Ported Edelbrock versus W2 out of the box !
And yet...... even Ma Mopar decided to abandon the open chamber for all successive W series heads after the W2.
I am not a cylinder head authority either, but correct me if I am wrong.
Aside from Chamber shape, head flow, quench etc, is not part of the reason for the trend towards closed chamber also because it allows for a lighter weight rod and piston assembly and a flat top piston which also helps the flame front
As I started to build my first 4.0 stroker I started to realize that everything about the overall engine is better.
Because of the longer stroke and increased swept volume, it was easier to get a high compression ratio, even with an open chamber, and without a dome on the piston.
Again because of the longer stroke, the wrist pin sits higher up in the piston, allowing for a shorter overall length piston, again making the weight of the piston much lighter.
Because of the flat or dished piston top, and a closed chamber head
You get a better overall burn rate.
My old stock stroke 340 piston Were really heavy with a huge dome
that struggled to get 10.9:1 compression after the valve reliefs were cut to clear a .585 lift cam.
My new stroker with the same heads has a measly .100 flat dome,
Weigh at least 200 grams lighter, clear a .700 lift cam easily at 12.7:1 compression.
These stroker motors, even with a modest performance head, seems to me cannot lose.
