The Edelbrock Victor Jr. Holden is compatible with competition 355+ c.i.d. Holden V8 engines that utilize the 1988-98 Holden VN cylinder heads. The Victor Jr. Holden is a single-plane design that is tuned for maximum air flow from 3500 to 7500 rpm. It features a taller design with long tapered runners for a broad operating rpm range. Will fit both stock 1988-1998 EFI style cylinder heads and the Edelbrock Holden VN RPM cylinder heads. It also features a 4150 flange compatible with square-bore s and throttle bodies. Includes extra material for porters to modify compatible with 4500 series applications. The water outlet is machined compatible with a small-block Chevy waterneck. Recommendations: OEM 4-bbl. Edelbrock Thunder Series AVS or Performer Series Carburetor