N15 Carb mounting hardware?

Hi
When Norton switched to the concentric carb on the N15CS 750, what mounting fasteners were used?
A combination of studs and aliens?
Does anyone have the part numbers?

Thanks

Mark

Mine has Concentrics and it uses longish studs bolted to the head the alloy spacers slip over the studs then the carbs and then nuts and washers. I seem to remember I ordered a set of studs and nuts from Norvil as one or two were missing and the rest a bit scruffy.

Three studs (and nuts) and one internal allen (you cannot screw two internal studs).
Same for Atlas/P11.
Andover supply, i bought from them, you can ask.
Ciao
Piero

It may not be stock but..
I have 3 featherbeds with concentrics.
on the outside I used 2 stud 23563/06-7592 /nuts nme3231/06-7592 /washer nm11796 and inside two allens 23395 & washer. different layout for monoblocs ... again different for 1966 389/689

Both Norvil and ANIL studs had to be reworked to fit and match an OEM norton 23563(from a manxman)
allens from both were OK

According to my parts book, carb mounting would require:
1 - 030343 -screw
3 - 21999 - stud
3 - E.3231 - nut
4 - 11796 - washer

These are for the thin intake spacer (p/n 030561). Different screw and studs for the Atlas through 1966 and the 650SS - longer to go with the thick spacer (23872)
23395 - screw
23563 - stud

Both set-ups call for p/n 23358, which is called a thin spacer. This same part # is in the Commando manual, NM23358, and called carburettor heat insulator. p/n changes to an 06-3458 for 32mm carbs

thank you everyone for the replies.
The 03-0343 screw is still a good number at Walridge but not at Andover Norton. DD's number of 23395 is a good AN number for internal hex stud.
The rest are good AN and Walridge numbers.
E.3231 nut, is now 06-7592
2199 stud = 06-7792
11796 washer = 06-7622

I am at a bit of loss here? And apologize for sliding off topic to featherbed.
Is there thick and thin insulators?
AND
thick/long and thin/short manifolds.
All my manifolds are 1" except for the 68 dunstall which are hot rod 1-1/2" finned pieces (long).
My 66 389/689carbs are short manifolds 1".
Am I wrong the short 1" manifolds are for long MONOBLOC
And long manifolds 1-1/2" are for short concentrics?
This keeps the air cleaners in the approx same position....

My G15CS and 750 Ranger are both Amal concentric bikes.

They both have the 23358 spacers - called heat insulater in later manuals - 1/8" thick
They both have the 030561 spacers - which is the aluminum one with the balance pipe nipple screwed in - 1/2" thick

My G15 has the wedge-shaped air cleaner as I've seen on the Atlas, except the center of the mesh area is pushed in slightly to clear the AMC frame single main tube.

BillT said:

My G15CS and 750 Ranger are both Amal concentric bikes.

They both have the 23358 spacers - called heat insulater in later manuals - 1/8" thick
They both have the 030561 spacers - which is the aluminum one with the balance pipe nipple screwed in - 1/2" thick

My G15 has the wedge-shaped air cleaner as I've seen on the Atlas, except the center of the mesh area is pushed in slightly to clear the AMC frame single main tube.

Click to expand...

Bill
I think it's coming clearer.
All use the insulator, and I knew that...
None of mine have the 1/2" manifold.
All mine are 1" manifolds and use the corresponding length hardware, though the numbers and positions varies by type of carb. No problem there.
Then I'll accept there was not ever a factory 1-1/2" manifold and mounting hardware. No problem there either. I am just trying to verify that tidbit. I am studying and building a few engines a faux 62 88SS, 63 650SS, 63 atlas, 65 atlas/combat tune/hot rod, 66 atlas, 68 Dunstall atlas. It is easy to accept that Dunstall did what he wanted by changing to hot rod components/long manifold.The 68 Dunstall was the only one originally with concentrics so I had no norton original late model hardware to study
Thanks for helping to clear that up for me.
Dave

This N15CS originally had Monobloc's and used the 1/2 aluminum thin spacers p/n 030561, with the balance unions. So these stayed the same regardless of type of carb installed on the N15's.

Side note:
Bill, I ran the number 23358 on the ANIL site, shows a fibre spacer and listed as 30mm for intake bore. Other numbers were not found.

I looked in my book Norton Spare Parts list 1963- 1965 Models 88, 650SS, 650/99, & Atlas, it lists in the Carburetter section,
23358 - spacer carb - thin qty 2 ALL so this would be fibre
23872 - spacer - carb - thick qty 2 88ss, 650 and Atlas, material unknown at this time. Most likely fibre. In the section for 1966-1967, 1968 this spacer is call out for 650SS, Atlas 1966
030561 - spacer carb - ALL G15 aluminum 1/2" thick. Balance unions installed on this part.

My 1965 Atlas which has retrofitted concentrics, has a 1" aluminum spacer with balance unions, and a thin fibre spacer. Wonder what this thick aluminum p/n is?

No question in my mind Bill and I agree and what is correct is:
Atlas through 1966 and the 650SS - longer to go with the thick spacer (23872) ( I add 23872 is the 1" manifold)
23395 - screw
23563 - stud
The 23358 insulator is used on all downdraft NHT until combat where it grew to 32mm

1. FWIW ANIL is not correct...the original parts are 28.5mm not 30. What ANIL wants to call them or produce is another matter.

2. The use of the term and meaning of "spacer" in the IPL is inconsistent with what the hardware actually is. That is the whole basis for the confusion!