Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/Head Bolt/Stud Options?
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260DET: (2010-02-11 03:52:54)
To use with a conventional type head gasket, no O rings. Looking at the number of bolts per head I'm thinking ARP prices should not be necessary, studs may be better if the heads can be removed with the engine still incar.
So what are the recommended options for say 500 WHP? Don't want to be marginal with this but don't want to waste money either. Then again I bet the OE bolts are not cheap.
1SickZ: (2010-02-11 09:12:06)
From my experience oem bolts work great to 500-550 after that i'd advise arp studs. If you search this section for arp you will find the arp info.
michaelp: (2010-02-11 16:04:22)
Think, or someone with experience?
NissanXRMA: (2010-02-12 01:09:59)
That doesn't mean anything.
300zxturboftw: (2010-02-12 13:51:10)
I know some people are running around 450 rwhp with OEM head bolts. Might as well just run ARP and not have to worry about it at your power level goals.
260DET: (2010-02-13 03:16:35)
Thanks to all who contributed, looks like a set of ARP from Z31parts would be the way to go.
SATAN: (2010-02-13 06:10:11)
I blew OEM gaskets with OEM bolts torqued to factory specs somewhere around 550whp also. That is with an O-ringed block.