Alot of people miss, with the LS engine, two things you shouldn't do:
1. dont loop the heater core lines. Tap, and Plug them. This accounts for some overheating issues sometimes.
2. Dont tap the water pump for steam port lines. the steam port, 4-corner unit, needs to run to the upper radiator hose or tank (I put mine in the tank).
3. never block rear steam port lines in an engine swap.[/QUOTE]
Curious why you feel the rear steam vent lines cannot be blocked.
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