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In this cross section, you can see the bullet-shaped tube for the spark plug and the intake (right) and exhaust (left). Behind the roof of the exhaust port is water, so be careful when porting in this area. Ask us how we know. The 18.0-degree intake and 16.5-degree valve angles help to unshroud the valves on the then-small 3.92-inch bore on the 5.7 engine.