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EFV-8 Club Forum / General Ford Discussion / holley power valve thread size

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Discussion Topic: holley power valve thread size -- page: 1 2

parrish

06-29-2011 @ 7:42 AM

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Thanks. Wish I knew a super mechanic...

ken ct.

06-28-2011 @ 5:34 PM

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Carbs with a nut under the top screws look like cr*p. Tap them OS to 12x24x5/8. Head is just a tad bigger and not even noticable.ken ct.Course your super mechanic should know all this.

parrish

06-21-2011 @ 9:43 PM

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Ken: You are indeed correct that it is the top to body screws that are 10-32, not the body to base. As I thought about it, the 10-32 fix from years ago was to use 6-32 screws with nut partially ground to fit the (1) front and (2) side thread positions which are tight to the body section. I decided to re-visit that method today with the aforementioned carb and it worked like a charm...nice and tight. As for the economizer/power threads, I'll give Strokers Loctite 442-28654 a whirl just for experimentation...

parrish

06-21-2011 @ 9:41 PM

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supereal

06-21-2011 @ 10:32 AM

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There probably is little harm in trying repair stripped threads in a carb, but if any of those fasteners let go, there is a possibility of a fuel spill on a hot engine, leading to a destructive fire. Stripped threads are almost always a sign that an amateur tried to reassemble a carb and got heavy handed in the process, so there may be other problems, such as damaged idle needle seats, etc. We are seeing new repro carbs on the market, fitted with modern components. Not cheap, but better than a worn out original, both in performance and safety.

ken ct.

06-21-2011 @ 12:37 AM

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Sorry Parrish but,threads on body to CI base are 12x24 [2] and [1] 1/4x28,top to middle are 10x32. FYI. ken ct.Forget about fixing the PV threads its a waste of time.Deep six it.

parrish

06-20-2011 @ 11:34 AM

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As I recall, the threads on the body to base are 10-32 and years ago I would grind down one side of a nut and use it to gain some traction. It won't save the Titanic, but it is better than a freely turning screw...

parrish

06-20-2011 @ 8:14 AM

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Economizer thread issues must be fairly common as the intruction kit carries this warning: "use care when tightening"

oldford2

06-20-2011 @ 3:17 AM

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Ken, Have you ever seen the threaded holes that hold the carb sections together stripped? This might work to repair them. John

ken ct.

06-19-2011 @ 11:29 PM

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John,In 25 yrs of rebuilding 94,s i have NEVER seen or heard of stripped thread on a PV in one.I for one wouldn't try it. OMO.What say you guys,Charlie,ny,Henry 52,Strom 81,have you ever seen one.??? ken ct.

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