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Old 09-02-2017, 02:26 PM   #8
kwmech
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,391
Re: 454 ARP and exhaust manifolds

The Dorman manifolds are already pretty thin without grinding on them, that's why I went the other way. And yes the plugs are the air injection holes. All the replacement manifolds are universal, even down to the O2 sensor hole.
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