when to use APR head bolts - Ford Powerstroke Diesel Forum
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Old 12-03-2013, 04:35 PM
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when to use APR head bolts

When would it be a good idea to use APR head bolts on a 7.3? Each cylinder is surrounded by 6 head bolts the 6.0 motor 4. I am reading that's why 6.0 had head gaskets problmes. How much modifying can be made to a 7.3 before considering APR head bolts?
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Old 12-03-2013, 05:14 PM
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At some point, factory head bolts are just not going to cut it, no matter if you have 4 or 6. On a 7.3 you don't want to push past 40 psi occasionally, and no more than 35-37 daily.
So to answer your question, around 40 psi.
Also, if your pushing 40 psi ( which takes some doing) there is a host of other things to think about such as valve springs, pushrods, etc.
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Old 12-04-2013, 03:11 AM
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I thought somewhere around 70 psi you needed studs? Kause my Cali model tuned could get 37 easily and daily, just a time bomb or was it safe?
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Old 12-04-2013, 04:49 AM
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200cc injector or larger
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Old 12-04-2013, 08:31 AM
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I am below both psi and injector size.... thanks
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Old 12-04-2013, 09:24 AM
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If you have injectors and you pass 40 psi, its extra insurance to put them in. Their on my winter to do list, my combo has me touching 47 going down the track. So its time
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Old 12-04-2013, 05:13 PM
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anything past 35-40 it would be good insurance to go ahead and put them in.
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Old 12-05-2013, 05:55 AM
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We"re talking turbo boost correct? Would there be another instance where ARP would be a good idea?
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Old 12-05-2013, 06:18 AM
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The reason for studding the head is because of boost/compression, in some instances (especially with the 6.0) the boost will stretch the bolts and literally lift the head a bit and that's why people in high boosted applications go through head gaskets
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Old 12-05-2013, 06:29 AM
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Would adding a Snow methanol unit to the motor that's about 375 hp be one of those instances?
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