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Originally Posted by FlatheadTed
GM promotes this product ,no disrespect meant but I think ,they need rethinking
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How do you know if you never used them??? The test information provided is from an unreliable source who bad mouthed Shewmans stats before he ever saw one. I doubt if he tried them he followed instructions on how to install them. The chart looks phony to me. I KNOW the Stant stats he promotes cause the engine to run at elevated temperatures in 90 degree outside temperatures. I have probably the coolest running stock radiator flathead that exists. A 39 P/U stock radiator, Skips hi flow pumps, 6 blade industrial fan, 4 lb pressure cap and a shroud. This truck was run in the flea market at a EFV8 meet on a day over 100 degrees at a fast idle for over 2 hours and never got over 180 degrees with no stats. When raced a little the temperature came down. I went to lunch and left Ken ct watch it for me. This was run with no stats. Later that summer driving the truck it was running at 165 so I tried the same Stant stat with and without holes in the flange to help increase the flow caused by the small flow opening. The 6 or 8 3/16" holes in the flange helped cool a little better but caused the truck to run above 190+ on the road at driving speeds and hotter in traffic.
The truck now has Shewmans 180 stats in it and runs at 178 to 182 at all times. I have his stats in several other 30's Fords and they all run very close to 180 in hot summer. I only tested them in temperature above 45 or 50 degrees and they ran in the 170 range. My testing is uniform under the same conditions most of the time. The best most accurate testing is done with the car in a stationary position with a large house type fan against the grill at an engine speed in the 25 MPH range. I find that the temperatures I get in this type of test are exactly what I get on the open road. Idle and traffic temperatures on stock radiators varies greatly because of the poor fans on most of these cars. I use and promote Shewman's stats because they are the only ones I know of that don't restrict the flow of coolant. G.M.