Like the title says, beware.

I Could not achieve a repeatable Torque Value on the Main Studs when Assembling a World Aluminum Block, then 1 Main Stud snapped in half !!
Some had seemed to be "stretching" excessively @ 100ft/lbs just prior to this ?
Upon removal and further inspection, I THEN noticed, that although the Nuts had "ARP" on them, the Main Stud Ends themselves DID NOT ?
Fooled me up until then !

A subsequent Phonecall to ARP, confirms ARP Studs do indeed have "ARP" on the ends.

I Removed the suspected "Chinese" studs, and found they were "stretched" visually thinner in areas on the threads, from the Rec'd 100ft/lb Torque applied.
Mic readings indicated many had indeed shrunk by .030" in Diameter at their weakest threaded points, and were also about to break !

CHECK your World Products Aluminum Blocks, and make sure your Main Studs themselves have "ARP" on the end, NOT JUST THE NUTS !

I will not comment on the phonecall I had with World Products !
however,
I am still unsure how NON-ARP Studs? get mated to genuine "ARP" Nuts as delivered from World Products?

Damn!

The studs supplied with the World blocks are absolute garbage. I recently had the same issue with several World iron blocks, and not the first one by any means. I could not get a good torque reading, and at first, it actually felt like it was the threads pulling out of the mains. After some testing, I actually set up a height micropmeter to see if indeeed if was what I had susepcted.The " World" studs ( which look like a turned stud, and not a rolled thread) stretched to about .007 , some a bit more! Thats a 1/2" supposed 220,000# stud! THEY ARE CRAP!

I changed all the studs out for ARP, including side studs and problem solved. There were several things that World could have done much better, thats for sure, and to sell those blocks with those absolutely horrible fasteners is a shame.

ARP makes a kit to change them out now.

Dang! I have a new iron World block I'm getting ready to assemble. I'll be checking the studs for the ARP stamp. If not stamped I'll be calling ARP to order a stud kit. Thanks for the heads up..

I guess the question is : Does World advertise the blocks as coming with ARP studs?

Also is the 100 foot Pounds their supplied torque value. If so, then whatever fastener is in that block should work at that torque value.

ANY TIME a fastener has that uneasy feeling when you are torquing it, you need to find out why! All fasteners should come up to torque and feel solid all the way.

Any resolution to this issue from World? I'm supposed to be paying for one here in a few days. NOT cheap. I would also like to know if anyone has anything to say, bad or good, about the cast iron hemi blocks.

FYI...

If you didn't see the post..

Keith Black is back up and running..

Best choice for aluminum block IMO..

https://board.moparts.org/ubbthreads/show...rue#Post6126321



Chris..

KB is TOP NOTCH. If I were in the market for an alloy block that's where my $$$ would be going. I'm doing a street/strip 64 Savoy hemi/4speed car this goround and am going CI for this hemi. Any opinions on the WP CI hemi blocks is appreciated.

For the guys with World blocks, are those putty studs the ones World has in when the mains are machined? I'd be those main journals REAL close....

Looking at the spec. sheet I got with my aluminum World block it says:Race blocks come with nodular iron main caps with all five caps being two bolt style with cross-bolts on the first four positions. All the main caps use 1/2"-13 studs. Torque spec. on main studs is 100 ft. lbs. with oil and 45 ft. lbs. on the cross bolts

This spec. sheet is generic as it covers both the aluminum and CGI blocks. Now looking in the catalog it says that all complete engines come with ARP internal hardware.
So do they change out the studs to build their crate engines or is this a isolated case? My block is at the machine shop so I can't look but he'll be getting a call for sure, so will World.

i too im putting a world block together. the studs are as described, arp nuts and what ever studs. maybe some one can post the arp main stud part numbers for the world aluminum block. also if any one has arp head stud kit part number for the world aluminum block with eddy victor heads.

ARP 145-5603 stud kit for mains.

Just curious Todd,are they 1/2 main studs or 9/16 like a Keith Black?

1/2

Great post!

i just got two world hemi blocks in,, iron,, first one i thought the studs were worn out cause they were mush when torquing them,, told the guy,, and put in arp... thought they were just used too much

then i got another motor in,, same studs,, has been apart and together twice,, im sure torqued up a few times in mocking up process,, they are soft.... then i read this,,, they just must be all crap

i was going to 105 with moly like i do with all 1/2 studs,, arp studs hit the number hard,,, the world studs either soft or i gave up cause i knew the stud was going to break


jeff

didn't Bill Mitchell/World try to dump those blocks real cheap like 3300.00 on ebay not long ago ?

unacceptable. this also throws into question the accuracy of the machine work after replacing the hardware.

After I wrote my HEMI book, I broke a World main stud while assembling an aluminum motor. I used an iron World block in the book and had no issues so I talked to the powers to be and they said they did indeed have issues with their stud supplier. But that was over a year back, and they told me that new blocks would use ARP studs.

Then about 4 months back I had another aluminum World HEMI block delivered and it had all ARP.