Rod Bolt Type

[middleagecrisis]

I bought a 360 a while ago and am finally getting to the stage of putting it back together. I bought the motor disassembled from a shop that was swapping over to big block for the customer. The engine has forged pistons and appears to be internally balanced (heavy metal in crank & 318/340 internal balance style balancer). Is there any way to tell if the rod bolts in the picture are factory or aftermarket (ARP, etc)?

 

[Newbomb Turk]

If they don’t say ARP on them they aren’t.

I wouldn’t disqualify the rod bolts because they don’t say ARP on them.

The factory bolts were plenty good for 7000 and under.

 

[66fs]

They look like the old Direct Connection rod bolts. You can tell by the dimple to measure bolt stretch. They are good ones.

 

[Demonracer]

Why trust possibly 50 year old rod bolts, bite the bullet and grab some ARP bolts for your own peace of mind.

 

[9secRR]

The factory bolts were plenty good for 7000 and under.

i found out at 7300 rpm they do not live.

 

[Newbomb Turk]

i found out at 7300 rpm they do not live.

lol I don’t doubt that. Most any 3/8 bolt and nut I’ve seen gets a 7k speed limit.

Go over that too many times and you *** gets bit.

 

[Dart Frog]

If you don't know the history and the quality of the rod bolt I would replace it. I have phone to write connection rod bolts in my 340 which I believe were made by ARP and they have a different marking on the top. They may be ARPs they're just different than mine

 

[66fs]

Why trust possibly 50 year old rod bolts, bite the bullet and grab some ARP bolts for your own peace of mind.

It is the cycles, not time. That is why you measure the bolt stretch.