The only things that are the same are the head, ex exhaust cam, crank, rods, lower intakes mani, water pump and accerssories like ac and ps pumps and thats about it. Get everything else.
Shouldn't really matter. The whole system is under the same pressure.
Prolly would want it on the feed side so it cools before it gets to the turbo.
Never seen someone put a cooler for coolant on the turbo before. Oil cooler would help more if don't already have one.
then do a compression test and a block test.
blue is oil. white can be oil or coolant.
That will rule out bhg and it could just be valve stem seals. Wont know without testing. IF hg is good then its valve stem seals.
Why not buy the correct housing for it?
Twin scroll need to be used together in order for it to work properly. You can run a non divided housing on a divided manifold with no issues. Twin scroll will spool faster tho.
Do a compression test. Then do one with a tad bit of oil in each cylinder, If the numbers go up its the rings.
Valve stem seals will smoke on cold start up usually only unless they get really bad.
Having a bhg has nothing to do with compression testing and is usually one of the things you...
Port and polish will help in the top end. Cams will help too. Springs are needed for cams. Bigger valves allow for a better faster flow. Which also helps.
If the head is off it would be a good thing to do. Then just add cams, springs and retainers later.
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