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- Item Requires Shipping
- H6.90"
- Ships within 1-2 business days
SKU: 12363407
Same as P/N 12363406, except it has been CNC-port-matched for GM aluminum oval-port heads with large oval-port heads (1975-and-older), and all aluminum heads with oval-ports.
NOTE: Open carburetor spacer is not recommended with use of dual-plane manifolds.
WARNING: Cancer and Reproductive Harm -