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I'm getting a set of headers installed and would like to use locking header bolts. Does anyone know the size and thread pattern of the manifold bolts for a 69 472? Thanks.
 

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1968 Deville Convertible
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Sasquatch, I thought all the bolt specs were in the shop manual. I remember from other posts that you have the 69 shop manual. If its not listed in yours, let me know, I can check my 68 manual.
 

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Be careful... those specs you listed are pipe to manifold, not manifold to head... In my '68 shop manual i have here

Exhaust Manifold to Cylinder Head Screw (3/8)-16 * 2(1/8) @ 35 ft.lbs.

I found this under section 6, Engine Mechanical.
 
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