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This manifold is designed to be used with high performance rectangular port heads. This manifold is part of the Weiand Nostalgia Series of intake manifolds. Weiand Nostalgia Series intake manifolds are made using the original tooling, and may have minor appearance imperfections that do not affect the functionality of the part. These minor blemishes are a natural part of the casting process when using the original sand casting tooling. Weiand Nostalgia series intakes are proudly cast and machined in the USA. We support all areas of the vintage, show, and nostalgia car hobby, and want to continue to produce these lower volume manifolds using the original tools. There is no need to search for that vintage intake at swap meets or on the internet when you can buy the real deal new from Weiand! If you are not satisfied with a Nostalgia Series intake, we will gladly exchange it or refund your money. Our tech service representatives can be reached at 1-866-464-6553. Features: High Rise/Dual Plane Design 4150 Style Square Bore Mounting Flange Machined for Standard Deck Blocks Power band: Idle-6800 RPM Height: Front 4.75", Rear 5.75" Port Size: 2.30” height 1.59" width Weiand Nostalgia Series Intake Manifold