John Kaase Racing Engines has released its latest Boss Nine engine design that features a new intake manifold with a hidden plenum below and stack injection above.
The new stack-injected Boss Nine engine’s hidden plenum helps to equalize the pressures in all induction tracts and provides the engine with a clean, consistent idle, better part-throttle performance and instantaneous throttle response, according to the company. The plenum also provides for brake vacuum and empowers the MAP sensor, which has a major influence in the metering of the fuel.
The Boss Nines are available from 429 to 600 cu and are constructed with either a cast iron or a cast aluminum engine block and topped with Kaase’s hemi cylinder heads. The engines were developed using four intake manifolds. They accept 4150 and 4500-style carburetors, as well as Keith Wilson’s EFI systems and various BDS blower units.
For more information, go to http://www.jonkaaseracingengines.com/.