[DeTomaso] Another header question: bolts

[Rich]

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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