Anyone running a 2 row 1" tube alluminum rad successfully with a 400+ small block? I have a Griffin 26x19 rad. Griffin says it isn't enounh for a 425HP 383, fine for a mild 350. The rad is new and I was under the impression it was enough from some of the past posts? After fixing a fuel leak I am ready for the first drive and trying to get to the bottom of a possible overheating issue. Thanks.

Noel

Radiator efficiency can be affected several ways. One is shear conduction area, the second is coolant flow, the third is airflow. Changes in any of these WILL affect the outcome.

My two row aluminum crossflow in the 430+Hp/357cu with air ragtop works well here in Hotlanta. So, I would say you are okay with a high end Griffin with all the amenities.

I would however make sure I have high flow waterpump, thermostat, and lot's of air production. I think you will be fine.

Thanks! I think the first thing I am going to do is move the electric fan off the rad core by about 1/2". Griffin says they don't recommend it being tight against the core as it only allows pull through that section. But if it is backed off a bit it will pull from a wider area even without a full shroud. Is there any truth to the point that a full shroud actually restricts flow at speed? Thanks again for the input!

Noel

You can move the fan off a smiggin....but I don't think it's going to make a huge difference. Shrouds can block air. If you look at the Spal dual 11" set-up there is actually relief ports/one-way flaps cut into the back of huge shroud.

Airflow easily surpasses the cfm of the fan in full shrouds when cruising at speeds, so depending on the design of the shroud is the key.

Thanks Steve. Really appreciate you taking the time to reply!
Noel