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Author Topic: head studs for 400-450whp  (Read 6229 times)

Offline Thomas

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head studs for 400-450whp
« on: October 09, 2017, 07:14:01 AM »
Will APE head studs / nuts do?

I'm going to drop head studs / new head gasket and a spacer for now for low boost, and later (in a year or so) rebuild the engine to get about 400-450whp.
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Offline RansomT

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Re: head studs for 400-450whp
« Reply #1 on: October 09, 2017, 07:36:43 AM »
That's what I run in my nitrous bike (and my HC all motor bike) and haven't had any issues.  The nitrous bike is in that 400-450 range.
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Offline wildphil69

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Re: head studs for 400-450whp
« Reply #2 on: October 09, 2017, 10:10:06 AM »
They will do. If you plan on pushing further you may want to look at the 1/2" studs
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Offline Thomas

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Re: head studs for 400-450whp
« Reply #3 on: October 09, 2017, 08:44:02 PM »
Any machining needed? I see that ARP's have few first threads cut to keep block and cylinder walls from deforming under load
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Offline wildphil69

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Re: head studs for 400-450whp
« Reply #4 on: October 09, 2017, 09:53:43 PM »
The oem size are direct fit the 1/2" require machining
Nitrous is like a hot chick with STD'S...You know you wanna hit it but your just not sure of the consequences.

Offline Oz Booster

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Re: head studs for 400-450whp
« Reply #5 on: October 10, 2017, 02:58:39 AM »
I am trying an 11mm stud next week, same pitch as the 10mm so i hope to just chase the thread with the new size , and simplify the upgrade and end up with the correct stretch at ~72ft lbs
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Offline Thomas

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Re: head studs for 400-450whp
« Reply #6 on: October 10, 2017, 08:20:59 AM »
Are you using custom studs or are you using studs for some other engine (maybe with minor mods)?
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Offline Thomas

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Re: head studs for 400-450whp
« Reply #7 on: October 10, 2017, 09:02:12 AM »
The oem size are direct fit the 1/2" require machining
That's clear. I was wondering if there a point of doing something like you see on the attached picture to keep block from deforming too much (few threads are cut on the right side of the studs).
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Offline wildphil69

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Re: head studs for 400-450whp
« Reply #8 on: October 10, 2017, 11:49:50 AM »
That is so the stud can bottom out into the case.
Nitrous is like a hot chick with STD'S...You know you wanna hit it but your just not sure of the consequences.

Offline Oz Booster

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Re: head studs for 400-450whp
« Reply #9 on: October 11, 2017, 01:25:00 AM »
Are you using custom studs or are you using studs for some other engine (maybe with minor mods)?

Upgrade studs for EJ20 and EJ25 Subaru , right length and pitch
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Offline Thomas

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Re: head studs for 400-450whp
« Reply #10 on: October 11, 2017, 10:22:49 AM »
Awesome info. Thanks for sharing! Keep us posted.  :thumb:

BTW it's still not 100% clear to me. Should I machine the ends of APE studs? It's basically a 15 min job and I have free access to a lathe.
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Offline gsxrdan

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Re: head studs for 400-450whp
« Reply #11 on: October 11, 2017, 03:08:15 PM »
I have ape 10mm in one engine and 1/2" bolts in another. 10mm gave no issues with 14-20 lbs . I'm putting 30 lbs to my 1/2" with no issues. I'm going to try 10mm arps this time.