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 Post subject: back cut valves?
PostPosted: Sun Dec 24, 2017 7:24 am 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1387
Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
Does anyone know if new, stock sized valves, are available back cut? Or should I just have the machine shop back cut my current valves?

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 Post subject: Re: back cut valves?
PostPosted: Sun Dec 24, 2017 8:13 am 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
Mopar Performance had back cut stock valves decades ago, but are now in the dust bin of history. If I were doing a budget head and couldn't afford the bill for 12 valves and machining I would use new stock exhaust valves and a larger intake valve. New 318 valve springs will work for mild cams.

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 Post subject: Re: back cut valves?
PostPosted: Sun Dec 24, 2017 10:04 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 16448
Location: Blacksburg, VA
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I agree with Josh. If at all possible, get the 1.70 intakes at least if you are not big on cash. Is no one making the 1.70/1.44 valves inexpensively now?

Lou

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 Post subject: Re: back cut valves?
PostPosted: Sun Dec 24, 2017 11:25 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
www.sivalves.com/ is the only source I'm aware of for the 1.70", 1.44" valves.

The exhaust side flows well enough with a little detailing. The intake side needs the most help and hogging out the intake side for a bigger valve is cheaper than doing the same to the exhaust side with a new hard valve seat.

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 Post subject: Re: back cut valves?
PostPosted: Mon Dec 25, 2017 5:42 am 
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Joined: Wed Oct 23, 2002 7:57 pm
Posts: 8283
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Quote:
Is no one making the 1.70/1.44 valves inexpensively now?


The SI ones I got last year were less than $10 each.

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 Post subject: Re: back cut valves?
PostPosted: Mon Dec 25, 2017 10:26 am 
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TBI Slant 6
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Joined: Sun Aug 14, 2016 5:52 pm
Posts: 171
Location: SW Washington
Car Model: 66 Valiant, 82 D150, 94 Ram 2500 TCD, 69 Dart
I had my head machined and rebuilt last year. The valves were less than 5 bucks each, I believe they are Ferrea's, 1.68 intake and 1.44 exhaust. If you need the details I can check with the machine shop after the holidays.


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 Post subject: Re: back cut valves?
PostPosted: Mon Dec 25, 2017 11:55 am 
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Joined: Wed Oct 23, 2002 7:57 pm
Posts: 8283
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Yes that would be good info to have. They may have a slightly larger intake available also?

Rick

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 Post subject: Re: back cut valves?
PostPosted: Tue Dec 26, 2017 6:28 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 14117
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
I think one of my heads has 1.71 Ferreas in it. As far as back cutting, it's part of any real good valve job. It's just an ectra zngle that narrows the seat width on the valve.

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