Valve Back Cut
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From: edmonton
Car: 86' camaro
Engine: 305 (currently swapping 454)
Transmission: 700r4(currently swapping th400)
Axle/Gears: stock
Valve Back Cut
so im reading this book on rebuilding the sbc and it says some people grind a 30 degree back cut on thier valves just under the seat contact position to improve flow, is this true?
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Yes.
Pretty common too. You can buy them pre-done, look on summit at valve for an SBC, they'll have "backcut valves".
You can get your machinist to do your stock ones, but if a few are bent or worn on the stems, might as well get a new set that's already done.
I did it by hand, do a search under my name and "home back cut valves" or something, if you're interested.
Pretty common too. You can buy them pre-done, look on summit at valve for an SBC, they'll have "backcut valves".
You can get your machinist to do your stock ones, but if a few are bent or worn on the stems, might as well get a new set that's already done.
I did it by hand, do a search under my name and "home back cut valves" or something, if you're interested.
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backtothe80s
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