Quote:
Originally Posted by Yoyodyne
On the subject of ports, is there an often chosen size of intake port at the manifold/block surface for mild street engines? Best makes a "Big Port" intake gasket, and it seems I've seen many recommendations here to just open the block and manifold to match that gasket. http://www.bestgasket.com/engine_cat...59A%20Std-Bore....... |
If you open the intake ports to match the "Big Port" gasket you need to open up the entire port from carb to intake valve to keep the port size consistent. Air does not like to have to speed up and then slow down (flow is lost). Plus, the smallest diameter section of the port is what will limit flow. Where is the smallest cross section in a flathead port??