TwinTurbo.NET: Nissan 300ZX forum - Re: The exhaust portwork looks really good. :)
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Subject Re: The exhaust portwork looks really good. :)
     
Posted by Tech@EPR on January 13, 2012 at 1:30 AM
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In Reply To The exhaust portwork looks really good. :) posted by Ash's Z on January 12, 2012 at 11:58 PM
     
Message Charles heads have the following done.

JWT Valve springs
JWT R4 Cams
Ferrea 1mm OS Valves
Ferrea retainers
Viton Seals
OE Valve keepers

My standard street port (283cfm at .400")
Back cut 2nd angle on intake valves
Coated Chambers
Coated exhaust ports
Honed valve guides
Decked & fully deburred

The heads are capable of 8500-9000RPM


I also modified his lower plenum to uncover the injectors placement in the plenum. This attributes a better fuel mixture motion and atomization in the port. The intake ports were left with a fine carbide finish to add to the mixture motion process.


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