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I have been using these for months and months...they are the correct numbers.

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Well, It seems bad news always travels fast! I shipped 3 of these aluminum blocks to Australia earlier this year. Just checked one to find the no name main studs with ARP nuts and cross bolts.It seems to me incomprehensible that World Products are prepared to comprimise the integrity of these blocks and its future reputation to save perhaps $20 or $30 in production costs. Even if the ARP studs were offered as a $50 upgrade on the block purchase I doubt anyone would opt for the no name studs if they were given a choice. I, like others, thought they were fitted with ARP fastners based on the nuts and cross bolts.
AS TO WORLDS REPONSE:
I personaly work in the retail industry here in Australia and to me this could potentialy be a public relations nightmare for the company. In retail we work on the theory that every customer that has a percieved bad experience potentially up to 100 people will here about it directly or indirectly.
From World Products point of view this should be about damage control to there brand. It doesnt matter if their engine builder/representative vouches for the integrity of the studs we are past that now. More than one other competent engine builder has raised legitimate concerns with these studs along with the perception of customers who feel they have been deceived. World Products themselves by changing to ARP fastners in all future blocks only reinforces this perception. We all make mistakes in life knowingly or unknowingly and from a buisness point of view its how you choose to deal with the problem. In the interests of customer relations I feel World Products should offer anyone who purchased a block already and is uncomfortable with the studs a set of ARP free of charge. I hope someone at World Produts reads this post and gives it some consideration.

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I'm in Australia and I have one of those blocks. Will get the replacement studs in any event, and most definitely agree with your comments.

At least some of us found out before the block has gone into use (phew).

It does raise SERIOUS concerns about the integrity of the block overall. Any feedback on this would good... I see someone windowed a World block not long ago on this site ....

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I have been using these for months and months...they are the correct numbers.

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thx for the info again man! block is ready to be put back together... no more chinese studs

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Well, I finally got a new block to replace the one I sawed in half. Now I need the ARP stud kit. Summit and Jegs (UGH) are out almost two weeks. Anybody know where to get them faster. Just for reference the part number is 145-5603.

BTW, not interested in flak from the World Products haters. It's what I'm usin' and that's that!

Also BTW, I've got a good used, low mile World Aluminum block for sale. It's already been pre-lightened and has some good ventilation on each side so it shouldn't overheat.

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Sounds like the item your trying to sell just don't hold water.

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Where did you get that information?

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I saw the new blocks at FHO
Mopar p/n and name machined off the blocks
New studs
Added 1/8 npt plugs in the lifter valley on each side of the oil holes.
Just a few things I

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Gentlemen,

I'd like to introduce myself. My name is Paul Kaufman. I have worked for World Products as a technical representative and engine builder for approximately a decade. I have been building engines professionally for the better part of my life with over 40 years experience in both the private industrial sector and performance speed industry. I have been asked to express my opinion ( and that of World Products ) regarding concerns some of you may have with the main studs utilized on the Mopar iron and aluminum Hemi and Wedge blocks manufactured by World Products. World has manufactured several thousand of both the iron and aluminum blocks in the last few years and recently we have heard that some of these studs have failed when torqued. I have personally assembled many of the Hemi and Wedge engines at World Products, and have not had any issues. I would love to be able to say that there are many torque wrenches that are being used that were manufactured in third world countries and that is the problem, but that would be unfair. World Products does not manufacture studs nor do we import inexpensive hardware from China. The studs used on the Mopar iron blocks are to Mopar's engineering specs and our engineers determined those studs to be of sufficient quality for use on World Products aluminum blocks as well. These studs are not ARP. More recently World Products chose to switch to the ARP brand studs, not because we found them to necessarily be better, but to align ourselves with the hardware being utilized on our Chevy and Ford blocks. I would like to point out that over the years I have experienced failure with hardware manufactured by ARP, but grab another one and move on. I have also experienced a rod breaking or a lifter failing, all from big name brand manufacturers, but that doesn't mean the sets of parts were all defective. The point is sometimes rods break, lifters fail and bolts and studs stretch, break, threads gall, etc. It is the nature of metal objects that have been cast, poured, machined and manipulated that a small percentage will fail, regardless of who manufactured the item. If you find one defective stud that does not mean all the studs are bad. As with most manufacturers, World Products has a warranty policy. Should you find any defect in any of World Products parts or components within one year of purchase simply contact us and we will be more than happy to exchange that defective part. If you would like to change out your hardware to a complete set of ARP studs, you can purchase them from your local ARP dealer or retailer. The caps are located by ring dowels and block registers. The line bore will not be affected. The torque rating on the ARP studs remains the same. Thanks for your time, Paul

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so your saying to go pound sand pretty much!

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sounds like it!