Manifold studs

I needed to replace a few exhaust manifold studs so I started looking online to see if I can find the right m8-1.25 double ended studs for the Fiat 124. I found quite a few automotive specialists selling some very expensive stuff. About $4/stud+nut. Which I thought was just ridiculous so with a bit of perseverance I eventually found an affordable source for manifold studs.

The part is Dorman #03411.You get 10 studs and 10 self-locking flange nuts. And it only costs around $8.00 for the set.

The dimensions of the stud are as follows;

Inside threads    = 20mm
Shoulder            = 10mm
Outside threads = 20mm
Hex (5mm) head = 6mm
Total Length      = 56mm

And the flange nut is 10mm long and has a 13mm hex head.


Apparently the intended application is for Ford 2004-97, Lincoln 2002-98 V8 engines. But it works perfectly on the Fiat 124 engine.

The stock exhaust manifold mounting face is 15mm thick and the intake manifold is 25mm. So the kit should work fine on the exhaust side but is too short for the thicker intake manifold.