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To get the intake ports as large as they are, the Indy heads have extra material around the intake ports that push stock intakes up. Note in the photo above, there is a gap between the block and the Edelbrock Performer RPM intake. The photo on the right is the Indy 401-3 single-plane intake. To use the Hogan's tunnel-ram, Mike from JMS built a spacer to fill the gap.