I understand you should convert to dual fans
when you do the swap but I wonder what experience is from those who have done the swap. Thanks.......bob

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91 camaro RS L03 convert,
t-5, ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets

 

I did the swap, but am still using the single fan for now. if it should burn down I'll likely replace it with duals. no over heating problems yet, but then the warmest its gotten so far around here is 40 degrees. and I'm running a 160* Tstat, w/ a hole drilled in one side.

 

when I did my LT1 swap, I left the original single fan after I had to replace the motor on it. with it pretty cold this winter I haven't had any overheat problems, but during the summer if I let it idle for very long it would start to get hot real quick, thats with the fan hard wired to be on all the time. if it helps any, I'm going to try to switch to the dual fans this spring

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-'92 RS with self-installed '95 LT1
-Heddman Headers
-TPIS throttle body airfoil

Kills
-'98 V6 Camaro
-'89 5.0 ****stang
-'97 Sebring
-'96 ****stang Cobra

Losses
-'99 Mustang GT
-'96 Mustang Cobra

 

Mine wasn't a 305 to 350 swap, but after it all was said and done, i ended up running the single electric fan with my 350. It's been through one summer so far, and hasn't really given me any problems. It cools a lot better than any belt driven fan i had on there. Oh yeah, 160 degree t-stat. I only have to watch it when i'm sitting still with the A/C on for long periods of time.

 

I hard wired mine and have been through summer without any problems what so ever. My buddy did the same thing and he rarely sees temps over 160 in traffic.

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91 RS W/carbed 350, Vortec heads, performer rpm, Comp cams Xtreme energy 226/230 duration and .477/.480 lift. BFG Drag radials. 3.42 posi,Corvette servoed 700r4, ****ty stock converter.
13.24@104

 

I swapped to a supercharged 355 years ago and have been using the single fan all along.
It isn't hardwired, that makes it take too long to get to operating temp, burns up fan motors quicker, & may actually contribute to overheating. I let the ECM control the fan with a custom prom that turns the fan on at 190° and back off at 170°.
In the beginning when I installed the new engine I added a "Flowcooler™" type plate cut from 22 guage steel to the water pump impeller. I don't know that it needed improved flow as I didn't try it without it, but it was a free improvement. I use a Robert Shaw type high flow thermostat (180°). I used the stock original radiator until the plastic tanks began to crack from age about a year ago. I then installed an all aluminum one.

I also have a friend with an 83 TA with a 406 CID small block. He also uses a 180° coolant thermostat, but a completely stock waterpump. He is using the same type stock single fan as me. When he bought the car it had a non adjustable fan stat on top of the themrostat housing. It was ugly so he took the housing off and replaced it with a chrome one. He hardwired the fan. After that it did OK until hot days. It would heat up to 210°-220° and level out there. He then bought the electronic thermostat and hooked it up. At first it still ran hot. We had it set to turn on too soon. We set it back to turn on later(hotter) and the car actually cooled down, the fan didn't run as much, and the car runs right at 180°-190° which is where he wants it.
If your car over heats be sure to check the radiator core for plugging. Also as the fan motor gets older it slows down and might not be moving enough air.

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Tracy /AKA IROCKZ4me

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
Club IROC-Z

 

I used a dual fan setup from the 4th gen cars. They move a lot of air and work great.

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

 

Mine wasn't a 305 to 350 swap, so my experience might not apply.

I went from a 305 to a 400 about 10 years ago.

I kept the stock single fan that came with the 83 HO package. Seems to work fine. I agree that the dual setup ought to work better, but with proper setup, the single will work too.

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"So many Mustangs, so little time..."

 

Great ideas and thoughts. Thanks to all for the replies...........bob

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91 camaro RS L03 convert,
t-5, ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets

 

i also did this swap and am using only one fan still and a 180 thermostat you might need a new or bigger than stock radiator.

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?