Assuming both heads use ITR LMAs, valvetrain, etc is there any difference in flow between a B16 or Type-R head after a full port and polish? Basically, would it be worth it to send off a more expensive Type-R cylinder head to be ported versus just a standard B16 VTEC head? Or will they end up being essential the same after the headwork?

 

pretty much the same

 

just porting the bowls pretty much turns a B16 head into a Type-R head

 

They use the same cast as type R. Give it a nice port job u should be nice

 

I'm sorry to ask this in your thread, but i must finally know. What are LMAs?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked2night &raquo;</TD></TR><TR><TD CLASS="quote">I'm sorry to ask this in your thread, but i must finally know. What are LMAs?</TD></TR></TABLE>

Lost Motion Assemblies.

 

I usually tell customers to provide a good B16 head that has minimal port shift.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">I usually tell customers to provide a good B16 head that has minimal port shift.</TD></TR></TABLE>

Is that the same as core shift? I never really understood what that was anyway? Is it a shift right where the casting line is inside the port when the top and bottom may have shifted side to side?

 

Yeah.


This is bad core shift. The port is not aligned with the valve seat. Picture is from Marcin.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">Yeah.


This is bad core shift. The port is not aligned with the valve seat. Picture is from Marcin.

</TD></TR></TABLE>

What causes this shift?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by no2psi &raquo;</TD></TR><TR><TD CLASS="quote">

What causes this shift?</TD></TR></TABLE>

I'm guessing worn valve guides which would allow the valve to be misaligned. Therefore it sits off-center and bores out a nice seat for itself.

Or I could be totally wrong.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FairlightRacing &raquo;</TD></TR><TR><TD CLASS="quote">

I'm guessing worn valve guides which would allow the valve to be misaligned. Therefore it sits off-center and bores out a nice seat for itself.

Or I could be totally wrong. </TD></TR></TABLE>

I believe it has to do with when the head was originaly cast.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by no2psi &raquo;</TD></TR><TR><TD CLASS="quote">What causes this shift?</TD></TR></TABLE>

Earthquakes in Japan.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">

Earthquakes in Japan. </TD></TR></TABLE>

lol

 

Thats pretty bad for a Honda head...
That looks more like something GM would make!
Let me see if I can find some core shift pictures next week....