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1968 Challenger Hemi Engine Head Porting

 
 
1968 Challenger Hemi Engine Head Porting
1968 Challenger Hemi Engine Head Porting
The heads are stock pieces, casting No. 2780559. Jeff Kobylski at Modern Cylinder Head in Clinton, Michigan, gives them a mild porting. Previously, somebody added hardened valve seats that were too large and compromised the exhaust flow. This could have been corrected with some creative welding in the port, but cracking was a possibility we had to consider. (See chart on p. 59 for flow numbers) View Related Article
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