The questions continue...
I bought a head many moons ago, and when i did my chassis swap i finally got to putting it in. It's had a fair bit of porting (could be an understatement) and when it was all up and running i saw boost figures of 5-7psi on an OBD stage 2 fresh charger. This is with a gt inlet and 51mm TB. Now it's coming to putting things back together and im looking at gaskets and ports and wondered how much matching i should do.
Inlet manifold - 33x28mm (height x width)
gasket - 36x28mm
head - 35x28mm
So, do i take out more from the manifold (im thinking yes) but is it possible to take a bit of the gasket off. With the bolts in there's a bit of wiggle room and could, if not aligned perfectly, block some flow. Also need to know which way round the gasket goes.
Exhaust manifold - 39x39mm
gasket - 32x32mm
head - 30x28mm
This im pretty certain i'll leave alone, the gasket and head match quite well with a bit of wiggle allowed for the gasket. My small concern is with the manifold being so large, that gas may get caught up behind the gasket and potentially leak or block flow.
Thoughts and comments welcome, all figures are within 0.5mm.