Clutch Fan
I would imagine theres going to be a lot of differences depending on stock copper/brass or thicker aluminum radiator. Elephant ears, stock BB mounts, MP spool mount K, homemade mounts, etc.
Not working with a big block myself, but i went with an engineered cooling products aluminum radiator, and a Hayden clutch fan for a 1990 Jag XJ6 with an 18" 6 blade flexalite fan only gave me 3/4" clearance to the back of the radiator. I am using a spool mount K with soft polyurethane bushings so fore and aft movement from acceleration and deceleration will be minimum.
I was going to go with an elect fan originally but wanted a puller so it couldent be seen behind the grille. The thinnest 18" single would have hit the water pump flange, and 2 smaller dual fans i was afraid wouldent have the CFM i needed.
Any way you go, a proper shroud to duct things is a must. I made mine out of fiberglass, and resin with a homemade wooden/masonite buck and an old cotton T shirt. Maybe this idea will help some of you out. Blades for mechanical fan should be about half out of the shroud, and have at minimum 1/2" clearance between them and the shroud.
I would imagine theres going to be a lot of differences depending on stock copper/brass or thicker aluminum radiator. Elephant ears, stock BB mounts, MP spool mount K, homemade mounts, etc.
Not working with a big block myself, but i went with an engineered cooling products aluminum radiator, and a Hayden clutch fan for a 1990 Jag XJ6 with an 18" 6 blade flexalite fan only gave me 3/4" clearance to the back of the radiator. I am using a spool mount K with soft polyurethane bushings so fore and aft movement from acceleration and deceleration will be minimum.
I was going to go with an elect fan originally but wanted a puller so it couldent be seen behind the grille. The thinnest 18" single would have hit the water pump flange, and 2 smaller dual fans i was afraid wouldent have the CFM i needed.
Any way you go, a proper shroud to duct things is a must. I made mine out of fiberglass, and resin with a homemade wooden/masonite buck and an old cotton T shirt. Maybe this idea will help some of you out. Blades for mechanical fan should be about half out of the shroud, and have at minimum 1/2" clearance between them and the shroud.
