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Hemi Engine Plugs

As noted in this picture, the electrode position of several plugs was less than optimal, indicating power to be had simply by indexing the plugs. Seems to us the heads have plenty of room to be machined for bigger valves. This is what makes a Hemi a Hemi-the hemispherical design of the cylinder head's combustion chamber. Note the efficient dual-plug-per-cylinder design and the closed-chamber design on each side of the plug. The added quench of the combustion chamber adds to the already detonation-resistant design of the Hemi head, allowing for more compression and lower octane requirements.
Mopar Dodge And Chrysler 5.7 Liter Hemi Engine - Inside The 5.7 Hemi

 As noted in this picture, the electrode position of several plugs was less than optimal, indicating power to be had simply by indexing the plugs. Seems to us the heads have plenty of room to be machined for bigger valves. This is what makes a Hemi a Hemi-the hemispherical design of the cylinder head's combustion chamber. Note the efficient dual-plug-per-cylinder design and the closed-chamber design on each side of the plug. The added quench of the combustion chamber adds to the already detonation-resistant design of the Hemi head, allowing for more compression and lower octane requirements.  View Related Article

 

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