Ford Racing X302 Crate Engine Combustion Chamber
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For the X302 engine, Ford uses the 64cc combustion chamber version of the GT-40X head. This gives a nominal 9.0:1 compression ratio and seems to allow running on rot-gut 87-octane-if you have the ignition timing set at 10 degrees and keep your foot out of it on really hot days. The stainless steel valve package measures 1.94x1.54 inches. View Related Article
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