Exhaust Manifold Bolt Size
Record Breaker
Joined: Jul 2007
Posts: 2,040
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From:
hints:
1. do NOT use cad plated bolts, studs, nuts. only use plain.
2. only tighten to 70-80% of full tightness the first time. after 4-6 heat cycles take to full tightness. they will seal better. if it leaks be for that go ahead and take to full tightness.
3. dont forget the anti-size compound on the threads.
1. do NOT use cad plated bolts, studs, nuts. only use plain.
2. only tighten to 70-80% of full tightness the first time. after 4-6 heat cycles take to full tightness. they will seal better. if it leaks be for that go ahead and take to full tightness.
3. dont forget the anti-size compound on the threads.
Last edited by moe7404; Mar 10, 2013 at 04:56 PM.
Champion
Joined: Sep 2012
Posts: 4,868
Likes: 434
From: Central VA
As noted above, the thread size is 5/16" x 18 in the heads. If you measure the thickness of the manifold at each bolt hole and allow for about 3/4" of thread engagement into the head, you will come up with the lengths you need. You can also use studs for at least the two center bolt holes on each side of the head to help with manifold and gasket alignment during the re-install.