ARP "Revised" rod bolts. Thoughts?

[Exclusivs]

Just came upon this, maybe it's old news:

https://www.turnermotorsport.com/p-2...3-new-revised/





ARPs got a tremendous amount of experience in the engine world. I'd like to learn more about these! (If they are in fact a new release)

It seems to me; by this time of the e9x M3 cycle there would be handful of members logging oil analysis on newly installed rods/bearings of choice.

[oolas3]

The bolts were never an issue. In fact the OE bmw bolts work fine as well but it increases install times.

[Helmsman]

201-6001 are the so called aged 625s. Used them with ACL HX shells on mine last year. "Too good" according to some who push ARP-2000 instead.

[Green-Eggs]

When we can't get BE-ARP, we use ARP-625. It's a great bolt...but pricey. But now the price has come way down...but still about 50% higher than BE-ARP.

[Exclusivs]

Cool! So they're not newly released...

Thanks for the insight on them. They look great - when time comes to do the work they'll be high on the list.

[GORDON.M3]

ARP2000 is fine for the application that we use it for. I don't see any problems with it from a material and strength standpoint and there is no evidence leading to the fact that it has caused any harm in terms of adding wear to the rod bearing issue on hand.
Installation accuracy and torque wrench calibration are more of a priority than anything when having the rod bearings replaced. Age 625 Plus is nothing new and just another great alternative if you can't get the BE + ARP or VAC + ARP combo.

[deansbimmer]

The bolts in the Turner link are just repackaged ARP625 as evidenced by their 201-6001 PN. So you're paying about $50 more for them because they repackaged them and make them sound like something new and unique.

Our shop also uses the 201-6001 625 bolts when the BE bolts run out. We prefer the BE bolts to keep the cost down for the customer. The 625 bolts were once rumored to cause significant bore distortion but that's not the case after testing proved them quite acceptable. ARP knows how to make hardware.

As mentioned, most important is to install properly- with calibrated torque wrench and not too much (or too little) lube.

[charliev68]

Does anyone know the weight of 625+ bolts compared to OEM BMW bolts? I know that VAC and BE versions are lighter.