They work great.

6000 + miles on my 505" RB.

Hundreds of dragstrip passes.

Never any issues using the stock '65 radiator and factory clutch fan.

Takes 600 hp and a 200 shot of nitrous like a Walrus takes to water!

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.