I'm porting a spare cylinder head from goaliemo's parts car before my SC build. I figure while I have the bare head I may as well do some measuring. Here's what I have so far:

Intake Valves: roughly 35.17mm
Exhaust Valves: roughly 30.9mm
Combustion Chamber size (in cc): 48-49cc
Intake port volume: roughly 155-160cc
Exhaust port volume: roughly 70-75cc between all 4 ports

Is there any other information you guys want while I have it here?

 

intake valve is 35.17mm
exhaust valve is 30.09mm

 

Thanks. My caliper battery died so I had to use a ruler. Will update after this goddamn graduation crowd is gone.

 

Hahaha got the job done with what he had... I like it.

 

Not gonna lie my biggest concern was information that wasn't available ANYWHERE that I searched, which was the intake/exhaust port size/volume/cc and the combustion chamber size in cc. Thankfully I have a ton of tools to measure that kind of thing. Also the valves on this head allowed me to measure the port sizes and combustion chambers without huge problems.

 

For what it's worth, Just removing the casting flash, smoothing the cast-foam look inside the ports, and knife-edging the dividers yielded me 180cc intake ports and 80cc exhaust ports. That's roughly 20-25cc increase in the intake ports and 10cc in the exhaust ports. That's huge for such a minimal amount of porting. I could go more but this is already knocking on SBC territory. I don't think such a small engine could benefit from much more porting. Now to mill the head and see where my combustion chambers end up. Hoping to reduce them by 3-4cc and bump my compression ratio by .5-.6 points.

 

Did you ever go any further with this