Seals-It Firewall Grommet 2-Hole 5.250 x 1.50 O.D. Blank ProTru by Wiseco C4-R4 Valve

C4-R4 Valve

#4241 wont fit 1991 and later big-block Gen V & VI engines

Large-diameter 3-1/2" gauge face indicates percentage of leakage rather than psi

Cadillac V8 1956-57

Increased high speed performance and minimizes water pump cavitation

Seals-It Firewall Grommet 2-Hole 5.250 x 1.50 O.D. Blank ProTru by Wiseco C4-R4 ValveProduct Description: Firewall Grommet Blank 5. 250 x 3 in Aluminum Rubber Black Sold Individually From asphalt and dirt track racers Seals It rod end seals get the job done. In business for over 25 years, Seals It manufactures seals, grommets, and other automotive products for many industries including NASCAR, motorsports, and 4x4 off road vehicles, as well as agricultural, aerospace, transportation, and other applications.