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12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Head stud confusion

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Old 01-05-2016, 06:46 PM
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Default Head stud confusion
Have a guy telling me arp 625s are 12mm studs.. aren't 426s 12mm and 625s are 14mm.
 
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Old 01-05-2016, 09:55 PM
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Nope. They are both the same. Standard 12mm size. 625 plus made 14mm studs obsolete
 
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Old 01-06-2016, 12:40 AM
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So just strength is the differents between the 426s/ 425s( whichever is the last correct digit) and the 625 12mm??
 
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Old 01-06-2016, 06:34 AM
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Yup, like an extra 100,000 psi tensial strength. As well as 625 are like a stainless material and they don't stretch apparently.
 
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