Anyone using anything other than the factory head bolts? On my last three turbo's I always sooner or later turn up the boost to high for some stupid reason and lift the head and burn an o-ring. My pro it ended up at 15 lbs at 1500 ft, it llasted a while but it did start to push out a littl anitfreeze later on. I found that ARP makes 180,000 psi bolts instaed of the factory 150,000 bolts. Just FYI
Different head bolts?
- Thread starter allblowdup
- Start date
bolts
who sells them?
who sells them?
C
Cody Phillips Racing
Well-known member
Are you thinking of running a bolt or a stud?
There is no stud available in that size from them that I could find. Also the water neck may not allow a stud and nut without modification so I went with there stainless 300 series bolts 180,000 psi. Another thing that I found out from running high boost at low elevations is that the factory head is not up to the task either. On the intake side between the two head bolts that have the water passage throught it the head gets pushed up. Mine was at least .005 right between the bolts. Better bolts wouldn't help that one. So big boost + low elevation = a billet head of some sort.
C
Cody Phillips Racing
Well-known member
Yeah I've been searching for a head stud/head bolt combination for quite a while now. I'll be offering a stud kit in the near future, we're currently mic-ing everything out on the engine. I too blew the o-rings out of my sled at 18 psi last year. Sled was definitely not detonating, it's just too much power for the factory grade 8 hardware and once they stretch a little bit it'll push the coolant 
Cody... any progress on the Stud kit?
How will you seal the coolant from weeping around the threads...Acorn style nuts?
Is it really the bolts stretching or could it be simply that the stock head is deforming under higher boost?
Were you running a stock cast head cover at 18lbs boost or an aftermarket billet heat? If so...which one?
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How will you seal the coolant from weeping around the threads...Acorn style nuts?
Is it really the bolts stretching or could it be simply that the stock head is deforming under higher boost?
Were you running a stock cast head cover at 18lbs boost or an aftermarket billet heat? If so...which one?
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C
Cody Phillips Racing
Well-known member
Here's what I ended up going with guys. 14lbs of boost on the map sensor so likely around 17-18 on a boost gauge and holding up perfectly. Email me at cody@codyphillipsracing.com if interested in purchasing.
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Those look like the ones on Wursten's big bore CR-500.
NICE!!
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NICE!!
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sorry guys been super busy. got on here to answer some questions.
yes these are studs and nuts in the pic. you will have to mod your coolant intake 90 with the tall acorn nuts. or cut the stud to fit just right.
we have these in stock and can ship them out.
they will fit the liberty twins. anything with a m8x125 thread.
i can also get.
stainless bolts that are like stock and titanum of wanted.
yes these are studs and nuts in the pic. you will have to mod your coolant intake 90 with the tall acorn nuts. or cut the stud to fit just right.
we have these in stock and can ship them out.
they will fit the liberty twins. anything with a m8x125 thread.
i can also get.
stainless bolts that are like stock and titanum of wanted.
