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Author Topic: head studs for 400-450whp  (Read 312 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.

Online 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
Nitrous is like a hot chick with STD'S...You know you wanna hit it but your just not sure of the consequences.

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

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.

Online 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)?

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).

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.

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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)?

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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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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.