Raceline recommends following the manufacturer recommendations on how much piston ring gap per bore, but depending on the type of applications, Lo says you might have to alter the specs. A prime example would be if the engine is built as a street motor running on Arias Pistons. Lo says, "Go by Arias' specs on piston-to-wall clearance, which they usually recommend three to four thousandths of an inch depending on piston size. Ask your manufacturer if the piston is 2618 forged aluminum, which has no silicone content within the piston, or a 4032 forged aluminum unit, which is a silicone content piston." Both pistons have different expansion rates where the high-silicone content piston will tend to expand more. The 4032 aluminum expands approximately 15 percent more than 2618 aluminum. The 4032 pistons have greater wear characteristics because of the silicone particulate hardening the alloy and reducing the thermal coefficient of expansion. However, a silicone aluminum alloy piston can turn brittle and become prone to fracturing when subjected to extreme stress. This is the main reason why we choose not to use a 4032 aluminum piston in our forced induced S2K, because it will be seeing a lot of cylinder pressure from the large amounts of boost we plan to run through the engine on pump gas.
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Things move along as we install a new set of Golden Eagle/Arias 9:1 compression pistons which are only available though Golden Eagle. | 
Raceline uses a plastigage (a string-like material) to measure the bearings' oil clearances before buttoning up the motor. |
Using the factory torque specification, Raceline tightens the rod bolts in a series to evenly secure the Crower rod. | 
The removal of the end cap and a quick measurement reveals the bearing being too large in diameter for the new crank and rod. | 
All Honda factory parts, crank bearings and rod bearings are color-sequenced dependant on size. |
Using a factory Honda head gasket, Elton installs the timing chain cover. | 
Taking the necessary steps to use oil to lube the head stud threads and end, the F20C cylinder head and valvetrain were installed. | 
The S2K engine is beginning to take shape as we look towards rocking some serious boost in this puppy. |