Need thread pitch / spec / dimensions... - ZR-1 Net Registry Forums

Schrade · 05-30-2013

The speed shop called today; they need "thread pitch" for the Air Inlet fitting (to the exhaust manifold???).

I'm not 100% sure of the hardware configuration, since they've had the car for most of the year that I owned it - I know only what he described. I told him I'd go through the FSM to see what I could find.

Anyone already familiar with what they're describing, that they need?

Blue Flame Restorations · 05-30-2013

Contact Jerry's Gaskets. Jerry will know.

Schrade · 05-30-2013

Will do Brett; thanks there...

Jagdpanzer · 05-30-2013

Please point it out:

http://jerrysgaskets.com/store2/root..._image&pID=378

Schrade · 05-31-2013

I'm presuming here, jagdpanzer, that he needs the thread pitch of the encircled fittings:

Why, I don't know, but I'm off to get up there in the AM here.

Where's Jerry here? Know the thread dimensions???

mike100 · 05-31-2013

I think it is 3/4" and the thread pitch is 14NC. I just repaired an air tube fitting and i got a bushing with the same external thread.

Interesting to note that many of the small block applications one-way air injection check valves are one size smaller.
The 63-504 fit on my repair: http://www.downwindmarine.com/Pipe-R...-90891187.html (note dimensions are for inside diameter and threads- the outside is 3/4's)

Schrade · 05-31-2013

Quote:

Originally Posted by mike100

I think it is 3/4" and the thread pitch is 14NC. I just repaired an air tube fitting and i got a bushing with the same external thread.

Interesting to note that many of the small block applications one-way air injection check valves are one size smaller.
The 63-504 fit on my repair: http://www.downwindmarine.com/Pipe-R...-90891187.html

Thanks there Sir..................................

WVZR-1 · 05-31-2013

Quote:

Originally Posted by Schrade

I'm presuming here, jagdpanzer, that he needs the thread pitch of the encircled fittings:

Why, I don't know, but I'm off to get up there in the AM here.

Where's Jerry here? Know the thread dimensions???

In that image the threads are 1/2" - NPT which when measured externally is a dimension something near .830 or so. !/2" NPT is 14 TPI as is 3/4 NPT but 3/4NPT is a dimension greater than 1" when measured externally. NPT is based on the internal diameter of the pipe. The bushings that "mike100" references to are NPT also and the reference to a 14NC is not correct, it's 14 but it's NPT. The image is that of a later manifold but I believe the AIR check valves are the same all years.

1/2" NPT 14 TPI

Jagdpanzer · 05-31-2013

I have to agree with Dave, 1/2" npt tapered pipe thread
When I get home this evening I will dig out one of my old exhaust manifolds and confirm.

mike100 · 05-31-2013

yeah, I guess the 1/2" refers to the ID of the bushing...I just recall finding some parts in the plumbing section of a good hardware store here. I was going to hack off some fitting from the junkyard, but the LT5 air injection is double tubed and uses much larger check valves (thread-wise) than most of the small block cars.

At any rate, the link above for the part I mentioned is the correct thread.

05-30-2013	#1
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Need thread pitch / spec / dimensions... The speed shop called today; they need "thread pitch" for the Air Inlet fitting (to the exhaust manifold???). I'm not 100% sure of the hardware configuration, since they've had the car for most of the year that I owned it - I know only what he described. I told him I'd go through the FSM to see what I could find. Anyone already familiar with what they're describing, that they need? __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-30-2013	#2
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	Re: Need thread pitch / spec / dimensions... Contact Jerry's Gaskets. Jerry will know. __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project

05-30-2013	#3
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Need thread pitch / spec / dimensions... Will do Brett; thanks there... __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-30-2013	#4
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,661	Re: Need thread pitch / spec / dimensions... Please point it out: http://jerrysgaskets.com/store2/root..._image&pID=378 __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake Last edited by Jagdpanzer; 05-30-2013 at 11:25 PM.

05-31-2013	#5
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Need thread pitch / spec / dimensions... I'm presuming here, jagdpanzer, that he needs the thread pitch of the encircled fittings: Why, I don't know, but I'm off to get up there in the AM here. Where's Jerry here? Know the thread dimensions??? __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-31-2013	#6
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: Need thread pitch / spec / dimensions... I think it is 3/4" and the thread pitch is 14NC. I just repaired an air tube fitting and i got a bushing with the same external thread. Interesting to note that many of the small block applications one-way air injection check valves are one size smaller. The 63-504 fit on my repair: http://www.downwindmarine.com/Pipe-R...-90891187.html (note dimensions are for inside diameter and threads- the outside is 3/4's) Last edited by mike100; 05-31-2013 at 12:27 AM.