Radiator questions - Chevelle Tech
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post #1 of 35 (permalink) Old Apr 1st, 20, 6:05 PM Thread Starter
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Radiator questions

I'm planning to replace the old 307/PG in my '69 with a 383/700R4, nothing crazy but around 400-450 hp and 1500-1800 rpm converter. My question is if a std BB radiator will work for this, and if I should go with one for automatic or manual transmission (integrated trans cooler vs separate). I figure an integrated cooler will reduce the wear on the transmission while it warms up, but I'm not sure if it would work all that great on a hot summer day. Would also like to know what else I need to get to put a BB radiator in it.

1969 Malibu in progress
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post #2 of 35 (permalink) Old Apr 2nd, 20, 9:14 AM
 
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Re: Radiator questions

How many cores are your original? If 4 core, you are probably ok. 3 core you probably need to update.

If switching out, I suggest upgrading to a large 2 core aluminum.

Having the trans cooler integrated doesn't really affect cooling capacity as much as you think. I always suggest it if you even have the idea of running lines to it. Only get the manual version if you plan on never using it or swapping the trans.

Let me know if I can help with any more questions or suggestions on product
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post #3 of 35 (permalink) Old Apr 2nd, 20, 9:18 AM
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4 row Champion. Fan seldom comes on. 383/480, 160 Tstat
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post #4 of 35 (permalink) Old Apr 2nd, 20, 9:36 AM
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Re: Radiator questions

I would use a Champion three core with the transmission cooler/warmer... I never used an extra cooler.. Not sure if flipping it into neutral at long stop lights does anything but I get over 100,000 out of a transmission.
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post #5 of 35 (permalink) Old Apr 2nd, 20, 10:33 AM
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Re: Radiator questions

For my 67 Chevelle I replaced the old original SBC Rad with a Direct replacement from Alumitech
Alum 23.5" Wide x 16" Hi Core with 2 Rows of 1.25" Wide Tubes / Manual DF Rad for my BBC
separate Trans Cooler located away from and down Low in Front of the Rad Core
as I only drive my car in dry warm weather

Twin SPAL 11" Efans with a Plastic/Fibre Glass Shroud with Rubber Flaps that open up when on the Hwy
and close for in the City

160* Thermostat in the Intake and Temp Gauges for the Engine and Trans
Engine Runs 175* to 195*

For your 69 a Alum 2 Row Core with 1.25" Wide Tubes Manual XF Rad is the way to go IMHO

https://www.dewitts.com/collections/...adiator-manual
Model: 1149003M (Natural/Manual) or Model: 1249003M (Black/Manual)
they do not provide the Measurements of the Rad Core or the Overall width & Height
OR

https://www.coldcaseradiators.com/pr...model/chevelle
https://www.coldcaseradiators.com/pr...mance-radiator
Core Height: 29"...Core Width: 18.5"...Overall Height: 18.75"...Overall Width:
34.75"

AND
install a Dual Efans/Shroud that fits the Core of the Rad you buy
if you are not wanting to use a Mechanical Fan Clutch & Shroud
https://www.jegs.com/p/JEGS/JEGS-Dua...14845/10002/-1

https://www.jegs.com/p/SPAL/SPAL-Hig...61438/10002/-1

https://www.jegs.com/p/Be-Cool-Radia...98459/10002/-1 Bottom of page 2

https://www.summitracing.com/int/parts/flx-298/overview
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67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #6 of 35 (permalink) Old Apr 2nd, 20, 11:16 AM
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Re: Radiator questions

Quote:
Originally Posted by eric_cspan View Post
How many cores are your original? If 4 core, you are probably ok. 3 core you probably need to update.

If switching out, I suggest upgrading to a large 2 core aluminum.

Having the trans cooler integrated doesn't really affect cooling capacity as much as you think. I always suggest it if you even have the idea of running lines to it. Only get the manual version if you plan on never using it or swapping the trans.

Let me know if I can help with any more questions or suggestions on product
Quote:
Originally Posted by hydro462 View Post
I would use a Champion three core with the transmission cooler/warmer... I never used an extra cooler.. Not sure if flipping it into neutral at long stop lights does anything but I get over 100,000 out of a transmission.
cores?

.
.
.
.


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post #7 of 35 (permalink) Old Apr 2nd, 20, 2:52 PM
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Re: Radiator questions

https://www.summitracing.com/parts/flx-295?rrec=true $ 366.us
https://www.jegs.com/i/Flex-A-Lite/400/295/10002/-1 kit includes mounting brackets ,
adjustable thermostat (160-240 degrees), an air conditioning relay, and a variable speed control.
Fits models with 28 in. wide core only.

APPEARS TO HAVE RUBBER FLAPS
Maximum Fan CFM: 4,600 cfm / Fan Diameter (in): 13.500 in.
Height (in): 17.500 in. / Width (in): 27.500 in.
Thickness (in): 4.000 in. / Maximum Fan RPM: 2,100 rpm
Amp Draw: 28.00 amps / Air Conditioning Relay Included: No
Mounting Brackets & Mounting Hardware Included Notes: Fits models with 28 in. wide core only.

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #8 of 35 (permalink) Old Apr 2nd, 20, 4:04 PM
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Eric
 
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Re: Radiator questions

I would just keep the original radiator and see if it keeps up before throwing a lot $$$$ at a problem that may not exist.
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1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
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post #9 of 35 (permalink) Old Apr 2nd, 20, 5:06 PM
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Re: Radiator questions

What are the thoughts of a cross-flow radiator versus a downflow?

67 Chevelle Malibu, ZZ4 350 crate engine, TH350, FiTech EFI, Vintage Air, Dakota HDX dash, FlowMaster exhaust,
17" Rally style wheels, Redline tires
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post #10 of 35 (permalink) Old Apr 2nd, 20, 9:33 PM
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Re: Radiator questions

It is mainly about size
the more Square Inches the more area that will be able to be cooled down

https://www.chevelles.com/forums/32-...wich-best.html

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #11 of 35 (permalink) Old Apr 3rd, 20, 9:21 PM Thread Starter
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Re: Radiator questions

Thanks guys, seems like there's plenty of options! I have been away from the hobby for many years now, and I sure didn't know there were so many drop in performance radiators nowadays.

1969 Malibu in progress
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post #12 of 35 (permalink) Old Apr 3rd, 20, 11:42 PM
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Re: Radiator questions

HI
All about the largest area in Sq`inches u can present to air flow .
Once the above is done going thicker is your next option

The standard in HiPo radiators are
2 x 1 inch cores /tubes
2 x 1.25 inch core tubes

A factory style will have 1/2 9/16 5/8 tubes cores
Always get the 3 --4 core versions

Other points are
core spacing --pitch common is 3/8
cooling fins per inch typically 14
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post #13 of 35 (permalink) Old Apr 4th, 20, 12:08 AM
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Re: Radiator questions

Olle I also opened up my core support opening for more flow when I put a big block where a 307 used to be in my 68 and used a champion 2 tube alum rad and dual 12" derale E fans


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post #14 of 35 (permalink) Old Apr 4th, 20, 4:57 AM
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Re: Radiator questions

Good info^^^^


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post #15 of 35 (permalink) Old Apr 4th, 20, 10:32 AM Thread Starter
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Re: Radiator questions

Quote:
Originally Posted by shovelrick View Post
Olle I also opened up my core support opening for more flow when I put a big block where a 307 used to be in my 68 and used a champion 2 tube alum rad and dual 12" derale E fans
I haven't checked the radiator support yet, but if there's rot in it I might replace it with a new one. IIRC, the upper bracket comes in two widths, so are the radiator supports different as well?

1969 Malibu in progress
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