Trans-Dapt Aluminum Water Neck - O-Ring Style 90 Degree Swivel 355013 When tightened the "O" ring

When tightened the "O" ring is compressed

75 in Bores

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and oil temperature with 3-3/8" remote recall tachometer (5" tachometer version shown for reference only)

Trans-Dapt Aluminum Water Neck - O-Ring Style 90 Degree Swivel 355013 When tightened the "O" ringTrans Dapt Performance 90 Deg. Swivel Style Water Neck, (O Ring Seal), SB and BB Chevy V8 Polished Aluminum Trans Dapt Performance Products Aluminum water necks are available with four different neck angles to meet virtually any configuration requirement. The polished aluminum construction looks superb, and is easy to maintain. The O ring design ensures the best possible, leak free seal. Available for early and late model SB Chevy applications.