383RAT

Well, I installed a Dewitts radiator in my Firebird 1 year ago; model 1139006A. This is the two row with 1" tubes for automatic transmissions. The quality of construction appears to be very good. I've had no problems no problems with its cooling ability even when I drove to the top of Pike's Peak.
What about the installation fitment? I ran into 2 issues. They may not affect you. If you still have your AC installed the condenser top rubber holding brackets will need to be trimmed down. At their stock thickness, the Dewitts radiator will not sit back far enough for the top plastic plate bolt holes to line up, no matter how hard pull the radiator towards the front of the car. I had to trim about a 1/4 inch of the 1/2 inch thickness of the rubber brackets. I found this to be an acceptable modification for a much larger radiator. The other issue is more serious. Enough that I sent DeWitts an email about it. There is a radiator hose connection that some Firebirds have while others do not. I had a Firebird without that connection. Dewitts did not make that hose connection removable from their radiators. After more research, I noticed that some other manufacturers make that connection an NPT hole for a pipe plug or a hose barb. I got impatient for a response so I had a friend weld up the end of the hose connection. Dewitts did get back to me about a week later. After some email discussion, they stated that they will be changing the design to an NPT hole on all future built Camaro / Firebird radiators for 3rd gens.

antman89iroc

I've had my Dewitts radiator about 8 months or so and highly recommend it as well. I too had some fitment issues but I run 4th gen fans so that was part of the reason. I run a 5 speed so I didn't have cooling lines to deal with but the temp sensor plugged right in and the hose size/placement was right on. With good fans it does a great job of keeping engine temps under control. I have a 400 based sbc making 420 whp and with a 180stat it runs ~180-190 at all times. I the heart of summer in a drive thru with the AC running it did climb up to ~200 or so. With the stock radiator that would have been closer to 230.

jmd

iTrader: (4)

delco added NPT threads to the passenger side fitting sometime between '99 and '13.

Boom

Bumping this up to see if OP or anyone else has any long term updates on the Dewitt radiators.

Has anyone got them with the fans they offer?

antman89iroc

So going on 2 years for me and no problems. One of the best investments I've made. I still get a little temp climbing during peak summer/AC on in traffic. ~200-210 but most of the time temps run 175-185. I even removed my 3rd pusher fan and it cools better than before.

ShiftyCapone

iTrader: (7)

What part number are you running?