[DeTomaso] Another header question: bolts

Sun Dec 28 20:09:33 EST 2008

One of the best parts about studs is you KNOW you have the nuts on right.
The way the ARP studs are designed, it's virtually impossible to cross
thread.

The worst thing is the price - about $57 for the set (from memory).

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Kirby Schrader
Sent: Sunday, December 28, 2008 6:49 PM
To: Charles Engles
Cc: detomaso at realbig.com; Rich
Subject: Re: [DeTomaso] Another header question: bolts

I have aluminum B351 heads on my GT40. Studs are the ONLY way to go,  
but a real PITA with 180's.
Bolts will gall, in my experience, no matter what type they are; no  
matter whether you use anti seize or not. Especially with the SS bolts.

Mess up the threads in the heads and you'll need helicoils.

FWIW,
Kirby

On 28 Dec 2008, at 6:01 PM, Charles Engles wrote:

> Dear Rich,
>
>
>               Alas, the research budget for the Engine Department  
> does not
> cover aluminum!    I am still with iron heads and can't say.
>
>                         Warmest regards,   Chuck Engles
>
>
>
> ---- Original Message -----
> From: "Rich" <hoppe1 at cox.net>
> To: <MikeLDrew at aol.com>; <cengles at cox.net>; <detomaso at realbig.com>
> Sent: Sunday, December 28, 2008 5:56 PM
> Subject: Re: [DeTomaso] Another header question: bolts
>
>
>> On the subject  of header bolts.    Do you do anything different for
>> aluminum heads?  Studs?
>> ----- Original Message -----
>> From: <MikeLDrew at aol.com>
>> To: <cengles at cox.net>; <detomaso at realbig.com>
>> Sent: Sunday, December 28, 2008 4:39 PM
>> Subject: Re: [DeTomaso] Another header question: bolts
>>
>>
>>
>> In a message dated 12/28/08 15 07 26, cengles at cox.net writes:
>>
>>
>>> On the topic of header bolts, does anyone have an opinion
>>> about either Percy's Split Lock header bolts or the Stage 8 Locking
>>> header
>>> bolts?
>>>
>>
>> I've seen the Stage 8 bolts, and they seem pretty neat, although I  
>> think
>> they
>> require a bit too much fiddling around, and of course since you  
>> need to
>> tighten header bolts after the engine has been through a couple of  
>> heat
>> cycles,
>> that requires a lot more work.
>>
>> Personally, I am advocate of ARP small-head header bolts.   These are
>> special
>> bolts made with a smaller-than-normal 5/16" head (rather than the  
>> more
>> conventional 3/8").   You wouldn't think that a lousy sixteenth of  
>> an inch
>> would
>> make a difference, but brother, I'm here to tell you that it  
>> does.   Some
>> headers
>> have the pipes exiting the flange at a slight angle, which can  
>> sometimes
>> interfere with your ability to place a wrench on the bolt head.    
>> What
>> follows is
>> an agonizing ritual of turning the bolt 1/32nd of a turn at a time,
>> constantly
>> having to flip the wrench to get even a slight purchase on the bolt  
>> head.
>>
>> These smaller heads make short work of this.   The additional  
>> clearance
>> can
>> be enough to let you get a box-end wrench in there, or a socket-- 
>> either
>> one
>> makes a huge difference.
>>
>> And they are ARP quality, nothing to sneeze at there.   Once the  
>> engine
>> has
>> gone through a couple of heat cycles, you'll need to go back and  
>> snug them
>> up
>> again, and then they should be good to go forever.
>>
>> Here's a photo from the Summit website:
>>
>> http://tinyurl.com/8dokeh
>>
>> Summit doesn't specifically list these bolts as 'small head', so I  
>> was
>> only
>> able to find them by first looking in my ARP bolt catalog for the  
>> part
>> number,
>> then typing that number in the 'search' box on the Summit website.
>>
>> These bolts are available in two lengths; either .750" or 1.00".    
>> My Euro
>> GTS headers (and the headers on my other cars as well) have fairly  
>> thick
>> flanges
>> so I always go for the longer bolts.
>>
>> They are available in either 6- or 12-point, black oxide or  
>> stainless.
>>
>> Part numbers:
>>
>> Bolt kit, 5/16" wrench, length .750
>>
>> Black oxide 6-point: 100-1108
>> Black oxide 12-point: 100-1208
>> Stainless 6-point: 400-1108
>> Stainless 12-point: 400-1208
>>
>> Bolt kit, 5/16" wrench, length 1.000
>> Black oxide, 6-point: 100-1110
>> Black oxide 12-point: 100-1210
>> Stainless 6-point: 400-1110
>> Stainless 12-point:   400-1210
>>
>> Entering any of those part numbers in the 'search' box will bring  
>> them
>> right
>> up on the Summit website.   Cost is $24.69 for the black oxide, 1- 
>> inch
>> six-point bolts.   Plus Summit charges a flat handling charge,  
>> which I
>> believe is
>> $11.95 now?
>>
>> I have actually found that it's cheaper to buy ARP bolts directly  
>> from the
>> factory.   If you call them up and tell them what you need, they  
>> just pop
>> 'em in
>> the mail to you, saving on shipping, and the retail price from them  
>> is
>> usually about the same or even a bit less?
>>
>> Contact info can be had on the 'contact us' link on the ARP website:
>> http://www.arp-bolts.com/
>>
>> Cheers!
>>
>> Mike
>>
>>
>> **************
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