Fits 1959-1980 Chrysler 383-440 B/RB Big Block. Square Ports, 1.78 Inch x 1.48 Inch
- Has A Steel Core With Graphite Facing
- Graphite Facing Has Excellent Thermo-conductivity
- Coated With High Temp Silicone For Sealing
- Will Not (brindle ) Or Indent Aluminum Heads
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