[James]

I have my heat riser valve wired open. I am using a 195° F thermostat. My truck take about 5-6 miles of driving 45 mph to reach the normal (N) mark, at 30-40°F OAT. I have a stock 3 rows radiator. The truck takes 8 gallons of coolant, with that much cooling capacity it takes a while to warm up. On my other 1979 Chevy truck with a V-8 it only hold 4 gallons 1.5 quarts of coolant. It only takes a couple of miles to warm up. My minivan only take 1 mile to warm up. The only non-stock thing I did was to find a air breather (don't know what it originally fit) the fit the Stromberg carburetor with a hot air duct. Made an adapter from a short piece of tail pipe and attached it to the right exhaust manifold with a worm clamp (see picture). Inside the breather there is a thermostatically controlled valve that run on vacuum. It regulate the temperature going into the carburetor.