Bill Mitchell Hemi Block
#3099115
12/03/22 12:01 AM
12/03/22 12:01 AM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
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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.
Last edited by hemicar1971; 12/03/22 11:03 AM.
1971 HEMI E BODY REGISTRY
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Re: Bill Mitchell Hemi Block
[Re: blowndart]
#3099332
12/03/22 09:39 PM
12/03/22 09:39 PM
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Joined: Jul 2005
Posts: 712 California
BigDaddy440
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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.
Last edited by BigDaddy440; 12/03/22 09:44 PM.
1969 A12 Roadrunner 1970 Plymouth Cuda 1968 Dodge Dart
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Re: Bill Mitchell Hemi Block
[Re: BigDaddy440]
#3099375
12/04/22 01:00 AM
12/04/22 01:00 AM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
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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.
1971 HEMI E BODY REGISTRY
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Re: Bill Mitchell Hemi Block
[Re: BigDaddy440]
#3099415
12/04/22 10:17 AM
12/04/22 10:17 AM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
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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.
2011 Drag Pak Challenger
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Re: Bill Mitchell Hemi Block
[Re: mopar dave]
#3099545
12/04/22 04:15 PM
12/04/22 04:15 PM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
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I just ordered head studs from Ray Barton for similar build using the Stage V head. Had them in a few days. 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.
2011 Drag Pak Challenger
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Re: Bill Mitchell Hemi Block
[Re: rickseeman]
#3099591
12/04/22 07:21 PM
12/04/22 07:21 PM
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Joined: Jan 2003
Posts: 965 Odessa, Fl
blowndart
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I just ordered head studs from Ray Barton for similar build using the Stage V head. Had them in a few days. 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.
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Re: Bill Mitchell Hemi Block
[Re: mopar dave]
#3099600
12/04/22 07:54 PM
12/04/22 07:54 PM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
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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
2011 Drag Pak Challenger
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Re: Bill Mitchell Hemi Block
[Re: rickseeman]
#3099662
12/04/22 11:16 PM
12/04/22 11:16 PM
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Joined: Jan 2007
Posts: 8,043 Mt Morris Michigan
mopar dave
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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?
Last edited by mopar dave; 12/04/22 11:51 PM.
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Re: Bill Mitchell Hemi Block
[Re: Gabby63]
#3099786
12/05/22 12:39 PM
12/05/22 12:39 PM
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RATTRAP
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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
Last edited by RATTRAP; 12/05/22 12:41 PM.
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Re: Bill Mitchell Hemi Block
[Re: RATTRAP]
#3099793
12/05/22 12:50 PM
12/05/22 12:50 PM
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Joined: Jan 2012
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rickseeman
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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.
2011 Drag Pak Challenger
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Re: Bill Mitchell Hemi Block
[Re: sasquatch]
#3100278
12/06/22 11:55 PM
12/06/22 11:55 PM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
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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.
1971 HEMI E BODY REGISTRY
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