Someone school me on factory heads, please!

[greasyspider]

What are the differences in casting numbers in terms of performance?

[terrible one]

This will get you started. 

http://www.moparmusclemagazine.com/techarticles/5115_cylinder_heads/index.html

http://www.moparmusclemagazine.com/techarticles/5118_cylinder_heads_ii/index.html

[b5blue]

Big or small block? 

[greasyspider]

Big block. Those links are pretty much what I was looking for thanks!   What does open and closed combustion chamber mean?

[chargd72]

Big block. Those links are pretty much what I was looking for thanks!   What does open and closed combustion chamber mean?

It relates to how many CCs your combustion chamber will have.  Closed chambered heads will have significantly less CCs and are good when you're looking to bump up your compression. 

[firefighter3931]

Closed chambers are better for detonation resistance with the right piston combination. If you're using an open chamber head it's better to keep the compression ratio at 9-9.5:1 if you want to run it on pump gas.


Ron

[greasyspider]

Closed chambers are better for detonation resistance with the right piston combination. If you're using an open chamber head it's better to keep the compression ratio at 9-9.5:1 if you want to run it on pump gas.


Ron

But physically, how are open and closed chambers different?

[Troy]

Closed chambers are better for detonation resistance with the right piston combination. If you're using an open chamber head it's better to keep the compression ratio at 9-9.5:1 if you want to run it on pump gas.


Ron

But physically, how are open and closed chambers different?

The easiest way to tell is that the "open" chamber (recess where the valves are) is pretty much round - about the same diameter as the cylinder/piston. The "closed" chamber will have part of it basically flat with only the valves and spark plug recessed. These usually have a much smaller volume (and higher compression) in relation to the "open" chambers. For Mopar big blocks, 906, 452, 213 castings are examples of "open" chamber heads and 915 and 516 castings are "closed".

There are some pictures in this article:
http://www.moparmusclemagazine.com/techarticles/engine/mopp_060800_mopar_max_wedge_cylinder_heads/factory_parts.html

Troy

[greasyspider]

Got it, thanks

[maxwellwedge]

What? No Big Boobies!!!!