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In my 1971 LeMans L84 conversion, the norm is to run an aluminum radiator with a pair of electric cooling fans. Bollocks.
I find the old school thermostatic clutch fan dead reliable and very simple, looks period correct and confuses "experts". Note to mention it is one less thing to go gunnybags!
I noted on my 2020 5.3 crate motor that the water pump had a threaded section - this intrigued me.
Measurements show it to be a M30-1.5 thread. Why? it served no purpose in installation and as far as I can see no use in rebuilding the pump. By dumb luck I noted in a youtube video that a Ford Ranger had the same thing. The water pump seemed suspiciously centered in the radiator shroud too... this is the pump: GM 12687631
no way the thread and pitch are the same...
Way. I ordered a HD blade section and clutch - it fit perfectly.
I will need to notch the fan blades a bit and shorten the air intake elbow but this is easily doable. Part applications is 1990- 2011 Ranger 4.0 w/ HD cooling:
Blade:
VDO / CONTINENTAL FA70332 {F3TZ8600B, F3TZ8600C, FO3112102} Info
w/ Heavy Duty Cooling
$19.29
DORMAN 620112 {Click Info Button for Alternate/OEM Part Numbers} Info
Automatic trans.; w/Super Duty Cooling
Clutch:
Severe Duty - Thermal SKP SK36720 {6L2Z8A616BA, 6L5Z8A616BA} Info
$33.89
In my 1971 LeMans L84 conversion, the norm is to run an aluminum radiator with a pair of electric cooling fans. Bollocks.
I find the old school thermostatic clutch fan dead reliable and very simple, looks period correct and confuses "experts". Note to mention it is one less thing to go gunnybags!
I noted on my 2020 5.3 crate motor that the water pump had a threaded section - this intrigued me.
Measurements show it to be a M30-1.5 thread. Why? it served no purpose in installation and as far as I can see no use in rebuilding the pump. By dumb luck I noted in a youtube video that a Ford Ranger had the same thing. The water pump seemed suspiciously centered in the radiator shroud too... this is the pump: GM 12687631
no way the thread and pitch are the same...
Way. I ordered a HD blade section and clutch - it fit perfectly.
I will need to notch the fan blades a bit and shorten the air intake elbow but this is easily doable. Part applications is 1990- 2011 Ranger 4.0 w/ HD cooling:
Blade:
VDO / CONTINENTAL FA70332 {F3TZ8600B, F3TZ8600C, FO3112102} Info
w/ Heavy Duty Cooling
$19.29
DORMAN 620112 {Click Info Button for Alternate/OEM Part Numbers} Info
Automatic trans.; w/Super Duty Cooling
Clutch:
Severe Duty - Thermal SKP SK36720 {6L2Z8A616BA, 6L5Z8A616BA} Info
$33.89
I did not know that - getting the Big 3 to agree on anything is the Second Coming...
I clipped the tips a bit to clear the fan after I mounted the radiator and shroud. I ginned up this little widget out of tin
so all the cuts would be the same. I used a pair of bull snips and finished it off with a file and sandpaper.
The 90 degree inlet was trimmed back a 1/2" also and mounted. Clears the fan now by 3/8"
I know this is an older post, but I have also discovered that Dodge uses the same thread size and pitch for their screw on fans. The 02-08 4.7L Rams use a clutch with a longer threaded barrel. If the LS/LT engine is mounted in stock location relative to the transmission bellhousing compared to an older SBC, the Dodge fan clutch will push the fan farther forward, better aligning it with the shroud and giving more clearence for the intake tubing. For the best operation, quiet running and highest airflow, you want 2/3 of the fan blade inside the shroud.
I know this is an older post, but I have also discovered that Dodge uses the same thread size and pitch for their screw on fans. The 02-08 4.7L Rams use a clutch with a longer threaded barrel. If the LS/LT engine is mounted in stock location relative to the transmission bellhousing compared to an older SBC, the Dodge fan clutch will push the fan farther forward, better aligning it with the shroud and giving more clearence for the intake tubing. For the best operation, quiet running and highest airflow, you want 2/3 of the fan blade inside the shroud.
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Mechanical cooling fan setup L84 
SKP SK36720 {6L2Z8A616BA, 6L5Z8A616BA} Info
