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66-71 GM 28.25" Copper/Brass Crossflow Radiator 4 row core Curved Bottom Neck

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Copper/brass GM radiator Made in USA
MSRP: $725.00
This product is in stock now!!
Part Number: CR 03690 AR
Manufacturer: Classic Radiator
Manufacturer Part No: CR 03690 AR
Custom Built to Order by Classic Radiator in the USA


1 Year Guarantee

 This is a Custom-Built radiator! Although it shows “zero” in stock, we do keep the parts needed to build this radiator on hand, so please call us to place your order and we will build the radiator within 1-5 business days. Call for a more accurate time estimate. Please see below for customization information.

 If you go into your local auto parts store and order this radiator, they will likely offer you a plastic tank / aluminum core radiator of inferior quality that will not fit perfectly or look anything like an original and isn’t even made in the USA. We are aware that parts-store radiators are much less expensive than ours. But they do not fit as well, nor look correct like ours do. They also won't cool your valuable engine nearly as well! This 4-row radiator will cool your engine twice as well as any plastic-tank aftermarket radiator!

 This GM replacement radiator has a 28¼" core width between the tanks, and is 18½" tall including side channels. It has four rows of ½" tubes and a 12" transmission cooler with 3/8" inverted flare fittings in the outlet tank. The upper hose neck has an outside diameter of 1½". The lower neck is 1¾" O.D. It differs from the CR 03690 AR in that the lower neck on this radiator is curved upward. If your radiator requires a lower neck that points out straight, use CR 03480.

100% MADE IN USA 1 Year Guarantee

 Before ordering this radiator, please confirm that the radiator you need has a core width of 28¼" between the tanks and a 1½” diameter top hose connection. This radiator has four rows of ½" tubes on 9/16" centers. This radiator has a straight 1¾" diameter lower neck.  The tanks are 3½" wide at the headers. If upgrading from a three-row radiator, please make sure that you have fan clearance and that the mounting rubbers are 3½", not 2¾". If you need toreplace your rubber mounts, please order four (4) of part number ULR-004. Applications for this radiator include:

71-73 Centurion
73-77 Century & Regal w/V-8
1970 Electra, Estate Wagon, LeSabre
72-73 Skylark w/V-8 

70-71 Chevelle, Monte Carlo

66-71 Delta 88, Delmont 88
66-70 98
66-69 Cutlass, F-85 

66-71 Grand Prix
66-70 98, Bonneville, Catalina
68-71 LeMans

This radiator can be custom made in multiple versions to suit your specific needs. The part number listed here is a standard 3-row core with an AUTOMATIC transmission cooler built into the passenger side tank. It can be built WITHOUT the transmission cooler for MANUAL transmission applications.

It can also be built with a high efficiency style core that provides about 20% better cooling without increasing the core thickness or decreasing the fan clearance. By placing the tubes on closer centers to each other, more surface area is built into the core (without sacrificing airflow) for better heat transfer.

CR 03690 AR – Automatic transmission with standard cooling
CR 03690 AH – Automatic with high efficiency cooling
CR 03690 MR – Manual transmission with standard cooling
CR 03690 MH – Manual transmission with high efficiency cooling

If you want to confirm that this is the correct application for your vehicle, please contact us via phone or e-mail. It does not have a heater return neck as do most generic replacement radiators. 

100% Made in USA 1 Year Guarantee

Cap-A-Radiator from Teena Nawabi on Vimeo.