Rod bolt stretch

[flyinlow]

My connecting rods have ARP 2000 bolts.  You can torque them with ARP lube and a torque wrench or tighten them until they stretch the prescribed amount. Apparently this is a more accurate way .They make a gauge to do this but I do not have one. My 2-3 micrometer measures them. Has anyone tightens theirs this way?

[justcruisin]

I don't know if I would use a micrometer without the proper attachment for the bolt. The bolts have centering holes for that reason, the flats on the micrometer may not sit properly. I would be using a torque wrench and an angle gauge. You should have those specs with the bolts.

[Challenger340]

Your goal should be repeatability.... to recreate the Ft/Lbs of Torque applied to the Rods when they were ReSized... so as the Big Ends stay Straight & Round on the correct size same as when they were Resized.
Even small (5 ft/Lb differences) in Torque from the Torque used when they were ReSized can distort the Big End Size and yield poor results.
Follow the Ft/Lbs Torque recommendation supplied from whomever last ReSized the Big Ends, and use a Sunnen AG300 Gauge to check Straight/Round and make sure your Torque Wrench is applying that same load. This should have been done by whatever Machine Shop(using an AG300 Gauge) checked your Stroker Kit for you to determine what Torque makes the Rod Big Ends Straight & Round "On Size" again ?

As supplied.... the ARP2000 Fasteners are nowhere near the .0065" stretch under the probable 75-80 Ft/Lbs Rec'd load.(you need a special Rod Bolt Stretch gauge for this) and that spec is more often supplied as merely a check for later "re-check" in service of fastener fatigue than anything else.
Just say'in....
as supplied... the ARP2000 is not a "Torque to yield" fastener, rather you should be trying to apply the same Torque as when the Rod Big Ends were ReSized to make them straight & Round.
again.....
your goal at this point should be to recreate the load applied from whomever last ReSized the Big Ends... and was present during the Big Ends ReSizing process for repeatability of the correct Big End SIZE straight & Round.

This is why it's nice to be working with a 'blueprinted' Machine Pkg Stroker Kit.... rather than just winging it with some store bought/delivered Kit from where-ever.
People believe that an "as delivered" Kit should be 'good to go' right ?
FORGET IT !
What Vertical Bearing Clrc you have is dependant upon Torque/distortion applied to the Rod Big End ?
What Pin-Fit is present in the small end of the Rods ? in the Pistons ? who knows right ?

All I know is that if you try and apply sufficient Torque at this point attempting to get those ARP2000 Fasteners to prescribed 'stretch'  ?
I can almost GUARANTEE you will distort the Rod Big Ends and they will NOT come back requiring Rod ReSizing once again !

[Challenger340]

WHERE did you purchase this Stroker Kit ?
WHAT checks were performed on the Stroker Kit at your local Machine Shop ?
and
WHAT instructions/Torque and Machining Specs(ie: Pin Fits, Brg Clrcs @ Torque etc) were supplied by the Machine Shop ?

Please don't tell me you bought the pre-balanced Stroker Kit and then took a Block ONLY to the Machine Shop for Boring/Honing to the Pistons figuring the rest should be 'good to go' ?

They are NOT !

ALL Stroker Kits should be delivered WITH your Block to your Machine Shop(familiar with blueprinting) for Inspection/Checking/Pin-Fitting/Brg Clrcs @ Torque Specs..... then supplied to you 'good to go' for assembly.
NO 'farm implement' NAPA type store Machine Shops allowed !

[flyinlow]

440 Source Kit, Yes balanced by them. Balance card included.

Two 440 blocks wear dropped off for cleaning and sonic tests. Block checked for line bore , the one we used did not need it, the other did. The one used had a foreign object damage toward the bottom of #4 cylinder. It cleaned up at + .025" in prep for a .030" over kit. When the kit arrived I left the pistons ,crank and  camshaft at the machine shop. I checked the journal size and Checked the runout using an extra block . No apparent crank run out. I measured .0005 " taper on the #5-6 pin. The machine shop said the crank and and cam where straight and the taper on the #5-6 was .0003" .

Main clearance  .0025- .0028" side clearance on thrust .004" will re check installed.
Rods clearance   .0024 -.0027"

440 Source instructions say ARP Lube on the head and treads and torque to 70 Ft. LBS on the rod bolts

I watched a video of torqueing a rod bolt with the rod in a rod vise and checking the stretch . I guess as a secondary check for the clamping force. Do it a second time and check for constancy.

[Challenger340]

440 Source Kit, Yes balanced by them. Balance card included.

Two 440 blocks wear dropped off for cleaning and sonic tests. Block checked for line bore , the one we used did not need it, the other did. The one used had a foreign object damage toward the bottom of #4 cylinder. It cleaned up at + .025" in prep for a .030" over kit. When the kit arrived I left the pistons ,crank and  camshaft at the machine shop. I checked the journal size and Checked the runout using an extra block . No apparent crank run out. I measured .0005 " taper on the #5-6 pin. The machine shop said the crank and and cam where straight and the taper on the #5-6 was .0003" .

Main clearance  .0025- .0028" side clearance on thrust .004" will re check installed.
Rods clearance   .0024 -.0027"

440 Source instructions say ARP Lube on the head and treads and torque to 70 Ft. LBS on the rod bolts

I watched a video of torqueing a rod bolt with the rod in a rod vise and checking the stretch . I guess as a secondary check for the clamping force. Do it a second time and check for constancy.

First off.... how are you checking/arriving at those Bearing Clearances ? what procedure is being used ?

* If you are installing Main Studs ?....  I dunno if you are or not ? but the Block will require Line Honing to correct the Main saddles with Main Studs.

* what clearance were the Pistons and Rods Pin-fitted to ?

* how are you verifying the 70 Ft/Lbs applied on your Torque wrench....  is the same "load" as the 70 Ft/Lbs applied at 440 Source ?
That's why I was saying your goal should be 'repeatability' to ensure both Torque wrenchs are applying the same load.... by checking the Big Ends on a Sunnen AG300 gauge(Machine Shop)

and again here.... because 440 Source does NOT use 'stretch' when sizing the Rods
so there is NO WAY you should be actively TRYING to stretch the ARP2000 fastener to spec.... because that's NOT the way they were done at 440 Source and will NOT repeat a patent Big End Sizing from when ReSized.