There are four valve reliefs so that the piston can be used on either side. Otherwise, you would need two different pistons for right and left. You couldn't just flip a 2-relief piston over for the opposite side due to the pin offset.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (Ram Air IV w/4” stroke), TKX, 9-inch w/3.70 gears and triangulated 4-link) Pictures
Last edited by tekuhn; 11-01-2021 at 01:54 PM.
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