K-series Cylinder Head Flow Information
Honda cylinder head flow comparing:
- RSP version – This version comes on the Honda Civic Type-R 2006-2011 FN2. This version flows the best of all the standard heads and is an excellent upgrade for a high output K24 engine. This head looks very similar to the RBB style head with some factory porting and obviously the casting stamp is different.
- PRB version – This version is the most popular and comes on the Honda EP3 Civic Type-R and the Honda Integra DC5 Type-R. This version is one of the best heads for flow in standard factory form.
The most noticeable difference on this head is the large coolant port opening on the right hand side of the head. - RBC version – This version comes on the Honda Accord CL7 JDM Euro-R. This version flows very well and is an excellent upgrade for a high output K24 engine. This head looks very similar to the RBB style head with some factory porting and obviously the casting stamp is different. The RBC head comes on a K20A JDM engine which produces 220bhp from factory so it needs to have very good factory flow as the rev limit on this model is close to 9000rpms.
- RBB version – This version comes on the Honda Accord K24a3 and other vehicles equipped with the higher spec K24 engines. This version flows very well and can flow enough for the K24 engine to reach 230-240hp without modifications. The casting for this head leaves alot of room for porting which would dramatically increase the flow of the head.