,
Although the intake ports are downdraft and flow really well for the volume, Ford CNC ported the head as well. The intake port volume has be set by CNC at 193cc which is pretty small but when you consider the direct shot the intake port has, the volume is reasonable. The port velocity should be excellent.
The exhaust ports have also been CNC ported. Like the intake ports, the exhaust ports have an inherently good design.
You can see the tool path from the 5 axis CNC machine in the port here! The Boss 302R heads flow 4% more on the intake and 10% more on the exhaust side of the engine.
We used a Cobra Jet exhaust cam and a Boss 302R intake cam to produce the combination of the biggest cams Ford makes. The Cobrajet exhaust cam has 290 degrees of duration and 13mm of lift vs the stock 11mm of lift and 263 degrees of duration. The intake cam has 13mm of lift and 263 degrees of duration, up from 11mm of lift and 260 degrees of duration from stock.
The aftermarket cams for the Coyote seem to have near stock lift and more duration which necessitates the use of VTC limiters so the cams won’t cause the valves to hit on overlap. We would rather have higher lift and shorter duration to allow us to take advantage of the full command authority of the variable cam timing system.
We ordered Ford Racing’s head changing kit which comes with positive sealing multi layered steel head gaskets and high strength head bolts. Factory parts kick ass, especially when daily driving durability is required.
