I'd have to ask what the problem was to start with.  What engine are you running, were you running hot before, etc?  I'm not sure, but I don't think the 67's used a shroud (but I think I'm thinking of a 67 Canadian Pontiac, possibly different than an Impala).

My 70 2+2 ran hot with the 454, so I put in a 4 core rad out of a big block air conditioned car.   I had it recored, so just reused the top and bottom tank.   It's worked fine since.   

Although crossflow rads were being introduced in the 1960s, starting with Corvettes, the 1965 Cadillacs, they were not introduced on full-sized Chevies or Canadian Pontiacs until after 1970. The 1970 Big Chevrolet & Big Canadian Pontiacs were the last to hold out with the downflow radiator style. Acadians & Beaumonts got the crossflow style for 1968.

If you get your original rad recored, don't go overboard on the number of "rows of cores". The theory is by adding cores you increase the cooling area, but the reality is there is a law of diminishing returns. The added density of fins & rows means that air doesn't flow as easily as it would through a rad that wasn't stuffed full of cooling fins.  That, plus heat is getting thrown off at the first row, so that by the time it flows through the 4 row the tempurature difference between the cooling air and the radiator fins decreases, slowing the heat transfer & efficiency. Like I said, diminishing returns. I would make sure that you use the full width of the rad for cooling fins though, but you probably don't need to go more than 3 core. Most standard rads back then were only 2 core.

A fan shroud will help, especially if the fan & shroud opening are correctly oriented (fan is placed at the right depth & shroud optimally placed to match the fan depth). The shroud helps most when the car is stationary and doesn't have air pushing into the engine compartment. A shroud will force the fan to draw air through the rad rather than from in behind it.

Antique Chev said that they couldnt get a decent price from suppliers for aluminum rads.

Well, I returned the rad and transmission cooler today.   Full credit.
I kept the Edelbrock high output water pump.

Will delay the rad issue for now so that I can do some more research. Made a couple of phone calls today.

Looking into a 4 row aluminum rad with shroud and two electric fans.

Cliff

Vaughan wrote:

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I have re-cored two radiators for my old cars. Both were original equipment 2 row core rads. I went with what the rad man called a 3 row high efficiency core. This 3 row design has almost as many tubs and fins as the old 4 row cores did. Cost was in the 400$ range, so not cheap but I liked the original appearance versus using an aluminium rad. I am pleased with the performance, no temperature issues, even on the hottest days.

 

Vaughan

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 That's what I had "built" for the 52 but haven't got to drive it yet other than a "blast" up the street!!! your news sounds "encouraging" though  Thanks