The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1990 Suburban 2500

gangforward · 02-02-2007, 02:39 AM

The big block radiator is thicker than the small block - you have to remove the core supports and replace them with the big block versions. The tops are easy, they are a simple bolt on (on my truck anyway) - the bottoms were riveted in, you drill out the rivet, and I had to modify the mount a bit, then install the larger bracket. I avoided the fan/fan cowl issues by going to an electric kit with dual fans - and gained power by losing the fan too. I have mine set so it runs till the water is cooled a certain amount even if the truck is off, get lots of looks when I pull into the gas station.

I've even run the truck in a 4th of July parade when the temps were in the high 90's. Temp never went above 190 the whole time.

02-02-2007, 02:39 AM	#8
gangforward Hootis is as Hootis does... Join Date: Nov 2002 Location: Southern Georgia Posts: 500	Re: 1990 Suburban 2500 - 350 to 454 Swap? The big block radiator is thicker than the small block - you have to remove the core supports and replace them with the big block versions. The tops are easy, they are a simple bolt on (on my truck anyway) - the bottoms were riveted in, you drill out the rivet, and I had to modify the mount a bit, then install the larger bracket. I avoided the fan/fan cowl issues by going to an electric kit with dual fans - and gained power by losing the fan too. I have mine set so it runs till the water is cooled a certain amount even if the truck is off, get lots of looks when I pull into the gas station. I've even run the truck in a 4th of July parade when the temps were in the high 90's. Temp never went above 190 the whole time. __________________ 67 C10 LWB Fleet, 383, TH400, PS, 4BL-Holley, Headers & 3" Exhaust, 3" drop front, 4" rear springs, ECI shock relocate, Panhard Bar kit, wheels & tires 1995 Z28 Convertible - Borla, K&N, Lingenfelter Motor, C6 Wheels & Tires 1990 2500 4x4 Suburban 3" Catbac System, K&N, 2" Lift, Wheels, Tires Last edited by gangforward; 02-02-2007 at 02:40 AM.