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Username Post: will I need electric fans for a 383        (Topic#365598)
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
06-23-21 11:52 AM - Post#2822010    

Okay I've finally decided I want a 383 stroker from blueprint. Will I have to install electric fans ? have any of you been able to use the stock fan with a 383 ?



 


dcairns 
Frequent Contributor
Posts: 2234
dcairns
Loc: Orange CA
Reg: 11-07-03
06-23-21 12:59 PM - Post#2822015    
    In response to Adam63impala

While I did go the somewhat unorthodox direction of keeping my 383 looking like a stock 327-300, here is my experience:


I have the stock 5 blade fan and clutch with shroud on the 327/300 radiator (same radiator as the 409) also have a stock water pump rebuilt for higher flow. I have a factory A/C car. Engine has a mild cam, 370hp 420tq and the Carter AFB used on the 409 (hard to tell from the one used on the 327-300). In hot weather stuck in traffic, the temps go up till I have to turn off the A/C and either shut down or get things moving to cool down.

I have added an electric fan inside the shroud up close to the radiator where it should help more and not be seen. It helps some.

I still have not exhausted the potential for timing and idle fuel mixture. I have tried leaning out the idle fuel mixture a bit and it helped some.

So that is my experience so far.



- Dave
1964 Impala 4-door sedan



Edited by dcairns on 06-23-21 01:01 PM. Reason for edit: No reason given.

 
japete92 
"7th Year" Silver Supporting Member
Posts: 1677
japete92
Loc: No. Virginia
Reg: 01-18-13
06-23-21 01:09 PM - Post#2822018    
    In response to Adam63impala

  • Adam63impala Said:
Okay I've finally decided I want a 383 stroker from blueprint. Will I have to install electric fans ? have any of you been able to use the stock fan with a 383 ?



Have to? Absolutely Not.

Duplicate what GM did with the 409 (or any of their 300hp + engines) and you will be fine.

I have a 383 my 63 Impala, it stays at the proper temperatures with the 5 blade asymmetrical fan, the proper shroud/installation, the '409' radiator, 180F thermostat, and a clutched fan. All basically 'stock' parts.

The clutched fan does NOT increase cooling. It de-clutches the fan when cooling is not necessary to allow the torque (to rotate the fan)
to be applied elsewhere (propulsion).

One could eliminate the fan clutch and try keeping it cool with the OEM 4 blade, but a 6 blade would likely be needed for long periods of running at idle/sitting in traffic.

Cruising along at forward speed (25 mph, or so), the engine will stay cool via the natural air flow thru the radiator. The fan is superfluous in that mode.

Pete






 
ayelander 
"3rd Year" Platinum Supporting Member
Posts: 130
ayelander
Loc: Oak Island NC
Reg: 12-07-18
06-23-21 06:05 PM - Post#2822029    
    In response to Adam63impala

Depends on how much HP that 383 will develope.

Ayelander - Oak Island NC
1951 Chevy 3100, 261 cu in, Dual Webers, Fenton Exh
1963 Impala SS, 500 HP, EFI 383 Stroker,Tremec 6 Speed
2013 Camaro 2SS, Convertible
2016 Chevy High Country, Diesel, Dually


 
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
06-25-21 11:17 AM - Post#2822086    
    In response to ayelander

it's rated at about 440 hp



 
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
06-25-21 11:25 AM - Post#2822087    
    In response to ayelander

they also recommend a 2000-2400 stall converter.. can you say what you used with yours? I'm hoping to keep my 2 speed powerglide if possible



 
ayelander 
"3rd Year" Platinum Supporting Member
Posts: 130
ayelander
Loc: Oak Island NC
Reg: 12-07-18
06-25-21 06:01 PM - Post#2822104    
    In response to Adam63impala

I have a 6-speed Tremac Manual hooked to it.


Ayelander - Oak Island NC
1951 Chevy 3100, 261 cu in, Dual Webers, Fenton Exh
1963 Impala SS, 500 HP, EFI 383 Stroker,Tremec 6 Speed
2013 Camaro 2SS, Convertible
2016 Chevy High Country, Diesel, Dually


Edited by ayelander on 06-25-21 06:02 PM. Reason for edit: No reason given.

 
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
06-29-21 10:02 AM - Post#2822309    
    In response to ayelander

do u know what size the original fans is ? looking at 5 or 6 blade fans and wondering what size I need? I see 15" 19" etc



 
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
06-29-21 10:35 AM - Post#2822310    
    In response to japete92



do u know what size the original fan is ? looking at 5 or 6 blade fans and wondering what size I need? I see 15" 19" etc





 
japete92 
"7th Year" Silver Supporting Member
Posts: 1677
japete92
Loc: No. Virginia
Reg: 01-18-13
06-29-21 12:32 PM - Post#2822319    
    In response to Adam63impala

  • Adam63impala Said:


do u know what size the original fan is ? looking at 5 or 6 blade fans and wondering what size I need? I see 15" 19" etc






Neither 15" nor 19" was GM OEM in '63. From memory, the 409 was 18" w/staggered 5 blade fan w/clutch (as were all the 327s 300 hp and above; AND cars with A/C). Six cylinder and other V8s got a 17 1/2", 4 blade non-clutched.

If you are NOT using a fan clutch, something like this:

https://www.classicchevy.com/full-size-chevy-cooli ...

That's not GM OEM, but will function. I used that fan for a couple of years but found it to a little loud at higher rpm. The OEM clutched 5 blade (staggered) fan cools sufficiently and makes less noise.

Pete





 
Adam63impala 
Contributor
Posts: 842
Adam63impala
Loc: From Memphis to Florida
Reg: 12-01-15
07-01-21 04:28 PM - Post#2822468    
    In response to dcairns

what transmission ya running? I'm wondering if my powerglide can handle it



 
dcairns 
Frequent Contributor
Posts: 2234
dcairns
Loc: Orange CA
Reg: 11-07-03
07-01-21 06:50 PM - Post#2822473    
    In response to Adam63impala

I have a 700r4 which cools through the stock radiator.

- Dave
1964 Impala 4-door sedan



 


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