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The original '51-'58 Chrysler FirePower Hemi (Gen I) utilized cast-iron heads with fully machined 109cc combustion chambers, centrally located spark plugs, and an included valve angle of 58.5 degrees. Flat-top pistons delivered 7.5:1 compression. Note how the valves open toward the center of the bore away from the shrouding effects of the cylinder walls, and double rocker shafts actuate the valves. View Related Article
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