[63gpman]

Good enough for me. That was my thought earlier, but wanted to check.

[tempest1964]

So, let me see if In understand this right. ARP bolts have ARP stamped on them? Does ARP make 8740 grade and 2000 grade bolts? Just want to make sure. Bought some RPM rods off a guy on this site and realize I should verify my bolts. By the way, these are MaxxLite A rods.
Thanks,
Tony

[Tom Vaught]

ARP does make 8740 grade with no name on the fastener and they make ARP2000 fasteners with the name and number right on the head of the bolt.

ARP actually make 4 different 8740 grade bolts and depending on who made the connecting rod and bought the fasteners for the rods you could have a big spread in strength.

"You should also know that there are grades within specific alloys. For example, 8740 is available in four grades:

SDF (guaranteed seamless and defect free).
CHQ (cold head quality).
Aircraft.
Commercial.

ARP uses only the first two (SDF and CHQ), even though they cost more than double “Aircraft” quality. The first listing is better vs the bottom listing.

8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only MODERATE STRENGTH, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.

ARP2000®: ARP2000 is an alloy steel that can be safely heat treated to a higher level, producing a greater strength material than 8740. While 8740 and ARP2000 share similar characteristics – ARP2000 is capable of achieving a clamp load at 220,000 psi. ARP2000 is used widely in short track and drag racing as an up-grade from 8740 chrome moly in both steel and aluminum rods. Stress corrosion and hydrogen embrittlement are typically not a problem, providing care is taken during installation.

So that is why I will replace the fasteners in my old Eagle Rods with the ARP2000 stuff
when I use them.

The Maxx Lite A rods are probably the Rods ACE used to sell that were made in China and went for $400. They came with the basic 8740 bolts.

Tom V.

[tempest1964]

So ,for a street build 421 at 450 HP or less, the 8740's would be more than adequate? If not, new bolts and resize the big end? And thanks for the response Tom.

[Tom Vaught]

Your Welcome!

Tom V.