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A backwater valve (sometimes called a backflow or sewer backup valve) is a valve you can install on your sewer line and is designed to allow water or sewage to flow only one way that is out of your house Anytime there is a sudden heavy rainfall the city sewer lines can become overwhelmed causing water or sewage to flow back towards your home.
Back cutting valves for more flow why? YouTube
108″ Exhaust Valve (back cut) – Dynamic Engine Development LLC 108″ Exhaust Valve (back cut) $1600 Add to cart Description Replacement exhaust valve for our SBH big valve cylinder head 1080″ diameter Stainless steel Backcut for better airflow.
1.350 Intake Valve (back cut) – Dynamic Engine Development LLC
1350 Intake Valve (back cut) – Dynamic Engine Development LLC 1350 Intake Valve (back cut) $1700 Add to cart Description Replacement intake valve for our SBH big valve cylinder head 1350″ diameter Stainless steel Backcut for better airflow.
Back Cut Valves KMSUHPVJBCV King Motorsports Unlimited
In a majority of the heads we tested we found the gains with a 30degree back cut were greatest at the lower lift values between 0100 and 0300 inch At first this may seem of marginal value especially if your camshaft is capable of valve lifts of 0500 inch or more.
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Back cutting valves involves removing material from the back side of the valve head Back cutting valves involves removing material from the back side of the valve head This allows air to flow around past the valve and into/out of the chamber faster In addition this also lightens the valve.