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Original Message
About the strength of the bolt...
By Dave Shoe - 12/09/2001 7:40:52 PM; IP 12.2.11.131
...I think I now recognize you believe the hybrid bolt is stronger than the 3/8" bolt. I disagree.

I believe both the hybrid bolt and the 3/8" bolt will come apart at the same stress levels. Since the thread appears to be the specific location of the greatest stress in this bolt design, it seems most likely that both bolts would likely be destroyed at the same torque (or tension levels), and the fracture would likely occur at the thread nearest the shank. The beefier 13/32 shank is pretty much a guaranteed no-break, but both bolts have a 3/8" shank, and ,should the thread somehow decide to hold together at a stress level which would fracture a 3/8" shank, each bolt would still break.

Add in the possibility that the hybrid bolt may have been tightened crooked in the hole (maybe this is not possible, I don't know), then the 3/8" bolt would likely outlive the 13/32" bolt.

Hey, the hybrid design was a cost-saving business decision made by ARP management, under guidance of engineering, and at the request for parts from FE enthusiasts. They didn't see a need to tool-up for an expensive 13/32" thread, so they stuck with the hybrid 3/8-13/32 design. Maybe someone should contact ARP about their test findings, as it might shed some good light on the subject.

ARP is definitely more enthusiast friendly than SPS. I've called SPS a couple times and always got the paranoid "top secret need-to-know" kind of runaround that never got me anywhere toward finding what they had to offer. I'd bring up the idea that I was looking for info on some common automotive bolts they manufactured for the general public, but they seemed to think I was trying to pry out Ford secrets or something.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=9868&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9868" onclick="return false;">New 13/32 connecting rod bolts?!?</a>&nbsp;-- <font color=#0000ff>Joshua Carroll, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9868', contentMargin: 60, icon: $('anchor9868') }); </script>  New 13/32 connecting rod bolts?!? -- Joshua Carroll, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9871&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9871" onclick="return false;">RE: New 13/32 connecting rod bolts?!?</a>&nbsp;-- <font color=#0000ff>Mike McQuesten, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9871', contentMargin: 60, icon: $('anchor9871') }); </script>  RE: New 13/32 connecting rod bolts?!? -- Mike McQuesten, 12/07/2001
 RE: New 13/32 connecting rod bolts?!? -- Joshua Carroll, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9876&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9876" onclick="return false;">I'd avoid the ARP bolts.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9876', contentMargin: 60, icon: $('anchor9876') }); </script>  I'd avoid the ARP bolts. -- Dave Shoe, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9880&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9880" onclick="return false;">RE: Now, I found out!</a>&nbsp;-- <font color=#0000ff>Mike McQuesten, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9880', contentMargin: 60, icon: $('anchor9880') }); </script>  RE: Now, I found out! -- Mike McQuesten, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9884&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9884" onclick="return false;">I think I may have started the bad rumors.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9884', contentMargin: 60, icon: $('anchor9884') }); </script>  I think I may have started the bad rumors. -- Dave Shoe, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9886&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9886" onclick="return false;">ARP bolts</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9886', contentMargin: 60, icon: $('anchor9886') }); </script>  ARP bolts -- Royce Peterson, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9891&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9891" onclick="return false;">Nope.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9891', contentMargin: 60, icon: $('anchor9891') }); </script>  Nope. -- Dave Shoe, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9913&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9913" onclick="return false;">RE: Nope.</a>&nbsp;-- <font color=#0000ff>Mario428, <i>12/09/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9913', contentMargin: 60, icon: $('anchor9913') }); </script>  RE: Nope. -- Mario428, 12/09/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9917&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9917" onclick="return false;">I stand by my bad opinion.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/09/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9917', contentMargin: 60, icon: $('anchor9917') }); </script>  I stand by my bad opinion. -- Dave Shoe, 12/09/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9919&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9919" onclick="return false;">RE: I stand by my bad opinion.</a>&nbsp;-- <font color=#0000ff>Chip Huffman, <i>12/09/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9919', contentMargin: 60, icon: $('anchor9919') }); </script>  RE: I stand by my bad opinion. -- Chip Huffman, 12/09/2001
 ARP PI/CJ bolts are a special design. -- Dave Shoe, 12/09/2001
Collapse <b>About the strength of the bolt...</b>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/09/2001</i></font>About the strength of the bolt... -- Dave Shoe, 12/09/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9930&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9930" onclick="return false;">RE: About the strength of the bolt...</a>&nbsp;-- <font color=#0000ff>Mario428, <i>12/10/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9930', contentMargin: 60, icon: $('anchor9930') }); </script>  RE: About the strength of the bolt... -- Mario428, 12/10/2001
 RE: About the strength of the bolt... -- Dave Shoe, 12/10/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9955&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9955" onclick="return false;">RE: Nope.</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/11/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9955', contentMargin: 60, icon: $('anchor9955') }); </script>  RE: Nope. -- Bob, 12/11/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9957&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9957" onclick="return false;">An FE forging can be drilled either way.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>12/11/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9957', contentMargin: 60, icon: $('anchor9957') }); </script>  An FE forging can be drilled either way. -- Dave Shoe, 12/11/2001
 I found a bolt science web page !! -- Paul C., 12/11/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9879&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9879" onclick="return false;">RE: New 13/32 connecting rod bolts?!?</a>&nbsp;-- <font color=#0000ff>Bob, <i>12/07/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9879', contentMargin: 60, icon: $('anchor9879') }); </script>  RE: New 13/32 connecting rod bolts?!? -- Bob, 12/07/2001
Collapse <a href=../ForumFE/reply.aspx?ID=9961&Reply=9868><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor9961" onclick="return false;">Valve Spring Cups and Rod Bolts!</a>&nbsp;-- <font color=#0000ff>Joshua Carroll, <i>12/11/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=9961', contentMargin: 60, icon: $('anchor9961') }); </script>  Valve Spring Cups and Rod Bolts! -- Joshua Carroll, 12/11/2001
 RE: Valve Spring Cups and Rod Bolts! -- Bob, 12/11/2001
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