12" x 2" Oval Plain Polished Aluminum Air Cleaner Kit Convert any one-piece GM TH400

Convert any one-piece GM TH400 case into a two-piece case with our Speedmaster TH400 case adapter

Designed for precision fitment and easy installation

This body has a much larger diameter then your existing throttle body

1966-72 (1973 non-CA) passenger cars

Bolts directly to torqueflite converters

12" x 2" Oval Plain Polished Aluminum Air Cleaner Kit Convert any one-piece GM TH400Speedmaster's air cleaners not only look great, they also provide your engine with cleaner air for better performance. They're available in round and oval styles, and you can choose between plain polished, straight ball milled, and flame ball milled finishes.