Horse Power Potential of Cylinder Heads

The problem so far is not so much the head flow but the thinking of needing more than what will work is my fear here. You can put to much head on a engine for a given performance level.

Describe the engine build, trans to be used, rear end gear & tire size as well as intended useage. With this info, we could better prescribe a head rather than possibly mislead you into a larger more well ported head.

At 410 cubes, the engine will want a head a normal CID engine like a 340 or 360 would want. At 410, it does need to breath some. The OOTB Edel. head will loose steam quick. How far it should be opened up is another matter. Depending on the build and useage, it could be some or all the way. Which with 3.55's, is probably not the way to go. But we will see what you have in mind and the build of the engine later.