Ron Davis makes high quality aluminum radiators, I have one in my Jeep CJ.

In my 67 I use a stock 2 core with a mild 350, recently drove 10 hours at 3000 rpm, temp was steady 195° with a 180° stat.

 

I bought the summit direct fit alum radiator and its really nice fit perfect with stock shroud and all the bolt holes line up great :thumbsup:

 

I am using a champion.
the only problem I have with it is, the person that welded it must have been drunk

 

I have a Griffin 23'' direct fit with 2 rows of 1 1/4'' tubes. Great fit, excellent quality, and made in the USA. I have run on the highway at 3400 rpm for 3 hours, sat in traffic, and cruised around town stop light to stop light, and I never get above 185 degrees. These radiators are a little pricey, but they are well worth it. Griffin gets my vote.:thumbsup:

 

Factory brass...they are way over built never have an issue
the ONLY issues that do happen is a lack of maintenance of the cooling system and hoses...which is a user issue and all raditors are prone to it.
From new in '69 Im on my 3rd radiator in 300,000 miles
Check out old posts.. us old guys who have been with these cars for decades all use factory.

Dont get caught up in the marketing propaganda BS of better cooling etc...
put it this way.. if u are going to drop a 1" square peg in a 6" round hole... nps heaps of room.... so why do need a 6 1/4" diameter hole?

 

Just installed a griffin direct fit ls1radiator in my 67 can not comment on cooling yet but quality and fit are awesome and price was half of a Ron Davis. So far it has my vote will test function come spring