Exhaust manifold to head pipe bolts

azopelnut · 07-27-2007

I searched and could not find this ...can anyone tell me what is the size:
length, thickness and thread pitch of the bolts that join the head pipe to the exhaust manifold?

Bill Hoffmann · 07-27-2007

I believe they're M8 x 1.25 x 25mm, but one needs to be 30mm if you use the bracket or brace that ties the flange to the block.

Bill Hoffmann · 07-27-2007

...also, you can get them in stainless steel at almost any hardware store these days, and I would recommend that as well as anti-seize compound on the threads.

Bill

opelbits · 07-27-2007

I find it best to replace them with studs and then use brass nuts. The studs make it much easier to install the pipe and the brass nuts will not seize.

The studs need to stick out a little further than the head of a bolt would, about 15 mm.

07-27-2007	#4 (permalink)
opelbits Detritus Maximus Join Date: Jul 2002 Location: St. Louis MO Posts: 1,160 Provided Answers: 1	I find it best to replace them with studs and then use brass nuts. The studs make it much easier to install the pipe and the brass nuts will not seize. The studs need to stick out a little further than the head of a bolt would, about 15 mm. __________________ "No, it's not fiberglass." "No, the motor is not in the back." "No, your friend in high school did not 'peg' his speedometer."

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07-27-2007	#2 (permalink)
Bill Hoffmann Opeler Join Date: Jul 2002 Location: Wilmot, WI Posts: 316 Provided Answers: 2	I believe they're M8 x 1.25 x 25mm, but one needs to be 30mm if you use the bracket or brace that ties the flange to the block.

07-27-2007	#3 (permalink)
Bill Hoffmann Opeler Join Date: Jul 2002 Location: Wilmot, WI Posts: 316 Provided Answers: 2	...also, you can get them in stainless steel at almost any hardware store these days, and I would recommend that as well as anti-seize compound on the threads. Bill

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