Hey everyone, first post here. I am preparing to install a cometic streetpro too end gasket kit on my 92 EG hatch with a swapped D16z6 it is currently turboed and pushing 26 pounds at max. (I bought it this way, will most likely be dialing it back) i am looking for any and all tips and advice in going about this gasket job.. so far I have replaced all of the valve stem seals and am moving on to the main gaskets themselves.. since the head and exhaust gasket are both MLS will I need the copper spray? I am very new to this and will appreciate any and all input. Thank you.

 

If the head gasket is already viton rubber coated, no spray is required or recommended.

Copper spray was for non coated mls gaskets. The viton coating does the same thing as copper spray but better.

 

Thank you very much. I appreciate it

 

No worries, the key to head gaskets is the prep/cleanliness of the surfaces, bolt holes and bolts as well as the surface finish/flatness of the contact surfaces.

You have to be sure both the block and head contact surfaces are both flat and smooth. Flat can be checked as per the FSM (factory service manual) with a precision straight edge and feeler gauges. The RA for smoothness of the surface is usually done by having the head and sometimes the block milled/resurfaced. I believe there is a laser tool that can read surface RA but it's not something any average mechanic will have due to cost restraints.

Typically if the engine already had an OEM mls gasket the RA is satisfactory and you only need to check the flatness of both surfaces. If the engine had the old graphite gasket, then resurfacing may be required or use of a Felpro permatorque head gasket with the blue coating. Their gaskets will handle a rougher finish than some others and be a bit more forgiving.

https://www.felpro.com/parts/engine-...d-gaskets.html