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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 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 October 1990 - Motor Sport Magazine
https://www.motorsportmagazine.com/archive/article/october-1990/48/valve-angles
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/
A popular trend in many high-end engines is five angles on the cylinder head seat and three angles on the valve—four if you count the margin. Most experts agree that these additional angles on the head are necessary to optimize airflow into the cylinder; therefore, the intake side should never be blended around the seat.
Competition Valve Job Explained – Tombo Racing
https://tomboracing.com/competition-valve-job-explained/
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 degrees. This top angle serves two purposes. First, it acts as a radius to transition air between the 45-degree seat and the combustion chamber.
John Maher Racing » The importance of the 3 angle valve …
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 - 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 …
https://www.enginebuildermag.com/2008/08/the-inside-angle-on-valve-seats-what-you-need-to-know-to-go-with-the-flow/
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. “A few weeks ago, we had three engineers from Harley-Davidson Screaming Eagle Division here for a technical session.
Valve shapes and angles - Don Terrill’s Speed-Talk
https://www.speed-talk.com/forum/viewtopic.php?t=112
For the intake valve, a face cut angle is the way to go, raduis for the exhaust. To reduce reverse, yes keep the backcut .020-.030. I'll try to get Ron Melville to answer the Z-Flow question - he coined the phrase. https://www.speed-talk.com/shows/008_ron_melville.html In Memory of Don Terrill SpeedTalk Owner/Admin Guest Valve 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.
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