Before taking the engine block to the machine shop you can clean up the interior block surface and remove any casting flash.
Before you can start modifying the engine block you need to know what you have. During the disassembly process measure the engine parts and compare them to the Nissan specifications.
Intakes are typically cast and consequently can end up with casting flash and misshapen ports due to mold shifts. If you are porting your cylinder head you already have all the supplies you need to also port your intake.
One big area for improvement on the L-series heads is modifying the intake and exhausts ports. Here is a step-by-step guide for porting and polishing the ports.
Key to increasing the performance of an L-Series motor are modifications to the cylinder chambers. This article covers CC'ing, unshrouding the valves, valve set transitions and chamber polishing.
With the Datsun Cylinder Head disassembled now is the time to clean it and see what you have before you begin making performance modifications.
Disassembling a Datsun Cylinder Head is straight forward with a few unique tools. Once the head is dissembled and cleaned you can begin making performance modifications.
The engine in my Datsun 240z at the last track day started to feel underpowered and then began smoking on take offs. Time to investigate...