NEW!, NO STRIPPED THREADS, clean, no oil, carbon or old gasket residue, RETURNS ACCEPTED! 

Tuned Port Injected engines with Vortec heads is a reality thanks to this Highflow Vortec base Engine dynometer tests have shown a 40HP gain with this Vortec TPI base plate and stock Vortec heads versus the stock L98 engine. The Vortec TPI base manifold was designed from the original GM TPI intake to be a universal fit for Chevrolet/Pontiac cars 1985-1992 that were equipped with factory Tuned Port Fuel-Injection and the cylinder heads have been replaced with the new style raised-port improved flowing Vortec heads

In house testing has proved a gain of 40 horsepower over a stock L98 engine. The larger runners of the TPI Vortec Baseplate combined with the excellent flow characteristics of the GM Vortec heads produced 300 hp on an otherwise stock L98 engine. Other modifications such as camshafts, rocker arms and injectors produced as much as 375hp with the stock computer and throttle body.