![]() The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance. Opinions may vary between piston and valve manufacturers, but a popular consensus is a minimum clearance of. Examples include resurfacing the deck of the cylinder block or cylinder head, going to a thinner head gasket, increasing the ratio of the rocker arms or installing a high-lift camshaft. However, it’s still critical that the piston-to-valve clearance be checked during engine assembly-especially if there have been any changes to the engine that could affect this critical clearance. The trend towards boost has relaxed some of the anxiety among engine builders as the static compression ratios have decreased when compared to high-strung naturally aspirated engines. Checking piston-to-valve clearance is a mandatory practice to ensure the relationship perfect. Too much clearance and you're giving up performance from low valve lift too little and absolute carnage ensues. The relationship between pistons and valves is one of high volatility.
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