After doing some research I need some confirmation or denial of my theory. In 1957 all heads had small port heads that used a gasket that is approximately 1.75 x 1.087 on the intake runners. Later cars in 1958 used larger port heads and used a gasket that is approximately 2.0 x 1.275. It is possible that the later 1957 FI heads were large ports, I think but most 1957 heads are small.
Gasket sets with no ID bump and a square bump are small port gaskets. Gaskets with a round or triangle are the large port design.
Let me know your thoughtsIntake Port Size Drawing.jpg
Gasket sets with no ID bump and a square bump are small port gaskets. Gaskets with a round or triangle are the large port design.
Let me know your thoughtsIntake Port Size Drawing.jpg
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