circlepilot
Well-Known Member
Are OEM connecting rod nuts rated at grade 8? (225/6)
But don't use hardware store grade 8 nuts (if that's your plan).. The flange design of con rod nuts is as important as the material/strength.
ARP makes nuts in various threads and are cheap enough to not mess with hardware store junk.
It was never my intention to use "hardware store nuts." I was trying to find some specifications on OEM nuts without much luck. In my application, I believe it is not necessary change my rod bolts, (however, I may just cave and spend the money for the new bolts and resizing the rods, est. $150.00) but would like to just change the nuts. The OEM nuts are not "flange nuts, which seems to be all that ARP has. Fastenal has a grade 8 3/8 24, yellow zinc plated nut, (made in China) which seems to be where all this stuff is coming from.
Norm
I'd like to know who their supplier was. I know that Chrysler did not make their own hardware.
I've rebuilt several engines over the years, have never replaced the rod bolts in any, never had an issue. But every engine I have been into has been run of the mill daily driver to this point.
On my current build my engine came to me as an incomplete basket case. I didn't get pistons or rods with it. I lucked into a set of NOS rods still in mopar boxes. I certainly ain't worried about replacing those rod bolts.
I have since changed my bolts out with the ARPs. I noticed that while I was pressing them in, on three of the rods, the head of the bolt (only on one side of the rod) left a little bit of a "rub mark" on the rod itself. All of the rods are at the machine shop being resized, balanced and the pistons installed. My crank shaft is being balance also.If you replace with the ARP slant bolts they are larger. They wont drop in without problems. That is why you need to resize them. Several people have lost engines after switching bolts. I have never had any trouble with DC Bolts.
Are you sure of this? What year did this take place? MP was famous for finding the cheaper supplier and sacrificed quality to do it.ARP made rod bolts for Mopar Performance.
Are you sure of this? What year did this take place? MP was famous for finding the cheaper supplier and sacrificed quality to do it.
my machinist said the worst rod bolts he ever saw were in a MP package, and don’t use them.
They came like this. My bad. It wasn't an ARP package, but the bolts had ARP stamped right on the heads. It has been some time ago. lol
View attachment 1715684553
Are you sure of this? What year did this take place? MP was famous for finding the cheaper supplier and sacrificed quality to do it.
my machinist said the worst rod bolts he ever saw were in a MP package, and don’t use them.
I replaced the rodbolts in a hemi superstock type engine w/ mopar bolts , didnt change anything , knocked them in w/ a hammer while holding the rod in my left hand.< tells you how tite they were .
That engine was raced for a lot of yrs. , and as far as I know are still in it -----------
I hit the agree button-I've done it many times with no ill effects. Everybody always recommends resizing the rods. Horse crap.