Perforated Steel
Composite
OE Style with Oval Exhaust Ports
Multi-Layered Steel
with Square Ports
Composite
with Square Ports
Round Port Shape; Port Diameter 1.50 in.
Round Port Shape; Port Diameter 1.63 in.
Square Port Shape; Port Dimensions W-1.45 in. x H-1.55 in.; Medium Square Race Port
Square Port Shape; Port Dimensions W-1.85 in. x H-1.90 in.
Square Port Shape; Port Dimensions W-1.45 in. x H-1.48 in.; Small Square Race Port
Square Port Shape; Port Dimensions W-1.85 in. x H-1.90 in.
Browse our selection of quality exhaust manifold gasket set parts designed specifically for your GMC C3500HD. We carry options across multiple trim levels, body styles, and engine configurations to ensure a perfect fit.