401-425 Nailhead Aluminum Intake Manifold TA's intake manifold is the first aluminum single 4 barrel intake available for the 401-425 Nailhead engines! Click here for details Welcome To TA Performance The Ultimate in Buick V6 & V8 High Performance Parts. The Buick Power Providers. Featuring St...
The 1967BuickGran Sportenginehad bigger manifold branches, larger valves, and improved exhaust headers that assured minimumgasflow restriction. Intake valves were 18 percent larger than in 1966 and the exhaust valves were 56 percent larger. There went the old "nailhead." Other innovations included ...
The best part of the package was its upgraded engine, the Nailhead V8. The Nailhead was a 401 cid V8 (officially marketed as a 400) that produced 325 horsepower and a solid 445 lb-ft of torque. It used a four-barrel Rochester or Carter carburetor, five-bolt mains, had a 10.25:1 ...