turbo manifold stud size?? - SRT Forums

busarich · 03-03-2007, 11:09 PM

Could anybody tell me what size to get for the turbo manifold studs (to mount to the head)? M? X ? also to mount the turbo to the manifold and the o2 housing to the turbo??? Thanks

**Philth** · 03-03-2007, 11:12 PM

Should be the same all the way around. 12x1.25mm...cant remember the last number...I wanna say 8

busarich · 03-03-2007, 11:54 PM

Thanks will check it out. I don't have the motor back yet or it would be a lot easier. I would just buy one and check it out.

<|SRT-4|> · 04-01-2007, 06:12 PM

Bump, need an answer ASAP.

I tried M8x1.25x12 and they don't seem to fit, but one of my bolts that bolt the turbo to the manifold fell out.

Is it possible to get a couple replacements sent to me?

05plsrt4 · 04-01-2007, 08:44 PM

M8 x 1.25 exhaust manifold to head
M8 x 1.25 turbine housing to O2 housing (on my 50 trim)
3/8" course - turbine to exhaust manifold
5/16" course - wastegate to exhaust manifold

<|SRT-4|> · 04-01-2007, 09:14 PM

Quote: Originally Posted by 05plsrt4

M8 x 1.25 exhaust manifold to head
M8 x 1.25 turbine housing to O2 housing (on my 50 trim)
3/8" course - turbine to exhaust manifold
5/16" course - wastegate to exhaust manifold

Thanks

.

So basically I need a 3/8 coarse to fix my problem. Are there any specs I should look out for? Know the size of the lock washer by chance?

Appreciate the help

<|SRT-4|> · 04-03-2007, 06:00 PM

Quote: Originally Posted by 05plsrt4

M8 x 1.25 exhaust manifold to head
M8 x 1.25 turbine housing to O2 housing (on my 50 trim)
3/8" course - turbine to exhaust manifold
5/16" course - wastegate to exhaust manifold

Just as a future reference, I called AGP to get the info for the turbo to manifold bolts:

Full spec is 3/8"x1" grade 8 coarse thread

onthedwnlow2 · 09-30-2007, 05:55 AM

i used 10x1.5 in my agp mani and they worked awesome.......hmmmmm

Ben@AGP · 10-01-2007, 09:44 AM

The old welded together log manifolds were M10x1.5 for the turbo bolts, and M8x1.25 for the wastegate bolts.

The cast manifold is 3/8x1 and 5/16x7/8 respectively.

onthedwnlow2 · 10-01-2007, 12:36 PM

Quote: Originally Posted by Ben@AGP

The old welded together log manifolds were M10x1.5 for the turbo bolts, and M8x1.25 for the wastegate bolts.

The cast manifold is 3/8x1 and 5/16x7/8 respectively.

my new cast mani has 10x1.5's on the turbo

Ben@AGP · 10-01-2007, 01:04 PM

Quote: Originally Posted by onthedwnlow2

Quote: Originally Posted by Ben@AGP

The old welded together log manifolds were M10x1.5 for the turbo bolts, and M8x1.25 for the wastegate bolts.

The cast manifold is 3/8x1 and 5/16x7/8 respectively.

my new cast mani has 10x1.5's on the turbo

No it doesn't. You can certainly jamb an M10 through the 3/8 holes and think it fits, but it doesn't and you will ruin the threads.

onthedwnlow2 · 10-01-2007, 01:07 PM

Quote: Originally Posted by Ben@AGP

Quote: Originally Posted by onthedwnlow2

Quote: Originally Posted by Ben@AGP

The old welded together log manifolds were M10x1.5 for the turbo bolts, and M8x1.25 for the wastegate bolts.

The cast manifold is 3/8x1 and 5/16x7/8 respectively.

my new cast mani has 10x1.5's on the turbo

No it doesn't. You can certainly jamb an M10 through the 3/8 holes and think it fits, but it doesn't and you will ruin the threads.

im telling you right now whn i got the mani i went thru a bolt bin to find the proper bolts to bolt my turbo down on it and the 10x1.5 was perfect...no american size even came close......i pieced together my whole kit and its a complete agp setup now except the oil feed which was made local

Ben@AGP · 10-01-2007, 01:09 PM

Quote: Originally Posted by onthedwnlow2

Quote: Originally Posted by Ben@AGP

Quote: Originally Posted by onthedwnlow2

Quote: Originally Posted by Ben@AGP

The old welded together log manifolds were M10x1.5 for the turbo bolts, and M8x1.25 for the wastegate bolts.

The cast manifold is 3/8x1 and 5/16x7/8 respectively.

my new cast mani has 10x1.5's on the turbo

No it doesn't. You can certainly jamb an M10 through the 3/8 holes and think it fits, but it doesn't and you will ruin the threads.

im telling you right now whn i got the mani i went thru a bolt bin to find the proper bolts to bolt my turbo down on it and the 10x1.5 was perfect...no american size even came close......i pieced together my whole kit and its a complete agp setup now except the oil feed which was made local

That's good to hear. I load the machines and I machine the manifolds here, and I know what taps are in the tool changer. You can believe what you want, but our cast manifolds have ALWAYS been 3/8 and 5/16.

onthedwnlow2 · 10-01-2007, 01:22 PM

and now that i think about it the wg bolts were 8x1.25 also....the same as the o2/turbo bolts and the dump tube to wg bolts