[HWYSTR455]

Who told you the ports are too big for your app? They have the same runner volume as a E-Head, which work fine on 400s.

The 'typical' E-Head package from any of the Pontiac vendors is usually 310cfm or so, which is still more than the SpeedMaster out of box. The KRE D port generally is setup for 295cfm.

Remember too, that in 'general', you shoot for about an additional 1 point more static CR for aluminum heads. That puts you roughly in the 10.5 SCR range. (many go more)

If you're building a 400 block-based engine, the cost difference between building a 400, and say a 461+ stroker, is nominal. And you know what they say about 'displacement'.

Stroker rotating assemblies usually can be ordered with pistons that target your desired target SCR, and no additional cost.

In other words, if you're building an engine from scratch, it makes total sense to build a stroker.

Even if you're not shooting for a max-effort build, having a larger displacement engine means you will be on the low-end of the duty-cycle, and that means it will last longer.

.