Sk8runeg

iTrader: (11)

My friend just picked up a 1991 Z28 with a Dart 400 with either AFR heads or Blownfield(??) heads but we are not sure cause someone is definitely lying about something. Steel 4340/3500 stroke crankshaft, forged internals, titanium valves, and so on. The compression is 13:1 and it has a TH400 with a 12 bolt rear with 3.73 gears.

Anyways, we were on our way to get it dynoed and the car overheated to lik 270 degrees. We pulled over and it smoked and blew all the antifreeze out of the overflow. I figured it was just cause the car was at like 4000 rpm the whole ride and there is no air dam so it wasnt cooling enough.

So, we got it towed home and i filled it up with antifreeze and let it idle for about 10 mins, and it got to about 230 degrees, so i turned it off and it went up to about 242 and we left the fans on to cool it down.

So, I am wondering what we can do to get it so it wont overheat at idle like that, and so that we can drive it on the highway without it overheating. I am going to go get a 3rd fan to put in front of the radiator ouching air in so the other 2 behind it can pull it through.

What do you guys suggest?

Thanks
-Scott

steveo346

iTrader: (18)

i think the airdam in the front is very very crucial....check the relays on the fans to make sure they are working...and check the t-stat to make sure its not stuck

pics of this beast'?????????