I'm running a Griffin single core in my 73 Scamp with a 408 pushing 470 HP and 500 ft. lbs. torque.
Made a long trip from North Dakota to Pennsylvania and hit Chicago both ways at rush hour traffic first of this month 1.5 hours in a traffic each time at 85* outside and temp gauge stayed in the normal.
10,000 miles on my car with a Griffin and no over heating ever.