Opening of Ports of the Intake Manifold, and, of the Intake Ports on the Head...the openings ( where the 'Ring' would go ) are 1-1/2 inch in diameter.
The horizontal alignment of Manifold to Head when the Exhaust Manifold is in proper position( as far as the Intake Ports lining up ) the Intake Manifold is just about 1/4 inch too low.
The old Rings were horribly distorted into whatever the round version is of a 'parallelogram'.
