Flow numbers for Big mouth manifold...
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
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Re: Flow numbers for Big mouth manifold...
Out of the box I would imagine somewhere around 240cfm. They open the ends up but not the pinch point.
Extrude Honed or opened up by hand you can get them up to 270cfm. With welding you can go higher.
Extrude Honed or opened up by hand you can get them up to 270cfm. With welding you can go higher.
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