This new Pro-Flo XT intake is engineered for high performance 396-502 c.i.d. Chevy V8s with large oval-port heads. A large plenum and tapered runners deliver maximum horsepower and broad torque throughout the rmp range. This manifold made 25 more horsepower than our number 35500 Pro-Flo 2 single plane manifold. It features a 90mm throttle body opening for maximum performance. Choice of satin aluminum or black powder coated finish.