished every couple of years. This type can be used on all mixed metal engines with components including steel, cast iron, copper, brass, aluminium and solder without any detrimental effect.
Organic Additive Technology (neutralised acids)
The newer OAT coolants work differently than the older silicate based IAT coolants. Aluminium and ferrous metals form a surface-layer of corrosion in the presence of moisture, even with the little bit of moisture in the air. OAT coolants prevent this metal-oxide layer that protects the surface against this corrosion. Inherent with their design, the OAT coolants last longer than the older traditional IAT coolants.
This category of antifreeze cannot be used in systems containing yellow metals.
Difficult to tell from your photo, but the engine number is at the front of the block on a boss by the #2 cylinder, ie. on the right of the block looking forward.
I hope this leads you to it.
There will be ten digitsl: the first two are the year of manufacture, the second two are the model of the car it was originally fitted to, and then a six digit serial number.
The engine number is stamped on a boss on the front of the block, just by the right cylinder head.
Thanks for that Roger.
Are you able to say what the taper angle is, please?