| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,164 Posts1,056,982 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 168 'Bolter | | 'Bolter Joined: Sep 2001 Posts: 168 | I have a couple questions about this RPO, for anyone that might have a 3600 series, or for that matter 3800 series truck with the optional 2.5" core radiator and fan shroud.
A) Does anyone have this setup?
B) Do you know if the core support is actually a different part for this thicker core?
The salesman's data book doesn't mention it, but I'd almost think it'd have to have a different core support.
I have a 55.1 3604, and I'd like to see if I can put this setup together for my truck.
1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO
| | | | | Joined: Aug 2005 Posts: 1,186 Shop Shark | | Shop Shark Joined: Aug 2005 Posts: 1,186 | Go for it! I'm doing this to my 3800 . I have the big radiator with a shroud I'm putting in my truck. I test fitted it and it slides in perfect with no modifications. I wanted the extra cooling even though I'll probably never use the truck to it's limits. Bruce | | | | | Joined: Sep 2001 Posts: 168 'Bolter | | 'Bolter Joined: Sep 2001 Posts: 168 | From that picture, it looks like yours is an OE Harrison unit. Can you tell me what the part number on the top tank is? That'll help me to locate one. Then I just have to find a shroud! Or get a detailed drawing and try to build my own. I'm wondering if there is an HD fan that supposed to go with this setup as well? Stock fan for the smaller trucks is a four blade 18" fan. What are you running on yours. I like that truck, btw. Thanks for the reply.
1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO
| | | | | Joined: Aug 2005 Posts: 1,186 Shop Shark | | Shop Shark Joined: Aug 2005 Posts: 1,186 | Any of the Advance Design radiators should work. Mine is dated 50 (1950?). You should be able to locate a fan blade by running an ad in the wanted section. I parted out a '54 2 ton so I'm using the 261 and shroud from that truck. You could probably use the smaller fan but it might affect cooling???? I think I have other radiators and several shrouds if you don't have one or can't find one.
Bruce | | | | | Joined: Sep 2001 Posts: 168 'Bolter | | 'Bolter Joined: Sep 2001 Posts: 168 | I'm going to be running a 261 as well. Send me an email to [email protected] I'm definitely interested in talking further about this. I have a couple of stock 2" core radiators. Thanks!
1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO
| | |
|
|
| |
