Hey guys
Now I'm chasing a final answer on this
the oil plug/restrictor found on the C20XE blocks, but isnt there on the C20NE blocks, nor is it there on the X20XEV
now people run X20XEV blocks with C20XE heads correct? with no problems?
Then my next questions basically
is it actually required?
see the pictures below
the first is MY block which was a C20NE block without the valve fitted
![Image]()
the second is the same block, different pistons but this time i had the little bung fitted, notice though that this doesnt work as there is not enough block surface area around the outer edge to seal against the head gasket, so without adding more surface face (welding the block and having it surfaced again) you cant really run a 16V head on an 8V block with a 16V gasket..
![Image]()
the third is a clear c20xe block with the oil restrictor in full view, notice the difference in block surface area from second pic to third pic around the restrictor
![Image]()
the fourth is the x20xev block with no restrictor
![Image]()
i think this one is an ecotec block
![Image]()
so if people are using X20XEV blocks with the 16v head, is that ok then to basically have a C20NE block, weld up the back of it to increase the surface face to seal the head gasket just EXACTLY like the X20XEV block then (see below, this is what the C20NE block would look like with the extra surface area welded on)
![Image]()
OR should be using a block with the special oil restrictor thing in it... from what i have read/searched is that this little thing basically does nothing... and everyone says XE head ontop of a XEV block is a goahead
I'm using a cometic/wiseco MLS headgasket by the way, if that means anything or not
reason being is im building this XE and i dont want to have oil pressure problems, or any sort of oil starvation issues
ive had problems in the past with a jammed releif valve and that caused 2 rebuilds until i replaced it with a brand new pump, but this build ill be using the SBD nylon releif valve kit and the steel inner oil pump gear..
Now I'm chasing a final answer on this
the oil plug/restrictor found on the C20XE blocks, but isnt there on the C20NE blocks, nor is it there on the X20XEV
now people run X20XEV blocks with C20XE heads correct? with no problems?
Then my next questions basically
is it actually required?
see the pictures below
the first is MY block which was a C20NE block without the valve fitted
the second is the same block, different pistons but this time i had the little bung fitted, notice though that this doesnt work as there is not enough block surface area around the outer edge to seal against the head gasket, so without adding more surface face (welding the block and having it surfaced again) you cant really run a 16V head on an 8V block with a 16V gasket..
the third is a clear c20xe block with the oil restrictor in full view, notice the difference in block surface area from second pic to third pic around the restrictor
the fourth is the x20xev block with no restrictor
i think this one is an ecotec block
so if people are using X20XEV blocks with the 16v head, is that ok then to basically have a C20NE block, weld up the back of it to increase the surface face to seal the head gasket just EXACTLY like the X20XEV block then (see below, this is what the C20NE block would look like with the extra surface area welded on)
OR should be using a block with the special oil restrictor thing in it... from what i have read/searched is that this little thing basically does nothing... and everyone says XE head ontop of a XEV block is a goahead
I'm using a cometic/wiseco MLS headgasket by the way, if that means anything or not
reason being is im building this XE and i dont want to have oil pressure problems, or any sort of oil starvation issues
ive had problems in the past with a jammed releif valve and that caused 2 rebuilds until i replaced it with a brand new pump, but this build ill be using the SBD nylon releif valve kit and the steel inner oil pump gear..
