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Old July 20th, 2010, 01:40 PM
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Chris Velardi
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Chris Velardi
1975 101FC
Join Date: May 2009
Location: Hamden, CT USA
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Exhaust manifold bolt size ?

anyone know the proper bolt size ,thread pitch , and length for the bolts that hold the exhaust manifolds to the 4.6 aluminum V8 block ? I'm using Range Rover P38 stainless steal tubular exhaust manifolds that are 10.3mm thick, and ordering either small cap head bolts or Allen headed cap bolts to make them easier to install and remove. The current ones I have a a little sort (18.2mm) and on the chart I'm looking at they are I believe an metric thread but they are smaller than M10 larger than M8 (leaves it in the 3/8" range )

Chris "V"
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Old July 20th, 2010, 07:45 PM
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Ian Gregory
'97 D90 ST #1008
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Location: Henderson, NV USA
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If you mean the manifold to head bolts then they're listed as 3/8" for the 4.0L so maybe the same for the 4.6.

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Old July 20th, 2010, 11:33 PM
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'02 Discovery Kalahari '07 RR SC
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diameter is 3/8, thread is 16, length I believe is 1.25 inches...
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