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ARP Rod Bolt Clearancing
https://slantsix.org/forum/viewtopic.php?t=67012		 Page 2 of 4
Author:  Exner Geek [ Sat Jan 14, 2023 7:25 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Before there was ARP we used to use Mopar Performance 340 rod bolts and as i remember they were interchangeable. Before ARP listed bolts for the slant 6 we used to use their 340 bolts and I don't remember there was any machining required.
Author:  hyper_pak [ Sat Jan 14, 2023 7:35 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Same here Seymour. They drop in.
Author:  CNC-Dude [ Sat Jan 14, 2023 7:41 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
If that's the case, I wonder why they chose to use the GM rod bolt as an answer instead of using the 340 bolt that they also were making at the time since it seems to work better?
Author:  hyper_pak [ Sat Jan 14, 2023 8:43 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
That is an excellent question!
Inquiring minds want to know.
Author:  slantzilla [ Sat Jan 14, 2023 9:30 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Mike always used ARP kits for the 340 too. They were actually cheaper than the Slant 6 set. Plus, after you did 3 sets of rods you had a 4th set for free.
Author:  CNC-Dude [ Sat Jan 14, 2023 11:23 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Back in the early 80's before ARP was such a big name, there were several other options for premium race quality fasteners. B&B was one and so was SPS. Both offered bulk pricing that was cheaper than package prices. Milodon is a good option as well
Author:  drgonzo [ Sat Jan 14, 2023 2:44 pm ]
Post subject:  Re: ARP Rod Bolt Clearancing
I ran SPS bolts in my SBC race engines back in the day. Never a bottom end issue in those old hobby stock engines. Is SPS still around?
Author:  Rick Covalt [ Sat Jan 14, 2023 4:07 pm ]
Post subject:  Re: ARP Rod Bolt Clearancing
I likely will not put any ARP bolts in stock rods again. It would be my guess if we keep rpm's below 5500 or so the stock ones are fine.
Author:  DadTruck [ Sat Jan 14, 2023 7:10 pm ]
Post subject:  Re: ARP Rod Bolt Clearancing
Quote:
They drop in.
Back in my working days, I never specialized in fasteners to be able to say that is an expertise, however no matter what components one was responsible for, fasteners came in to the discussion, from time to time.

Concerning rod bolts, I remember that the shank (that is the section from the bolt under head to the threaded section) of the bolt was always a press fit into the rod end. The purpose of the press fit was to constrain the rod bolt, so it was held in place for ease of assembly and also to limit as much as possible bending of the rod bolt shank ( the area from the underhead to the start of the threads). The movement of the threaded bolt diameter area at the rod cap was controlled by the bolt torque (clamp load) and the basic strength of the bolt.

Making this comment as the press fit of the rod bolt into the rod is very critical. The tight fit basically makes the lever of the movement shorter. A rod bolt that 'drops in to the hole" will have a potential for movement that can put shear stress at the shank near the underhead of the rod bolt.

Rod bolts are among the most highly stress fasteners in an engine. The shorter one can make the bolt, buy constraining the shank, the more robust the bolt will be.

I would be leery of any rod bolt that "drops into the hole."
Author:  Killer6 [ Wed Jan 18, 2023 9:39 pm ]
Post subject:  Re: ARP Rod Bolt Clearancing
Quote:
Just saw this on Facebook:

Below is an email response from ARP concerning their rod bolts. Just wanted to share so people are aware that that ordering rod bolts is a waste of time.

“unfortunately we have part 142-6001 on hold. R&D is retesting this kit. , im thinking it could be a fitment issue. There is no ETA when this kit will be back in stock.

if you can provide dimensions of the old rod bolt you have, maybe i can see if another rod bolt will work , i attached a pdf , just fill in the blanks and email back to me please.”
There are/were (2) different ARP rod bolt part #'s, 142-6001 & 142-6002, they have distinctly different head styles.
Author:  Dart270 [ Thu Jan 19, 2023 3:41 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
One is supposedly for cast crank rods and one for forged crank rods.

Now that this discussion is in process, I am wondering if Bob Dally's Bonneville Barracuda used these bolts in his 170s and caused 1-3 engine failures due to thrown rods and/or bearing failures. It is too bad that ARP did not do their homework on this.

Lou
Author:  hyper_pak [ Thu Jan 19, 2023 6:37 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Lou, Bob's Barracuda threw the little end if I remember correctly.
Number 1 or 2.
I have never seen that before.
Wish I had snapped a picture of it.
Author:  Dart270 [ Thu Jan 19, 2023 7:25 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Interesting. Never heard of that either. He had other bearing problems besides that time, and I know his oil pressure was low when I got there and it decreased after some dyno pulls.

Lou
Author:  Charrlie_S [ Tue Mar 21, 2023 2:41 pm ]
Post subject:  Re: ARP Rod Bolt Clearancing
Not a current thread, but I just checked a stock 318 rod bolt against a forged crank stock slant six rod bolt, and I cannot see any difference. I would think the ARP bolts for a 318 should work for the slant.
Author:  Greg Ondayko [ Wed Mar 22, 2023 6:33 am ]
Post subject:  Re: ARP Rod Bolt Clearancing
Quote:
Not a current thread, but I just checked a stock 318 rod bolt against a forged crank stock slant six rod bolt, and I cannot see any difference. I would think the ARP bolts for a 318 should work for the slant.

Good Show Charrile, Probably also the 340/360 Bolts too?

I would *think* all of the LA Bolts are the same?

Greg
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