Quick ARP bolt question
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 3,032
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Quick ARP bolt question
I searched the through archives, but couldn't find a definitive answer so...
For 1/4" flange headers, which would be best -
a 3/4" length bolt, or a 1" length bolt?
(stock, Iron headed L98, if that makes a difference).
For 1/4" flange headers, which would be best -
a 3/4" length bolt, or a 1" length bolt?
(stock, Iron headed L98, if that makes a difference).
Race Director
Joined: Sep 2000
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From: The Top of Utah
The longer the better. That makes for more friction (thread engagement) surface to help hold the torque. Stick a piece of wire in the hole to check for depth to see what will fit. It will be no less than 1". The strength of the bolt is unimportant. Grade 5 is plenty strong.
RACE ON!!!
RACE ON!!!
Thread Starter
Melting Slicks
Joined: Jun 2004
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Originally Posted by CFI-EFI
The longer the better. That makes for more friction (thread engagement) surface to help hold the torque. Stick a piece of wire in the hole to check for depth to see what will fit. It will be no less than 1". The strength of the bolt is unimportant. Grade 5 is plenty strong.
RACE ON!!!
RACE ON!!!
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
3/4" would be long enough with a thin flange and an iron head. But if you can use 1", why not? I love ARP bolts for critical applications and use them throughout my engine. But for headers, especially the Hedmans which I'm guessing you have, I'd recommend a stainless bolt with a 5/16" allen head. Even with a 3/8" hex head on a conventional header bolt, some of them are a PITA with the Hedmans.
Thread Starter
Melting Slicks
Joined: Jun 2004
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Originally Posted by Corvette Kid NC
I'd recommend a stainless bolt with a 5/16" allen head. Even with a 3/8" hex head on a conventional header bolt.
Originally Posted by Corvette Kid NC
especially the Hedmans which I'm guessing you have.
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by mikey whipreck
I was looking at SS bolts, but I can't find anything with a 5/16" allen head, do you have a part number for me to reference? The one I am looking at uses a 3/8" hex head (ARP-400-1210).
and yep.
and yep.
Thread Starter
Melting Slicks
Joined: Jun 2004
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Likes: 4
Originally Posted by Corvette Kid NC
Do you have a specialty bolt store in your area?
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by mikey whipreck
I have the standard assortment of generic autoparts stores, and home-depot style stores. However, I've never looked for anything like that... I'll hafta search.
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Le Mans Master
Joined: Jun 2002
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From: High Plains Drifter Fayetteville, AR
Local bolt shop should be listed under bolts, fasteners, or industrial supply. And I would also recommend you get the 3/8"x16 with a 5/16" socket head capscrew. I have 3/8"x16 with a 3/8" socket head capscrews and on some of the locations I had to use a hex-head bolt because the 3/8" socket head was too big or there wasn't enough room to get the allen key in there, even with a ball end.
I picked up all my fasteners at the local bolt store for the rediculous price of $4 and change, lol. No need to drop $30 on ARP header bolts. I would also recommend you get stainless if you can. I've had mine in for just over a year and the black oxide is now a bright red oxide, lol.
I picked up all my fasteners at the local bolt store for the rediculous price of $4 and change, lol. No need to drop $30 on ARP header bolts. I would also recommend you get stainless if you can. I've had mine in for just over a year and the black oxide is now a bright red oxide, lol.
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by JCAIRE2
Local bolt shop should be listed under bolts, fasteners, or industrial supply. And I would also recommend you get the 3/8"x16 with a 5/16" socket head capscrew. I have 3/8"x16 with a 3/8" socket head capscrews and on some of the locations I had to use a hex-head bolt because the 3/8" socket head was too big or there wasn't enough room to get the allen key in there, even with a ball end.
Le Mans Master
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From: High Plains Drifter Fayetteville, AR
Originally Posted by Corvette Kid NC
This where you cut off the short end of an allen wrench until it will get in there. Adapt, improvise and overcome!
Large Impressive Member
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by JCAIRE2
I couldn't get it to work with my Lingenfelter headers. Had to resort to some 3/8" hex head bolts. The 3/8" socket head was rubbing up against the primary and I couldn't even get it in. On a couple other primarys, they were so dimpled, that I could not angle the allen key in there, no matter how I cut it. It worked out for me though, all the bolts are equally rusty now, so you don't even notice that some are hex and some are capscrews, lol.