The engine is nearly ready to go in the S14 but for the turbo to clear the steering rack the perfect solution is to fit a passenger side exhaust manifold on the drivers side, so 2 questions

 

1) Any performance/running issue in this?

 

2) How easy is it to drill/tap 6 new threads for the bolts as the are opposit to the orifinal ones?

 

Before anyboddy gets confused this is a TT engine into the S14 body.

If I understand you then do this, might work...........each TT or NA head has 4 threaded holes around each exhaust port on the head with only 2 studs screwed in diagonally. All you need to do is remove the 2 studs per port to the opposit diagonal on all 3 ex ports and then your manifold will fit.

That would work but on my heads there are only 2 holes drilled not 4?

you should be ok to drill and tap them mate here is a close picture off my head and you can see the holes clearly.

I have 3 sets of heads, 2 TT and 1 N/a set and all have 4 holes..............strange.

Hope you come right.

Got the engine out and guess what, omly 2 holes each side?? How come others have 4??