VH Exhaust Manifold

[mrvdv85]

hey all
does anyone know which bolts to undo when changing a exhaust manifold gasket on a blue 202 motor in a VH Commodore? i got some type of instructions but just need to know which exact bolts to undo.

[ari666]

ummm, all of them?

lol, what do you mean? you will need to get the whole manifold off to clean and prep the block and manifold surfaces anyway... i think there are two flange bolts and about 2 bolts for every port...

[Not_An_Abba_Fan]

On the VH there are 4 flange nuts as it is a twin header pipe assembly, then there are 8 nuts that hold the intake/exhaust manifold assembly to the head. You will have to remove the carby to get the two nuts under the heat shield.

They have a bad tendency to leak at the heat riser box too, to you may have to separate the manifolds and replace that gasket too. Worse case scenario, the heat riser box contact surfaces have warped so you may have to fit extractors.

[mrvdv85]

just replaced the flange gasket and it runs beautiful now still a tiny leak in the other part above the flange where that spring bit is but aprt from that it runs fine

[Not_An_Abba_Fan]

So you didn't take the butterfly off and replace the bigger flat gasket under that?

[mrvdv85]

yeah i did, but its being a bit stupid at the moment, i might need another manifold cause its got a threaded bolt which just keeps turning whether you undo it or do it up

[ari666]

drill out the hole, put a longer bolt on it and use a new nut