Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block. Round Ports, 2.15 Inch
- Has A Graphite Core W/ Steel Outer Layers
- Graphite Core Has Excellent Thermo-conductivity
- Coated With High Temp Silicone For Sealing
- Will Not (brindle ) Or Indent Aluminum Heads
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