ls1tech.fan

iTrader: (6)

I'm replacing the cat (passenger side) and need to replace one of the bolts (stripped where the nut comes off). Bolt is out, exhaust manifold does not seem stripped, so . .

What is the part #?
or What is the bolt size so I can replace it with something generic?

and the nut size?

Darkman

iTrader: (2)

http://www.dormanproducts.com/p-28717-675-567.aspx

Darkman

iTrader: (2)

My mistake- should be:

http://www.dormanproducts.com/p-20397-675-575.aspx
"A" Thread Size: M10-1.50
"A" Thread Length: 27mm
"B" Thread Size: M10-1.50
"B" Thread Length: 12mm
Shoulder Length: 13mm
Overall Length: 52mm
Brand: Dorman - AutoGrade - Boxed

ls1tech.fan

iTrader: (6)

The first one looks right (the other one has too large of a dead space in between)
This is for a 2000 LS1 Firebird

nolo200

iTrader: (3)

....or you can use M10 socket cap screws available pretty much anywhere.

ss2668

iTrader: (21)

The stud part # is 10220453
The nut part # is 11517996 which is (M10 x 1.5)

Darkman

iTrader: (2)

The dead space is larger than the OEM part, but works just fine.

ls1tech.fan

iTrader: (6)

By any chance if I find it is stripped, this one I can reach behind the exit hole and just put a stud with 2 nuts on each side. Any downside to this?

Darkman

iTrader: (2)

I may not understand your question correctly but if you are asking whether the stud has to be threaded into the exhaust manifold the anwer is "not necessarily."

That is to say - you could simply put bolt (or stud with a nut) through the hole in the exhaust mainfold the hole in the cat flange and secure it with another nut. The only potential pitfall might be whether there is clearance on the exhaust manifold side to accomodate a bolt head or nut. You might also want to drill out the stripped threads to accomodate a full size bolt or stud.

ls1tech.fan

iTrader: (6)

Thanks for the info (exactly what I'm talking about)
What do you mean by full size bolt? using a smaller diameter one would cause issue (not up to strength)?

Darkman

iTrader: (2)

Yes, I am just saying that the OEM bolt a 10mm which is larger (and stronger) than whatever bolt you would have to use to fit inside the stripped threads. On the other hand, this is just exhaust plumbing....

SF 1HOTLS1

iTrader: (24)

the correct bolt size is not a 1.50. the correct size is a M8-1.25 X 25MM OR 20MM. I see a lot of people saying on here its 1.50. im just tryna clear things up. that size can be bought at OSH in a flange style bolt and works great.

Joshua Norman

10 mm

G Atsma

I bet he found that out within the past 12 years since he posted about it....