I don't post very much, but I thought I would ask you guys A few questions. I have a new World Iron block and I remember some thing about the main studs in the early ones not being ARP material. These studs have no markings on the stud. The nuts are marked arp, if they are not real does anyone have the P/N for the stud kit for the world block From ARP.Sorry for being so long.

If I remember correctly they had ARP nuts but the studs weren't ARP, but that's just memory from a few years ago.

I can't remember if anyone provided a way to determine if the studs were ARP or now...

Thanks Wade, I finally found a p/n on ARP's website. I'm just going to change them and be done with it's not worth taking a chance and this block get hurt over it. Thanks Again

the bad studs like in my aluminum block was funny looking, they looked like they was machined instead of rolled, like there was a shoulder where they stopped threading, and there was a spot on the end where it wasnt thread

i never used them since i bought the block, the previous owner may have used it.

good luck

ARP 145-5603, I had to go thur 10 pages, the search was nothing that made sense to me. So any that has a world block write that number down for later it will save a lot of time looking.

The original thread discussing the main stud issue.

https://board.moparts.org/ubbthreads/show...rt=all&vc=1

From the thread,

Quote:

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ARP 145-5603 stud kit for mains.

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