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Rod bolt stretch gauges #1194195 03/09/12 09:14 PM 03/09/12 09:14 PM
Joined: May 2006 Posts: 253 Smithfield, Rhode Island Mulehead OP enthusiast
Mulehead OP enthusiast Joined: May 2006 Posts: 253 Smithfield, Rhode Island	Looking for a rod bolt stretch gauge on Jegs and Summit.Want gauge do you use?? 7111302-DSC06043.JPG (80 downloads) Ain't nuthin like a HEMI !

Re: Rod bolt stretch gauges [Re: Mulehead] #1194196 03/09/12 09:24 PM 03/09/12 09:24 PM
Joined: Dec 2004 Posts: 134 Closest Race Track W WH23H6 member
WH23H6 member W Joined: Dec 2004 Posts: 134 Closest Race Track	Bought mine from ARP .... real nice quality piece! Not sure if Jeggs or Summitt can get it...maybe go directly to the ARP website.. http://arp-bolts.com/pages/viewcatalog.shtml Page 96 in the ARP Cat.

Re: Rod bolt stretch gauges [Re: Mulehead] #1194197 03/09/12 09:40 PM 03/09/12 09:40 PM
Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey J jamesc master
jamesc master J Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey	i might catch some backlash on this one but imho any of these gauges come with junk indicators which is probably the most important part of the tool. fwiw i got this one off ebag and the seller has different offerings. it's cheaper and still a nice tool so with the difference in price you can buy a dial indicator worthy of the task. i also got lucky and picked up a brand new in sealed bag mitutoyo 1-2 digital point mic for a steal to measure the bolt free length. i would not use any indicator made in china for this operation. it can also be advisable to modify things to increase spindle pressure for accurate readings. stretch gauge

Re: Rod bolt stretch gauges [Re: jamesc] #1194198 03/10/12 03:20 PM 03/10/12 03:20 PM
Joined: Jan 2003 Posts: 3,505 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,505 DFW	Quote: i might catch some backlash on this one but imho any of these gauges come with junk indicators which is probably the most important part of the tool. fwiw i got this one off ebag and the seller has different offerings. it's cheaper and still a nice tool so with the difference in price you can buy a dial indicator worthy of the task. i also got lucky and picked up a brand new in sealed bag mitutoyo 1-2 digital point mic for a steal to measure the bolt free length. i would not use any indicator made in china for this operation. it can also be advisable to modify things to increase spindle pressure for accurate readings. My machinist that did my Hemi rods used a Mitutoyo digital indicator that read out in .0001" increments and stretched the rod bolts to exactly .0070". I'll have to upgrade my stuff when I go to put things together to get the same stretch. Floyd Lippencott IV

Re: Rod bolt stretch gauges [Re: mr_340] #1194199 03/10/12 03:27 PM 03/10/12 03:27 PM
Joined: Aug 2003 Posts: 43,251 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,251 Bend,OR USA	My machinist that did my Hemi rods used a Mitutoyo digital indicator that read out in .0001" increments and stretched the rod bolts to exactly .0070". I'll have to upgrade my stuff when I go to put things together to get the same stretch. I like to split the stretch in the middle, if it calls for .0057 to .0062 I shoot for .0059 to .0060 you really should record and check the free lenght each time you take the tension ff of the bolts, trow thema away if they execeed (stretch) mare than +.0010 from original Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Rod bolt stretch gauges [Re: Cab_Burge] #1194200 03/10/12 04:20 PM 03/10/12 04:20 PM
Joined: Jan 2003 Posts: 3,505 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,505 DFW	Yep, did that. Manley says the stretch should be .0069"-.0073". Not quite in the middle, .0071" would have been the middle on the ARP2000 bolts. Here is a list of dimensions on the bolts out of the box(es). New ARP Bolts Manley P/N 42391-1 Out of Box Checks Blue Bolts Red Bolts Rod # Thread Diameter Shank Diameter Thread Diameter Shank Diameter A 0.4320 0.3705 0.4313 0.3711 B 0.4314 0.3711 0.4310 0.3708 C 0.4312 0.3711 0.4313 0.3708 D 0.4307 0.3711 0.4314 0.3709 E 0.4315 0.3715 0.4309 0.3712 F 0.4304 0.3710 0.4303 0.3709 G 0.4317 0.3711 0.4312 0.3708 H 0.4307 0.3710 0.4307 0.3706 Cut for Wt. Reduction Free Length Hardness Free Length Hardness A 2.2204 44.0 2.2201 45.5 B 2.1650 45.5 2.1506 44.5 C 2.1842 47.0 2.1823 46.0 D 2.2453 45.0 2.2473 46.0 E 2.1654 44.5 2.1668 46.0 F 2.1465 45.5 2.1364 46.5 G 2.1483 47.0 2.1402 48.0 H 2.2460 49.5 2.2265 45.5 .0070� Stretch all bolts Floyd Lippencott IV

Re: Rod bolt stretch gauges [Re: mr_340] #1194201 03/10/12 05:48 PM 03/10/12 05:48 PM
Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio dartman366 I Live Here
dartman366 I Live Here Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio	I bought a Jegs house brand rod bolt stretch gage and immediately took it to work and had it run thru the calibration lab,,,guess what,, dead nuts thru the range, while not quite as nice as a lot of others it fit my purpose of doing this once every few years,,if I did this for a living then I would invest in a top notch checker. Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.

Re: Rod bolt stretch gauges [Re: dartman366] #1194202 03/10/12 07:44 PM 03/10/12 07:44 PM
Joined: Jul 2010 Posts: 2,091 Delray beach, Florida P Performance Only top fuel
Performance Only top fuel P Joined: Jul 2010 Posts: 2,091 Delray beach, Florida	i've got several different brands, ARP, Proform, BHJ, not sure what else. they all work just fine and they all read the same on the same bolt. machine shop owner and engine builder

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