Exhaust Stud Size?

[Jozseph]

Would anyone know the size of the exhaust manifold STUD, [for Exhaust Pipe flange]

It is GM part Number 14022654 / NSN 5307011518374

No longer available from GM Dealer.

Thank You

Joseph

 

[GM72K10]

3/8"

Characteristics Data of NSN 5307011518374

MRC	Criteria	Characteristic
AAJD	THREAD CLASS	2A NUT THREAD
AAJF	THREAD DIRECTION	RIGHT-HAND STUD THREAD
AASA	THREAD LENGTH	21.1 MILLIMETERS NOMINAL NUT THREAD
CQJX	NOMINAL THREAD SIZE	0.375 INCHES NUT THREAD
CQQR	THREAD PITCH IN MILLIMETERS	1.50 STUD THREAD
FEAT	SPECIAL FEATURES	RADIUS ROOT THREAD
MDCL	MATERIAL DOCUMENT AND CLASSIFICATION	SAE ASSN STD ALL MATERIAL RESPONSES
THSD	THREAD SERIES DESIGNATOR	UNC NUT THREAD
AAJF	THREAD DIRECTION	RIGHT-HAND NUT THREAD
AASA	THREAD LENGTH	13.5 MILLIMETERS NOMINAL STUD THREAD
ABHP	OVERALL LENGTH	71.5 MILLIMETERS NOMINAL
CQJX	NOMINAL THREAD SIZE	10.0 MILLIMETERS STUD THREAD
CTTC	THREAD TOLERANCE CLASS	6G EXTERNAL STUD THREAD
MATT	MATERIAL	STEEL COMP 1035 OR STEEL COMP 1038
THSD	THREAD SERIES DESIGNATOR	M STUD THREAD

 

[cucvrus]

I agree on the 3/8" stud size on the exhaust side. But are they 3/8" where they thread into the exhaust manifold? I think that may be a M10 1.5 on the manifold side. Stranger things have happened back in these old trucks. 1/2 metric and the other 1/2 standard. Just asking. I never had to replace any studs on CUCV's but I did on a few other vehicles of the same vintage and ran into this. Clear the air if you know.

 

[gringeltaube]

I can confirm the dimensions listed in post #2: longer threaded end (nut) is 3/8"-16; shorter end is M10×1.5



G.

 

[Jozseph]

FWIW hunting for new studs, I located a new GM part number for the same GM part.

GM Part Number 12337861 same as old part 14022654

I ordered 6 studs today