V6camaroman

i have a ques for anyone. on a stock l98 head is 64cc's will that change if you port it?

SweetS10v8

The only way your 64cc heads will change(doing port work) is if you do any work to the combustion chambers. Porting the heads makes the intake port larger, not combustion chambers. I think you might be confusing the numbers a little.

combustion chambers are the typically 58cc-76cc
Intake ports are the numbers that are typically 160cc-220cc

SweetS10v8

You may know this, dont take it as an insult if you know already.

shaggy56

Dont forget the most important part the combustion ports. This is really where most of your porting should be done since not much is gained from the intake ports. Dont take it from me but a professional.

Heres an excerpt:

"Gasket-matching the intake ports is an easy task, but it’s only a small step in moving air through a head. Porting the walls of the runners is time consuming and offers almost no flow improvements"

Heres another:

"Cylinder head porting is more about how well air flows through the port rather than port size"

article

SweetS10v8

Thats right, porting is done in bowl area, underneath the valves(which will enlarge port size). Thats where people port to get airflow increases. I was trying to clear something up for him combustion chamber vs. intake port)

Original poster: If you look in that article in the picture where he uses dummy valves to clean up the combustion chamber, thats how you go from 64cc to 66cc...

89_IROC_98U

Sorry to bring this one back, but I didn't want to start a new thread for a question that seems appropriate for this thread...

Are L98 heads worth the time and money invested in upgrading? Let's assume an extremely tight budget and that the heads are already part of a complete L98 engine that is in need of a rebuild. Thanks in advance for any responses.

- 89_IROC

edit: I forgot to mention that these are iron heads from a 350 IROC.

SweetS10v8

On a really tight budget its best to run what you have already, but make them as good as they can be.

Port em yourself and get as much as you can! Then save for heads in the future.

D Stroy H8

L98 can flow really well actually. Its a direct product of how much time you're investing. If you can find the time to do all the port work yourself, you can make L98 heads performance heads. If you need to pay a shop - I'd just buy some out of box Worlds or Trickflow.

Bottom line:
You do - yes.
You pay - no.