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I just put in a 4 core radiator in my '66 chevelle replacing my 2 core. My question is how close should the radiator be to the water pump fan? Right now there is about 3/4 inch space.
 
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Long pump or short, big or small block and do you have a shroud? Also are you using a clutch fan?

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Wally
Gold #67
67 Malibu "Small Block"
90 SS454
71 Malibu "Small Block"
93 torch red vette
 

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The clearance sounds good, but I would look into a fan shroud. A shroud will keep you engine running a little cooler.

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Bryan Shook
Burgettstown, Pa.
1972 El Camino
www.geocities.com/motorcity/speedway/6673
Favorite Quote: Some people have shrinks. Some people have their garage.
 

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3/4" and no shroud is good, if you run a shroud the fan blades should be 1/2 way in (or out) of the opening. Putting a shroud on and leaving your fan where it is will be of no benefit. The shroud acts like a funnel allowing the fan to pull air in across a larger area of the radiator.
Philip
 
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