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The heart-shaped combustion chamber of the KRE head is similar to what is used on the modern LT1, LT4, and LS1 engines. The design promotes swirl, which results in a quicker burn of the mixture. Spark plug location is nearly at the bore center, placing it in the highest turbulence area of the chamber. This also results in a quicker burn, thereby requiring less spark lead and providing a higher octane tolerance. Note the plug is angled toward the exhaust port on the KRE head because that's the hottest part of the chamber. <p>
KRE's New Aluminum Pontiac Head Exposed

 The heart-shaped combustion chamber of the KRE head is similar to what is used on the modern LT1, LT4, and LS1 engines. The design promotes swirl, which results in a quicker burn of the mixture. Spark plug location is nearly at the bore center, placing it in the highest turbulence area of the chamber. This also results in a quicker burn, thereby requiring less spark lead and providing a higher octane tolerance. Note the plug is angled toward the exhaust port on the KRE head because that's the hottest part of the chamber.

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