Join Date: Sep 2000
Location: Washington, Michigan USA
Forget about any dimension from the fan to the radiator (that's for electric fans); what matters with a stock-type setup is that the fan blades are half-in/half-out at the rear edge of the shroud to create maximum air velocity at idle. Also, make sure your radiator is sealed to the support, and the shroud is sealed to the radiator (sticky-back foam seals available at Lowe's, etc.).
'69 Z28 Fathom Green