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Valve Angle - Make More Horsepower - Car Craft Magazine

    https://www.motortrend.com/how-to/valve-angle/
    Our simple trick that anyone can do is to add a 30-degree back cut to the inside diameter of the 45-degree seat angle on an intake and/or exhaust valve as a way to improve flow. We talked with many...

Valve Angles - Tech Article - Chevy High Performance …

    https://www.motortrend.com/how-to/89678-valve-angles/
    The actual valve-seat angle is generally 45 degrees. On the combustion-chamber side of the 45-degree seat is a top angle that is usually around 30 …

Valve Seats: Will 50- or 55-degree Angles Work For Your …

    https://www.enginelabs.com/features/valve-seats-will-50-55-degree-angles-work-engine/
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Valve Angles October 1990 - Motor Sport Magazine

    https://www.motorsportmagazine.com/archive/article/october-1990/48/valve-angles
    In fact, the Humber’s valve-angle is 90-deg. I think therefore, that the Bentley engine was given this very narrow valve angle simply because, with a single overhead camshaft, rockers were necessary for prodding the valves, and they could be kept decently short if the valves were not too widely inclined.

John Maher Racing » The importance of the 3 angle valve job

    http://johnmaherracing.com/tech-talk/3-angle-valve-job/
    Green line: 3 angle valve job Blue line: 3 angle valve job plus 30° backcut on the valve Overall gain in flow @ .500″ lift: 14cfm. This illustrates how even the mildest of engine builds will benefit from the addition of a decent valve job. On a mild 1776cc engine build, this modification alone could account for an increase of 10bhp or more.

Valve Angles: A Postscript November 1990 - Motor Sport …

    https://www.motorsportmagazine.com/archive/article/november-1990/64/valve-angles-a-postscript
    Anyway, what the patent covered was a cylinder head with valves at a steep included angle, but with their stems pointing inwards instead of outwards, the combustion chamber they occupied being concave instead of convex. It was intended for …

Valve angles - Don Terrill’s Speed-Talk

    https://www.speed-talk.com/forum/viewtopic.php?t=3080
    Valve angle looks to be about 15 degrees (both). Straight round intake ports, but they do transition into a wider floor at the gentle short-turn. It's , I believe" a 72 degree (banks) motor, and even with the narrow banks the intake ports are almost vertical.

The Inside Angle on Valve Seats: What you need to know to go …

    https://www.enginebuildermag.com/2008/08/the-inside-angle-on-valve-seats-what-you-need-to-know-to-go-with-the-flow/
    Mondello says the traditional three-angle valve job is old hat in today’s performance engines. A 30-45-60 degree three angle valve job is still better than a single 45 degree cut on the valve seats, but it can’t come close to what’s possible by optimizing the valve seat profile with additional angles.

The Effects of Chevy Valve Head Angle

    https://inthegaragemedia.com/angling-for-power/
    The alternate valve angles start at 18 degrees and take it as far as 9 degrees for the small-block Chevy! The latest LT1 normally aspirated direct-injection Gen V small-block now sports an amazing 11.75-degree valve angle that is nearly half of the original 23 degrees and includes a valve cant angle of 4 degrees.

Ferrea Helps Explain Valve-flow Dynamics - EngineLabs

    https://www.enginelabs.com/tech-stories/ferrea-helps-explains-valve-flow-dynamics/
    The standard seat angle on the valve is 45 degrees. Some applications like Pro Stock drag racing use up to a 55-degree angle on the valve and the seat. This has been found to increase flow, but it is less durable and it cannot be used in supercharged or turbocharged applications because it can’t take the higher temperatures.

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