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Re: Intake Gasket or Head Gasket ? Losing Coolant
He's right, the water jackets are near the outside of the manifold, however the pressure from the water pump combined with the vacuum from the intake could very easily drive the coolant up into the chambers for #4 and #6. Do those compression tests and post up the results. You can isolate it from there.
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1998 GMC Sierra K1500 ECSB, 120K
-5.7L, 3.73's
-K&N FIPK
-MPFI Spider Upgrade
-Doug Thorley Tri-Y Ceramic Headers
-MagnaFlow (2.5")from the headers back
-Tuned by Justin @ BlackBear Performance
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