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#37431 04/21/2004 12:31 AM | Joined: Mar 2004 Posts: 96 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2004 Posts: 96 | What are the standard valve face angles? I understand that there are 3 separate angles used, or is that incorrect? Also, someone mentioned to me awhile back, about having those angles modified. Is this a performance gain, and if so, what is gained from doing this?
Whad you do?!?
Shane
1953 Chevrolet 3600
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#37432 04/21/2004 3:43 AM | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | The "face" angle, where the valve actually seats, will be either 45 degrees, or sometimes 30 deg., like on a stovebolt intake valve. The valve seat width is controlled by grinding a 30 degree angle above the seat, and a 60 degree angle below it. On the 30 degree intake, the angles would be 15, 30, and 45. The valve itself usually has only one angle ground on it, but I've ground a relief angle below the seat area on some race engine valves. Unless you're going for high RPM and horsepower, the standard valve grind is adequate for street use.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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#37433 04/21/2004 4:11 AM | Joined: Mar 2004 Posts: 96 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2004 Posts: 96 | Thanks Jerry, The engine in question is my 261. One of the guys on the forum recommended having the angles changed, but I can't seem to find the post and the reasons he cited for this and what it would accomplish. Anyway, thought I would put the question out there. Thanks for the response, the rebuild parts are on the way. Patrick's was very helpful and I ordered most of the stuff from there. I decided to splurge and go for one of the Howard cams! I've read good things about it. 
Whad you do?!?
Shane
1953 Chevrolet 3600
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