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If you are only mismatched by 1/8" on the sides, then

August 11 2017 at 11:13 AM
Joe-JDC  (Login Joe-JDC)
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Response to Edelbrock RPM porting...opinions wanted..long

I would suggest only going into the port about 1/2" and blend out to the scribe marks on the sides, and leave the floor alone. Don't open up the ports any further back than 1" at most, and you do not need to open them up to the pushrod tube size. Just a simple blend will be able to speed the air up and work well with heads up to 300 cfm. Joe-JDC

 
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