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Building A High Performance Boss Mustang 409 Engine - Big Boss Buildup



Boss 409 Engine Build Heads
Chambers side-by-side are clearly different. The old-tech Cleveland wedge chambers (top) were the hot ticket in 1970, but not anymore if you want real power from your Cleveland or Windsor. Smaller, heart-shaped, high-quench chambers yield more power on light-off without pinging and opposing flame fronts. Look around the valves of the 351C-4V head and the MPG 3V. The 3V has less valve shrouding, which improves flow.		 Boss 409 Engine Build Exhaust Ports
On the exhaust side, 3V ports are smaller than the 4V, which also improves torque depending upon valve overlap. We're learning via Scott and MPG Head Service that port size isn't as critical as port geometry.]		 Boss 409 Engine Build Ford Racing Intake Manifold
When Scott was considering the induction system, he decided to go with what he trusted most-the Ford Racing PN M-9424-B302 Roush single-plane manifold that was filled and ported on the intake side only per Engine Masters rules...
Boss 409 Engine Build Ford Racing Intake Manifold
...Scott says he had a devil of a time finding this manifold and had to pay through the nose to get it.		 Boss 409 Engine Build Demon Carburetor
Fine-tuning the 409 was straightforward because Barry Grant's removable sleeve Race Demon makes it easy to dial in flow. This is the Race Demon with 975-cfm sleeves.		 Boss 409 Engine Build Carburetor Spacer
The 1-inch Super Sucker aluminum carb spacer from MPG Head Service has a funny name, but it gives stellar performance....
Boss 409 Engine Build Carburetor Spacer
This clever design improves flow between the carburetor and plenum by keeping fuel droplets in proper suspension, mixed properly with airflow. MPG took this to the Engine Masters Challenge and claims a 47-horse increase on naturally aspirated engines.		 Boss 409 Engine Build Windage Tray
MPG opted for this electric water pump from CSI Performance Products. An electric water pump doesn't consume the engine's rotary motion. It also yields reverse flow cooling, which pulls more heat out of a hot engine. The automakers have gone more to reverse flow cooling with good results.		 Boss 409 Engine Build Oil Drain Plugs
Oil drainback is another power-robbing issue because it drains back all over the crankshaft. MPG restricts oil return to the front and back of the block by plugging oil-drain holes at the block's center.
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