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cc-rider · 02-26-2016, 05:41 PM

What is the generally accepted "flatness" spec for headers flanges? After all 4 tubes are welded on with all that heat, I assume they are not as flat as milled surface and there must be some amount amount tolerance that the bolt torque and gasket is designed to seal up.

Anyone know?

02-26-2016, 05:41 PM	#1
cc-rider Drives: 2010 Camaro SS Join Date: Dec 2006 Location: MN Posts: 1,182	What's the spec on header flange flatness? What is the generally accepted "flatness" spec for headers flanges? After all 4 tubes are welded on with all that heat, I assume they are not as flat as milled surface and there must be some amount amount tolerance that the bolt torque and gasket is designed to seal up. Anyone know?