To put an air of conclusion to this, I intend to retrofit all my trucks with chadkiser's 70 Gremlin spring. They all percolate to one degree or another. Spring, summer, fall, summer gas, winter gas, they all do it. I'm ready to believe that some small amount of the heat riser spring not opening all the way has no effect for the vast geographic expanse of the USA at lower elevations, but I need all the cooling of my fuel that I can get. Thanks to all of you for your help! Dave
1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup
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