Is P/P Worth it?

[dezod]

@Carnut

Porting and polishing a head is an art based on science.

While you do not need large ports to make power, you do need properly flowing ports, Do not augment the design, just clean it up. Smooth and round sharp edges or anywhere air needs to make a drastic change in direction. Remove casting flash. You can benefit by polishing the exhaust side completely with metal polish after an extensive polishing with a rough to light grit assortment of cartridge rolls…

Your are 100% correct, but it does come down to app specific technique. For example, Honda heads are pretty stingy and like little to no modifications, but will yeild gains. Back angles and mild ports typically lead to good flow. We scooped 22cfm of additional air flow on a 03 Civic head from .300 to .350. Pretty impressive if you ask me.

I will post some flow test results once we get them on the tC. That head is next.

Tuning with ANY modification will help yeild the most out of it. These OBD2 ECUs are so hung up on being emissions friendly, they do not care to make optimal performance self changes when they are present. So you need to intervene.

P.S.-I am workin on a VERY nice EMS for the tC that will be done shortly.