which rad?

All rows are not created equal. Alumunum rads have an inch or wider "rows". Stock type 4 row rads are about the same tickness as a 2 row aluminum. I say aluminum. Lighter and better heat transfer.
 
65fastback2+2 said:
a 2 row aluminum

or

a 4 row stock

????????

Aluminum all the way. My old 4 row couldnt cool a beer, let alone an engine. I switched to a Summit brand aluminum (Northern) and its been cool runnings ever since.

Get a nice thermostatically controlled fan too :)
 
Cantedvalve said:
Get a nice thermostatically controlled fan too :)

I put one of those in recently, but I'm having some trouble with that -- where did you mount the thermostat? In the radiator or in the cylinder head/block? The fans aren't coming on soon enough, and I think it has something to do with where I mounted the thermostat - on the inbound side of the radiator.