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Caution on extrude-honing manifolds

From: Daven Anderson
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Date: May 26, 2002


Extrude-honing of those 'log' manifolds that came on the polys STILL won't make them flow nearly as well as even later (unhoned) factory 4-into-1 exhaust manifolds as the A/B Magnums and 426 Hemi designs (none of these fit the polys). Also, extrude honing can weaken the manifold even if done with proper care.


Last changed: July 19, 2018