These blocks has anyone purchased one lately and if so has anyone used these block and how much extra machining is needed. These block are like the Aluminum World Blocks.and seem to be a better price alternative for a Street hemi with around 750 to 850 HP. Any feed back would be appreciated.

I purchased one last year but I having got around to building it yet. Getting the other parts to put it together have been an issue. I expect to begin putting mine together at the beginning of the new year. You can read the build threads that 440Jim posted this year for a BM 440 aluminum block engine. He put a lot of detail in his build thread that discuss the block and what had to be done to it at the machine shop to get it ready to put together. I would expect the Hemi block to require a similar level of machining. If you haven't purchased one yet and you decide to do so, I can highly recommend Todd Marsh at Marsh racing.

I also have a new BM big bore Aluminum Hemi block on a stand and I'm collecting parts so that I can begin building a 540ci Hemi. I'm expecting to have the sleeves / bores machined to fit the custom pistons, the lifter bores machined to fit the roller lifters, the block decked to spec, and an align-hone on the billet main caps to make sure everything is perfectly straight. Some of the early blocks need some clearancing done in the rear of the lifter galley to clear the link-bar on the roller lifters, but my BM block had this done all ready directly from BM. Something I didn't know about these blocks was they need oil restricting to prevent oil pooling at the top of the heads. This is done by threading in inserts into the topside of the block. There may be other requirements to get these blocks prepped correctly, so I'm all ears if someone wants to chime in with their experience or knowledge.

I ordered a set of Edelbrock Heads in September of 2021 from well known Mopar race shop. They canceled my order 6 months later as Edelbrock couldn't fulfill the order in a timely manner. I ended up re-ordering the heads elsewhere else and I'm expecting the heads to arrive soon. It's unreal to wait over a year for a set of heads. My next step will be purchasing the rotating assembly. I'm leaning towards a custom piston pushing 11:0-11.5:1 static compression.

Some of the things I was wondering about before I call Mitchell for more information. Wanted to know if the Lifter bores were bushed from Mitchell or does this cost more for him to do it. Also what bushing is used in the lifter bores if there is a clearance problem with the Link Bars then maybe a key way bushing might be better for the lifters. Is the push rod era on the block opened up for bigger push rods. I was told the the Edelbrock.Hemi Heads will be ready soon. Also like you I am listening for someones experience with these blocks. I am looking at building a 572, friend with a world block has a 604 built years ago with Stage V street head and a 630 roller shaft and made good HP with it and has had zero problems with it over the years.

Here's a photo of my BMP Block. If you look at the rear valley wall you can see the clearancing for the roller lifter link bar which I understand must face the center of the valley.

One would think Edelbrock heads will eventually show up but I talked to one guy thats had his one order for 2 years. I would suggest having an order in for ARP head studs also. They are also unobtanium. Altho there might be a way around that. Like always, get you parts under your roof so you'll be ready.

I just ordered head studs from Ray Barton for similar build using the Stage V head. Had them in a few days.

Nice. Ray b da man.

I do hope you asked for head studs for a World block and not a 426 Hemi or the inner studs will be too short.

I ordered the ARP inner studs from Summit a couple months ago for the BM hemi block and it only took a few weeks to get them.

I told them what i had, i can only hope they sent the correct studs. What is the part number for the proper stud kit i need?

145-4005 but I never find those. I have to buy the regular 426 Hemi kit 145-4003 and then buy the World inners 245-4312

My BMP build was a wedge block, but most of the info is the same. The head studs and pushrod clearance will be different.

Part 1 - Buying Parts
Part 2 - Part Observations
Part 3 - Machine Shop Report
Part 4 - Mock ups
Part 5 - Build Notes

The blocks come with the bronze bushings installed, including a small 0.030-0.035" oil hole.
The bushings are 1.75" long, and the OD is 1.062"
The ID of the bushings is too small for a Mopar lifter by a little bit. So they need "finishing" as stated in the BMP spec sheet.

Well, dammit. I told them i wanted the 145-4005 and they told me those were something for a chevy. They gave me the 426 studs, 245-4203. I just hate how everything is so f'ed up since covid. You cant hardly get good info from anywhere anymore no matter what your working on. First FBO screwing me around and now Barton selling me the wrong sh!t. I should have called Best for these as they are about the BEST Hemi shop going now. Always get good usable info from that shop. Thanks for the heads up. How many inner bolts in the 245-4312 kit?

Yes Chuck & Pete are my one stop shop !! Gary

245-4306 is the ARP PN# for the inner studs on a KB alum hemi block unless you have your heads drilled & tapped for 1/2" studs

If you said 426 Hemi that's what you got but a World block takes the long inners. 8 studs. I was suspicious when you said you got studs. Nobody wastes as much time as me looking for studs. Get some 245-4312. That's the World inners. There's some on ebay.

I told them I had a BMP block and stage v heads. I will check eBay, thanks

The standard hemi studs (factory) measure about 3.75 and the World Blocks, the Bill Mitchell and the new Callies blocks go 4.25 MINIMUM and 4.500 if you are trying to source them. Just went through this with a Callies block/
Todd

Talked to a raced/speed shop owner that made the call to Mitchells for me. He said the lifter bores on a 4.50 Hemi Block come with sleeved lifters. Only thing is maybe another 6 weeks till you can get a 4.50 bore but a 4.25 is available.Good information on the Bolts will keep that in mind.