Thread: exhaust manifold bolt size
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Old 11-30-2016, 07:25 AM   #3
DjS71
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Join Date: Feb 2009
Location: Santa Rosa, CA
Posts: 267
Re: exhaust manifold bolt size
According to ARP's website, the replacements they sell are 25mm (.984") UHL for a 1/4" flange and 30mm (1.181") UHL for a 3/8" flange
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1971 C10 Short/Fleet 307-2BBL/3OTT
1999 Silverado 2500 ECSB 6.0/4L80
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