7.4 Vortec coolant leak
Last night drove to my RV parking lot and saw 2 leaky spots on the asphalt under the rv. Spot number one is in front of engine and spot number 2 is right under the torque converter. I have put a bu...
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The 5.7 Vortec were prone to leaking from the coolant passages between the lower intake manifold and the heads. Cause was reduced number of bolts that held the intake to the head (not the fact that it is DexCool). I had a small block so I'm familiar with them, I never got real familiar with the 454 since I didn't have one.
The remedy was to replace the intake manifold gaskets and use an RTV called 'The Right Stuff' or 'The Good Stuff', I can't remember which. It is a black sealant in a pressurized can. Can be bought at Autozone/Oriellys and similar places.
I had the leak on my '97 GMC. I had to replace a head at 207k mi and the above is what I used. My leak had never returned at 244k when I sold the truck.
The remedy was to replace the intake manifold gaskets and use an RTV called 'The Right Stuff' or 'The Good Stuff', I can't remember which. It is a black sealant in a pressurized can. Can be bought at Autozone/Oriellys and similar places.
I had the leak on my '97 GMC. I had to replace a head at 207k mi and the above is what I used. My leak had never returned at 244k when I sold the truck.
