Adding a carburetor spacer changes the stud length required to keep full thread engagement in the intake manifold, and short factory bolts are the most common cause of a spacer install that weeps fuel or pulls loose. These 2.5 in. studs cover a 0.500 in. thick carburetor flange stacked with a 1 in. spacer or a pair of 0.500 in. spacers. The 12-point nuts keep socket access open next to the fuel bowls where a standard hex nut usually will not clear.

Moroso 37963 Technical Specifications:

• Stud size is 5/16-24 x 2.5 in. overall, four per kit.
• Designed for a 0.500 in. carburetor flange plus roughly 1 in. of spacer height.
• Bullet nose stud ends let the nuts start straight without cross-threading.
• 12-point nuts reduce the across-flats dimension for wrench clearance in tight engine bays.
• Hardened flat washers and black oxide finish included throughout.

Note: verify thread engagement in the manifold before final torque, and confirm the throttle linkage still clears once the spacer height is added.