Question on port matching
Center/common/siamese wall most critical, yes.
Opening the pincht side/dogleg window to the gasket has theoretically multiple effects. You theoretically lengthen the dogleg wall. The air speed is fixed by the cross section @ the pinch as I know it.. so length or reduction of speed 'I dont have or use a pitot' ..either way it's been useful to both ways 'port dependant' ..as has lipping I've had to learn it cave man over the years to learn what I know/think I know/and regardless of either have the ability utilize their effects.
Slightly smaller is .020
A lot is .060+
I've personally seen the anti reversion effect of a lot smaller..as in ootb intake to gasket matched head. The scenario was reminiscent of .600 lift on stock heads.
The best flowing ported iron I have is only gasket matched roof,floor,common wall and not the pinch wall at all. Bulge is paper thin however. Another crumb...assume the straight wall does not need pushed so hard. Shape.
As for the velocity drop with opening the intake up at/to the gasket...if the runner isnt as big leading up and is smaller than what you end up after gasket matching...you hurting low end power ime.
Even a magnum engine, fuel injectors just recessed inside at the windows...the stock windows have a bulge narrowing the cross section. Imo they were speeding the air to better carry/better suspend the mist.
If you gasket match that in past that...you will feel slight a lack in umph off the line. Imo you effectively moved that torque up to the 3000 rpm range.
It can all be very critical.
If driveability isn't necessary..then anyone can build a big power big rpm gas guzzling loud and stinky pos.... itll just suck everywhere out side the cam and have a mediocre average torque.
Tricks.
Center/common/siamese wall most critical, yes.
Opening the pincht side/dogleg window to the gasket has theoretically multiple effects. You theoretically lengthen the dogleg wall. The air speed is fixed by the cross section @ the pinch as I know it.. so length or reduction of speed 'I dont have or use a pitot' ..either way it's been useful to both ways 'port dependant' ..as has lipping I've had to learn it cave man over the years to learn what I know/think I know/and regardless of either have the ability utilize their effects.
Slightly smaller is .020
A lot is .060+
I've personally seen the anti reversion effect of a lot smaller..as in ootb intake to gasket matched head. The scenario was reminiscent of .600 lift on stock heads.
The best flowing ported iron I have is only gasket matched roof,floor,common wall and not the pinch wall at all. Bulge is paper thin however. Another crumb...assume the straight wall does not need pushed so hard. Shape.
As for the velocity drop with opening the intake up at/to the gasket...if the runner isnt as big leading up and is smaller than what you end up after gasket matching...you hurting low end power ime.
Even a magnum engine, fuel injectors just recessed inside at the windows...the stock windows have a bulge narrowing the cross section. Imo they were speeding the air to better carry/better suspend the mist.
If you gasket match that in past that...you will feel slight a lack in umph off the line. Imo you effectively moved that torque up to the 3000 rpm range.
It can all be very critical.
If driveability isn't necessary..then anyone can build a big power big rpm gas guzzling loud and stinky pos.... itll just suck everywhere out side the cam and have a mediocre average torque.
