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rotorwrench · 01-23-2022, 09:43 AM

If your tappets are the adjustable type then it's not a difficult task. If they are original type tappets then the job gets a lot more complicated. The old two piece guides have to be driven out to remove the valves on the original design. Valves would be ground on the stems to open clearance up or the valve seat cut for too wide a clearance. If the clearance is close then I wouldn't mess with it unless it would allow the engine to run properly.

The manifold surface should be completely cleaned off after removal of the last two studs there. It can then be evaluated for condition. This is a spot that can have a little bit of material planed off but it would have to be set up in a mill to do that. If the surface only has some minor wear or impact areas then a new copper gasket could likely still be made to seal as long as the irregularities aren't too deep or large.

01-23-2022, 09:43 AM	#3
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: model b intake diagnosis If your tappets are the adjustable type then it's not a difficult task. If they are original type tappets then the job gets a lot more complicated. The old two piece guides have to be driven out to remove the valves on the original design. Valves would be ground on the stems to open clearance up or the valve seat cut for too wide a clearance. If the clearance is close then I wouldn't mess with it unless it would allow the engine to run properly. The manifold surface should be completely cleaned off after removal of the last two studs there. It can then be evaluated for condition. This is a spot that can have a little bit of material planed off but it would have to be set up in a mill to do that. If the surface only has some minor wear or impact areas then a new copper gasket could likely still be made to seal as long as the irregularities aren't too deep or large.