Re: Bad erg valve?
Incorrect. The EGR valve is bolted to the intake manifold, and the exhaust gas path flows directly into the intake manifold, using the same holes in the intake runners as the idle air. The LT1 intake manifold is totally "dry" and has no coolant passages at all. No way the exhuast gas could get in the coolant, even if the valve is faulty.
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400+GearVendors OD/4.11's / Strange 12-bolt / 300-shot N2O / Spohn Suspension / 6-pt roll bar with integrated SFC's / full AutoMeter instrumentation / MoTeC M48 Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.