Quote:
Originally Posted by Prowbar
Another point regarding the A/F ratio of each cyl. would be the PCV valves tapping into runners 3 and 5 but not in runner 1. This should affect the A/F of 3 and 5 to some degree. Especially with a worn engine.
A centralized PCV would be better I think.
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The PCV valves will lean out cylinder 1-3 and 4-6. It also effect the flow through the runners, base on my flow bench numbers. Blocking the passage between the ports will change the flow rate. When I get done with modifying my spare heads, it will not have the internal PCV valves only an external one.