SS #670 Modifications:
Radiator

[SLP Performance Parts]

I've always thought the factory radiator was just barely adequate. One 90° day on the track at Buttonwillow, CA, my oil and water temperatures ran 225°. Of course this was shortly after installing an engine oil cooler or else my oil temperature would have been ridiculous.

[SLP 52467 radiator]

Ultimately I decided to use the SLP high-capacity radiator (52467). Note: SLP has discontinued this part. The original label was blacked out but I was able to read enough of the GM part number to verify this is a radiator for the 1993-1996 5.7 automatic/manual transmission F-Body (GM 52466004). SLP adapted it for use with the LS1 cooling system by epoxying shut two unused tank fittings and then covering them with vinyl caps. Radiator core thickness on LS1 F-Body cars is 15/16". The 1993-1996 LT1 radiator is 1-3/8" making it 47% thicker.

[AC/Delco 20700 radiator]

Here's a chart that shows all of the radiators used with 4th generation F-Body cars. From 1993 through 1997 one part number is used for automatic and manual transmission applications. Starting in 1998 there are separate versions for the automatic and manual. Overall there's been a general trend towards thinner cores.

Year Application Core GM Delco Delphi
1993-1996 5.7 man/auto 1.375" 52466004 20700 RA1081
1997 5.7 man/auto 1.000" 52472602 20883  
1998-1999 5.7 man 0.937" 52471356 20924  
1998-1999 5.7 auto 0.937" 52471357 20925 RA1114
2000-2002 5.7 man 0.937" 52487149 21344 RA20058
2000-2002 5.7 auto 0.937" 52487150 21345 RA20059

It might be possible to build a radiator with an even thicker core from parts. The inlet and outlet tanks and tank gaskets appear to be available as new parts so that hard part would be to find a core that was thicker while maintaining the same width, height and plate dimensions.

Coolant

I filled my system with a 50/50 mix of AC/Delco Dexcool distilled water and topped off with a bottle of Red Line WaterWetter®.

[AC/Delco Dexcool antifreeze][Arrowhead distilled water][Redline Water Wetter]

[AC/Delco] [Red Line Oil]

Installation notes


[LG Motorsports]

My Previous Setup

In 2003, LG Motorsports introduced the G2-Super Cool radiator (G2-SCR-FM). It's a TIG welded, all aluminum piece that is manufactured for them by Howe Racing Enterprises.

[G2-Super Cool radiator] [G2-Super Cool radiator box]

The radiator was rated to 700 HP, about double the factory aluminum and plastic part. More than just a custom sized radiator, the G2-Super Cool had tabs to hold the fan shroud assembly, bottom mounting peg and other special touches. It's clear a lot of work went into making it fit into the Camaro engine bay.

[installed radiator]

I'd wanted a bigger radiator for some time but was holding out for a built in oil cooler. The G2-Super Cool utilizes a Howe heat exchanger. They make them in two sizes; 10-1/4" and 12-1/2" (measured center-to-center). The G2-Super Cool uses the larger unit.

[Howe heat exchanger]

The radiator definitely did a good job. During a visit to the track at Buttonwillow my water stayed down around 190°! However oil temperature was up at 225° which makes me believe the heat exchanger isn't quite big enough. As a result, I went back to using my external oil cooler setup. It's too bad there wasn't room in the radiator tank for a larger heat exchanger as this style setup does not need a separate oil thermostat and has much simpler plumbing. And in theory, the radiator based heat exchanger should heat the engine oil during warm up from a cold start. But in practice, this effect appeared to be small.

Fittings

I wanted to stick with aluminum fittings for the overflow and throttle body outlet but couldn't find any. Both the throttle body outlet and overflow hoses are 3/8" ID. I also wanted the OEM style beaded hose barbs so I could reuse the factory hose clamps. Eventually I found some chromed brass fittings at a local speed shop:

I used 1/2" pipe to -10 AN fittings (Parker 10-FTX) to interface to the heat exchanger. More oil line details can be found on my engine oil cooler page.

Drain cock

For a drain cock, I used a nice little brass part I got from my local speed shop. It looks the same as a Be Cool 72025.

[drain cock] [installed]

Installation notes


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[SS #670 Mods: Sway bars] [SS #670 Mods: Shocks and struts] [SS #670 Mods: Springs] [SS #670 Mods: Panhard bar] [SS #670 Mods: Lower control arms] [SS #670 Mods: Subframe connectors] [SS #670 Mods: Adjustable torque arm]
[SS #670 Mods: Differential] [SS #670 Mods: ZR1 wheels] [SS #670 Mods: Shock tower brace] [SS #670 Mods: Brakes] [SS #670 Mods: Hurst billet plus shifter] [SS #670 Mods: Heel/Toe throttle extension plate] [SS #670 Mods: Driveshaft safety loop]
[SS #670 Mods: Radiator] [SS #670 Mods: Oil cooler]
[SS #670 Mods: Differential vent tube] [SS #670 Mods: Shiftlight] [SS #670 Mods: Airbox lid] [SS #670 Mods: Polyurethane bushings]
[SS #670 Mods: Auto Meter gauge pod] [SS #670 Mods: Disable CAGS] [SS #670 Mods: Disable daytime running lights]

[SS #670 Mods: EFILive] [SS #670 Mods: LS1_Edit]
[SS #670 Mods: Battery] [SS #670 Mods: Valentine One remote display] [SS #670 Mods: Headlights] [SS #670 Mods: iPod integration] [SS #670 Mods: LEDs] [SS #670 Mods: Cellular phone] [SS #670 Mods: Zaino Bros' show car polish]

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Craig Leres