The only time I get a chugging type of vapor lock is on a hot day sitting at a stop light. That's due to the real flat fan on an ill-positioned water pump (too low) on my 261 for the '48's radiator. Could it be a water pump problem? I gotta get pre-68's fix.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
