Cm870 upgrades

[Hammerhead]

(01-02-2017 )Rawze Wrote:  * Have the head hand torqued to 300-ft lbs, and let it sit overnight so that the gasket will crush properly. Torque it a second time the next day, then do the 90-degree final torque on the bolts. most shops will not bother to let it sit overnight, then re-torque because they are in too much of a hurry.

Ok, just wanna make sure I understand this correctly.
-Hand torque the head bolts to 300 ft/lbs
-Next day (24hrs?) re-torque to 300 ft/lbs
-Then rotate the head bolts 90*

Do you wait a specific amount of time between re-torque & 90, or just do the 90 after completing the re-torque?

Rawze Wrote:Exhaust manifolds for them on the other hand, are a waste of time/money and you will see no measurable gains from them.

Would there be any gains by ceramic coating an exhaust manifold?
The ceramic coating should, in theory, reflect the heat away from the metal of the manifold reducing heat soak and directing the heat to the exhaust wheel, making more efficient use of the heat energy.
Has anyone tried it?
Is there, or would there actually be, any measurable gain?

I ask because I have an extra manifold and I've thought about sending it to be coated and wonder if it's worth it.