[Rick Parker]

I know this is refrenced to FE's however:

I find this challenging when using Webers on a 289 smallblock with dual manifold outlet instead of the normal (manifold contained) provision for a 180 degree thermostat (no provision for bypass). I have a thermostat in the hose before the radiator. It has (2) 3/16 holes. It seems like it takes considerably longer to warm up than before I installed the Webers, previously it had a Holley 650 D/P. My observation is that when it approaches the 180 temp of the thermostat and it begins to open, the indicated water temp drops considerably from the surge of cool water from the radiator and causes the thermostat to close. The engine is VERY slow to get to temp even at road speed and never reaches the previous (with 4 bbl) operating temp. I am using the Fluidyne Shelby spec radiator.