I have a 302 with a stock metal 4 blade fan that is about 1" from the 3 core radiator,the fan is also buried in the shroud. At idle, it only pulls air through the coils directly in front of it's footprint . If the fan is too far inside of the shroud, it won’t pull as much air through the shroud as it could. Looking from the side of the engine, the fan blades should be half in and half out of the shroud. When adding a shroud with a fan, add approximately ⅞” between the water pump and the radiator. The fan shroud should only enclose 1/2 the fan blade. Thanks … Running two electric fans allows for more space next to the water pump, with or without a shroud. I tried a six blade fan, but it was worse. There should be at least 1 inch of clearance between the two. You could put a fan spacer to stick the fan a little more forward so your shroud doesn't have to stick back so far. An aftermarket fan and non-thermal clutch is much lighter than the factory thermal clutch and fan so you should be able to use a reasonable spacer to move the fan into the shroud some. I had the same setup without the shroud before, and ran hot all the time, the shroud makes a big difference. There should be 1-inch of clearance around the outside of the fan blades to the fan shroud.The last measurement you should check is the distance from the face of the fan to the radiator. I'm not talking about fans that might sit 1" away from a radiator with a shroud mind you. It's getting to about 240. I also have a 3/4" restrictor in the thermostat housing. I happened to meet an aeronautical engineer at a local cruise in and he explained that 1/3 of the fan's air flow comes off the tips in a vortex. I think I'd like it to be a little closer, but it is doing the job. Cores larger than 24″ in length can use two fans (12″, 13″ or 14″) depending on size of core. I think the shroud clears the fan blade by maybe 1/2" all the way around. If you completely cover the tips, the air is trapped, forced back in and counter-acts the air flow. Looking from the side of the engine, the fan blades should be half in and half out of the shroud. If you have a fan shroud, the position of the fan blades in the shroud is very important to maximize airflow. I seem to remember reading someplace that the fan should protude some amount out of the back of the shroud,in order for the cooling system to get the optimum use for haveing a shroud.Can anyone help me with the proper location and spacing on the fan ? If you have a fan shroud, the position of the fan blades in the shroud is very important to maximize airflow. Hope this gives you some ideas. I'm talking about the one's like your SPAL fan, because I have the 3000 SPAL on my LS1 radiator as well. If the fan is too far inside of the shroud, it won’t pull as much air through the shroud as it could. 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