stripped intake manifold nut.

i stripped one of the nuts on the bottom side of the intake manifold. the one right under the number 3 runner. b18b manifold. its hard to get a socket to fit firm on the nut and i had an extension and swivel attached and it kept slipping off and rounded the nut. does anyone have suggestions and do you think a bolt extractor (external) will fit around the nut and clear the manifold???v

can you get a long punch or chisel on one of the edges and strike it?

probably not space is tight its still in the car. i have to go under the car and reach it from the bottom to really have any access to it.

yea that’s what imean. from underneath, can you get a really long chisel or punch on it?