jsieve

Anyone have any experience either smoothing out the lip on the center housing or putting filler in the intake manifold to smooth the transition from lower intake manifold runners into the block?

The FC intake manifold gasket on the GSL-SE block.


The outer ports line up fine, but the inner ones you can see the difference in size. So curious if anyone has dealt with this or is it worth the effort

ioTus

iTrader: (5)

If anything I would decrease the size of the intake manifold to match the GSL-SE block primary ports.

Smaller runners will make for faster velocity of air and increase horsepower (fractionally). The only place you want to port an intake larger is the actual housing inside the combustion chamber, which is changing rotor intake volume and timing.

A lot of people want to port and polish out the intake manifolds - however this will only decrease turbulence (which causes fuel to condense back into droplet along the intake walls unless you rough up the surface) and slow down the intake charge velocity.

Unless you're dis-assembling the engine and porting the irons, i'd stick with decreasing the primary runners on the intake.

Will you be upgrading to 4 injectors for the FC manifold or just using the two GSL-SE? (You'd be fine with the GSL-SE)

You'll also need to block off that exhaust port in the middle/bottom for the S4 intake. I suggest the method of welding on a little tab to the S4 lower mani.