nut size for 330 manifold studs
nut size for 330 manifold studs
I'm missing a couple of the nuts for attaching the Webbers to the 330 manifold studs.
I've tried ever pitch of Whitworth, SAE, & metric.
What size & pitch are these?
I've tried ever pitch of Whitworth, SAE, & metric.
What size & pitch are these?
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Re: nut size for 330 manifold studs
Gi 330 4HL: Very nice engine detailing. If you are into diy Ferrari service, a great investment is a metric thread pitch guide. They are not expensive and will keep you from choosing the wrong nut, screw, bolt or stud. They are a series of small blades much like a feeler guage with each of the different pitches cut in the individual blades so you can see if they match a chosen fastener. I do not know the size or pitch, but suspect it is something like a 8mm 1.0 pitch. Bob
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Re: nut size for 330 manifold studs
Please tell me if/when you find them. I have searched for these to no avail. If yours are like the earlier cars' the hex is 12mm, very hard to find. I located these nuts in 1.25 pitch but not 1.0.
john
john
PF Coupe
Re: nut size for 330 manifold studs
I just measured the nuts on my 40DCL carbs and they are 8mmx1.0 with a 11mm hex. I do not see why you could not take a 1/4-20 nut and tap it to a 8x1.0. The 1/4-20 should have a 7/16 hex which is almost the same as 11mm. 7/16 = 11.1 mm
Re: nut size for 330 manifold studs
I believe Neil at Newco products has these under his hardware section of his website.
Cory
Cory
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Re: nut size for 330 manifold studs
I'm almost certain that these are M8 X 1.00, meaning the ID is 8mm, fine thread. These are so easy to lose that I bought a bunch, but will be the first to admit that they may not have the "correct" finish, nor am I sure of the OD, but I think it takes a 13mm wrench. (don't hold my feet to the fire on that one, unless I have my nomex Lucchese boots on). Here's a place from Amazon that has them, cheap. steve
http://www.amazon.com/Thread-Finished-M ... X+1.00+nut
http://www.amazon.com/Thread-Finished-M ... X+1.00+nut
steve meltzer,
"I've spent all of my money on wine, a beautiful woman, and stunning cars. Then, squandered the rest."
"I've spent all of my money on wine, a beautiful woman, and stunning cars. Then, squandered the rest."
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- Posts: 989
- Joined: Mon Sep 06, 2004 10:31 am
- Location: with Barney the Beagle boy and Enzo 8995
Re: nut size for 330 manifold studs
Just back from checking the nuts that bolt the carbs to the intake on my GTC. As noted, they're M8 X 1.00 (where 1.00 is the pitch in mm). The nuts on my car are 14mm in OD, but I have some 13mm OD ones as well in my box of these. steve
steve meltzer,
"I've spent all of my money on wine, a beautiful woman, and stunning cars. Then, squandered the rest."
"I've spent all of my money on wine, a beautiful woman, and stunning cars. Then, squandered the rest."
Re: nut size for 330 manifold studs
thanks all, I've got some shopping to do!
rick
rick
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- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: nut size for 330 manifold studs
I called Newco, he has these nuts. He is adamant that the correct nuts are not 12mm but 12.5mm in width and you need a special wrench for them. I went home and measured mine with calipers, all but one measured 11.95mm. I wonder what other 250GT owners have on their cars, 12mm or 12.5mm. Thanks.
john
john
PF Coupe
Re: nut size for 330 manifold studs
John: They are 12 mm hexes.
Re: nut size for 330 manifold studs
John: Need to clarify a little bit. Most cars will have 12mm hexes. However, I have seen 11mm hex on some earlier cars. These are getting pretty thin on wall thickness, so they went to 12mm for better strength. 38 DCN installations will have 11mm hex nuts.