radiator difference - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brak · 06-01-2007, 04:46 AM

Is there a difference between the I6 and V8 radiators other than core size?

My truck originally came with an I6, but was converted to V8 in the I6 position. I've since moved the motor to the correct position, and can't find a hose that fits correctly.

I'm guessing the radiator is to blame...

dave2953 · 06-01-2007, 01:22 PM

Is it the upper or lower? I had to modify my upper a bit to get it to fit, but I'm not sure if you're having the same issue. Hopefully my bump will yield better responses.

**67 cst swb** · 06-01-2007, 01:49 PM

The only difference from I-6 to V-8 radiator is the width and thickness of the CORE. I-6 cores are 26-3/8" wide (header seam to header seam) and 1-1/4" thick. The V-8 cores are 28-3/8" wide and either 1-1/4", 2", or 2-5/8" thick. The tanks are the same from I-6 to V-8 (except the 2-5/8", they are thicker)
So, there should be no difference, except that the passenger side is 2" inches wider as far as the mount is concerned, so, that would change your lower hose location exactly 2" outboard from the stock 6 cyl location. Call me at work 605-341-6634 (I work at a Radiator Shop) we can talk about what you have. I can have you do some measurements and ask you some questions to figure this out...

70C10FI · 06-01-2007, 03:55 PM

Not getting to far off topic...ha! What is the position difference from I6 to 350 mounting??

**67 cst swb** · 06-01-2007, 04:35 PM

The passenger side saddles are the only difference. If you notice there are 3 holes in the top of the radiator support for the top radiator hold down (the middle hole is shared, either left bolt hole or right bolt hole depending), as well as two mount locations for the lower saddle mount in the bottom of the radiator support.
That is what makes up the 2" difference in radiator widths at the saddle mounts. The drivers side saddle mount location stays in same location regardless of I-6 or V-8...
Does that help?

brak · 06-02-2007, 06:29 PM

thanks for the replies.

it is the lower hose that i was having issues with, as the outlet is directly over the frame. The I6 hose, has a bunch of curves and clears the frame, but the V8 hose is completely straight on the radiator end, causing clearance problems with the frame.

I ended up chopping Half of the hose off, and getting it to work until i can get the correct radiator.

06-01-2007, 04:46 AM	#1
brak Registered User Join Date: Apr 2006 Location: MinneSNOWta Posts: 1,381	radiator difference Is there a difference between the I6 and V8 radiators other than core size? My truck originally came with an I6, but was converted to V8 in the I6 position. I've since moved the motor to the correct position, and can't find a hose that fits correctly. I'm guessing the radiator is to blame... __________________ 2003 GMC Sierra 1500 WT 1995 Nissan Hardbody 2016 Hyundai Veloster Turbo DC2 (SW/AW) Clyde W. Harvey USN "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery" Winston Churchill

06-01-2007, 01:22 PM	#2
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: radiator difference Is it the upper or lower? I had to modify my upper a bit to get it to fit, but I'm not sure if you're having the same issue. Hopefully my bump will yield better responses. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250

06-01-2007, 01:49 PM	#3
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Re: radiator difference The only difference from I-6 to V-8 radiator is the width and thickness of the CORE. I-6 cores are 26-3/8" wide (header seam to header seam) and 1-1/4" thick. The V-8 cores are 28-3/8" wide and either 1-1/4", 2", or 2-5/8" thick. The tanks are the same from I-6 to V-8 (except the 2-5/8", they are thicker) So, there should be no difference, except that the passenger side is 2" inches wider as far as the mount is concerned, so, that would change your lower hose location exactly 2" outboard from the stock 6 cyl location. Call me at work 605-341-6634 (I work at a Radiator Shop) we can talk about what you have. I can have you do some measurements and ask you some questions to figure this out... __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White

06-01-2007, 03:55 PM	#4
70C10FI Registered User Join Date: May 2007 Location: Colorado Posts: 26	Re: radiator difference Not getting to far off topic...ha! What is the position difference from I6 to 350 mounting??

06-01-2007, 04:35 PM	#5
67 cst swb Senior Member Join Date: Nov 2001 Location: Rapid City, SD Posts: 2,281	Re: radiator difference The passenger side saddles are the only difference. If you notice there are 3 holes in the top of the radiator support for the top radiator hold down (the middle hole is shared, either left bolt hole or right bolt hole depending), as well as two mount locations for the lower saddle mount in the bottom of the radiator support. That is what makes up the 2" difference in radiator widths at the saddle mounts. The drivers side saddle mount location stays in same location regardless of I-6 or V-8... Does that help? __________________ My Trucks: 1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project 1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver 1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck 1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck 2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White Last edited by 67 cst swb; 06-01-2007 at 04:37 PM.

06-02-2007, 06:29 PM	#6
brak Registered User Join Date: Apr 2006 Location: MinneSNOWta Posts: 1,381	Re: radiator difference thanks for the replies. it is the lower hose that i was having issues with, as the outlet is directly over the frame. The I6 hose, has a bunch of curves and clears the frame, but the V8 hose is completely straight on the radiator end, causing clearance problems with the frame. I ended up chopping Half of the hose off, and getting it to work until i can get the correct radiator. __________________ 2003 GMC Sierra 1500 WT 1995 Nissan Hardbody 2016 Hyundai Veloster Turbo DC2 (SW/AW) Clyde W. Harvey USN "Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery" Winston Churchill

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