Build progress

[Unholy707]

Hmm… so is the head screwed?

 

[Unholy707]

Wonder if @16GoManGoHC2 has any thoughts as well

 

[covidcommander]

Any amount of leaking can cause the computer to think it's running lean when it's not because it can pull in air--a vacuum leak upstream of the catalytics.

Exhaust valve is closed unless it's exhausting exhaust. Not sure how air could get into the engine...

 

[2ndgen]

Exhaust valve is closed unless it's exhausting exhaust. Not sure how air could get into the engine...

There are 4 valves per bank, all collected upstream of the catalytic. If there's a leak, there can be vacuum on the pipes that have their valves closed from the one that's open. Recall, they are trying to scavenge--that only happens because of lower pressures from the flow--so a leak can draw in cooler air from the engine bay and affect the O2 sensors.

 

[catdad]

Hmm… so is the head screwed?

No, the head is fine. If you are worried about a small leak use the remflex gaskets. All the headers I have installed I have used these with no leaks. I also use arp header bolts and torque them to 20ft lbs. Sucks but can be done.

 

[Unholy707]

No, the head is fine. If you are worried about a small leak use the remflex gaskets. All the headers I have installed I have used these with no leaks. I also use arp header bolts and torque them to 20ft lbs. Sucks but can be done.

Have you ever had carbon buildup or dirty mating surfaces like that? How did you clean them? Thanks

 

[fumanchu182]

Here is how we did my exhaust ports on my headers and about the 100 other sets of headers installed at the shop.

Scotch Brite or 3m bristle disk.
https://www.3m.com/3M/en_US/p/d/b40064937/ (Sold on snapon trucks), clean up exhaust ports.

Gasket and rtv. The machine surfaces have some tolerance. The gasket and rtv will take up the slack and compress and seal. Your surfaces look just fine. Torque to spec and drive it.

If you really want your mind blown, take a flat level and see if your exhaust flange on the manifold is flat. 😉

 

[16GoManGoHC2]

Wonder if @16GoManGoHC2 has any thoughts as well

Paint and gasket remover or Easy Off oven cleaner (not the no fumes one). Be careful don’t get it on paint!