Ports measure 2.500" x 1.250", bolts holes are slotted for alignment purposes and racer can finish port the spacers to their cylinder heads if they choose. Great thing about these spacers is they include a valley spacer that the racer can silicone or bolt to the intake to stop the dreaded end seal blow out in the event of a burned piston that causes excess pan pressure pushing out the end gaskets causing the driver to get oil on them if in a front engine dragster or under the back tires if in a rear engine car.
Gaskets and mounting hardware can be purchased separate if the buyer chooses. Spacers are sold in pairs.