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How big can you go with a RB Big Block? #1137453
12/16/11 11:35 PM
12/16/11 11:35 PM
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XXHEMI Offline OP
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Trying to find out max cubic inches from a big block if money was no object? Not thinking about practicality just a max cube.

Thanks Ed

Re: How big can you go with a RB Big Block? [Re: XXHEMI] #1137454
12/16/11 11:40 PM
12/16/11 11:40 PM
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dannysbee Offline
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Stock block or aftermarket? External or internal oil pick-up? I am shooting for 523 stock block 1/2" internal pick-up.


Getting old just means you were smarter than some and luckier than others.
Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137455
12/16/11 11:43 PM
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XXHEMI Offline OP
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Sorry Stock block. Stock appearing oiling system

Re: How big can you go with a RB Big Block? [Re: XXHEMI] #1137456
12/16/11 11:55 PM
12/16/11 11:55 PM
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dannysbee Offline
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With a sleeved block and honda rod journals on the crank I think 572 is possible Ed.


Getting old just means you were smarter than some and luckier than others.
Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137457
12/17/11 12:01 AM
12/17/11 12:01 AM
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long island NY
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Ari440 Offline
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rb 4.375 bore and 4.50 stroke 541ci

the oilpickup will need some work to fit or make your own


1.39 9.85 - 137 mph
Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137458
12/17/11 12:02 AM
12/17/11 12:02 AM

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I just finished an RB 493 and had to use an external oil pickup. I don't think more than 540 on a stock block.

Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137459
12/17/11 12:07 AM
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XXHEMI Offline OP
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Danny
Do you now anyone that did this? And could it ne reliable?

Not really looking to do it myself just trying to figure out what the max would be???

Re: How big can you go with a RB Big Block? [Re: ] #1137460
12/17/11 12:11 AM
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XXHEMI Offline OP
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I already have 540 with very little mods and it has been very reliable to date.

Just wondering if anyone has gone bigger?

6970500-bigedpalooza3.jpg (101 downloads)
Re: How big can you go with a RB Big Block? [Re: ] #1137461
12/17/11 12:24 AM
12/17/11 12:24 AM
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dannysbee Offline
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You would have to move the oil pick-up diagonally up and to the outside as far as possible. That combined with the honda rod journels I believe will get you a 4.5 stroke. These people should be able to provide the block. http://www.speedomotive.com/ps-615-74-speed-o-motive-uber-block-assembled-custom-short-block.aspx Presto chango 572 4.5 x 4.5 Thats if I am spending your money. On my dime 523.


Getting old just means you were smarter than some and luckier than others.
Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137462
12/17/11 12:39 AM
12/17/11 12:39 AM
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dannysbee Offline
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Ed the SS/AH cars use the honda journal so no problem there. The LS1 boys used that type of sleeveing on the stock LS1 block before big bore aftermarket blocks were available. It is a reliable but expensive process. Run it buy Mr. Porter an see what he says. I think it is possible and so does my engine builder.


Getting old just means you were smarter than some and luckier than others.
Re: How big can you go with a RB Big Block? [Re: XXHEMI] #1137463
12/17/11 12:55 AM
12/17/11 12:55 AM
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rickraw Offline
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why bother with a stock block with that much cubs. most of the members here been there done that. go with an after market block. do it rite the first time. u'll save $$$ in the long run. seeya.

Re: How big can you go with a RB Big Block? [Re: rickraw] #1137464
12/17/11 01:03 AM
12/17/11 01:03 AM
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dannysbee Offline
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Sometimes class rules dictate what you get to use. In F.A.S.T racing the stock block is the only game in town.


Getting old just means you were smarter than some and luckier than others.
Re: How big can you go with a RB Big Block? [Re: XXHEMI] #1137465
12/17/11 01:21 AM
12/17/11 01:21 AM
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HPMike Offline
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Here is my take...

540 is no problem, as you know-providing you have a "good" block..

I have sonic'ed a lot of Mopar wedge blocks. Never seen one that could possibly be bored 180 over to reach 4.5. Most are pretty scary after 4.375(55 over-the good ones). Although I have a freak block at the shop that might be able to go .090" or .100"?. While I have never actually done it, a 4-5/8" stroke with a .070" might be doable. It would have to be tall filled and even then it might be a time bomb. And I don't know how much more stroke you can get with the [Edited by Moparts - Family Friendly Site - Keep it clean] journal sizes and maintain the internal pickup. Of course you can move the pickup point a bit, but you do eventually reach a point of diminishing returns.

That being said, lets say 560" is about all you can hope for. And there are NO production wedge heads that will use it to its advantage, unlike Hemi's, canted valve big Fords, or BB Chevs..

MB

Re: How big can you go with a RB Big Block? [Re: dannysbee] #1137466
12/17/11 01:22 AM
12/17/11 01:22 AM
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Quote:

Sometimes class rules dictate what you get to use. In F.A.S.T racing the stock block is the only game in town.




Not for long, Danny...Stay tuned...

MB

Re: How big can you go with a RB Big Block? [Re: HPMike] #1137467
12/17/11 08:15 AM
12/17/11 08:15 AM
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Chris'sBarracuda Offline
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I believe that Bird, Muscle Motors and Koffel have done 540" low decks in 400 blocks..

Check with them..

4.390 bore x 4.500 stroke..



Chris..

Re: How big can you go with a RB Big Block? [Re: rickraw] #1137468
12/17/11 08:31 AM
12/17/11 08:31 AM
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XXHEMI Offline OP
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Quote:

why bother with a stock block with that much cubs. most of the members here been there done that. go with an after market block. do it rite the first time. u'll save $$$ in the long run. seeya.




Rick.

As stated not going to actually do this just looking to find out if anyone has built anything bigger then a 560.

My car was built for FAST and as the rule reads you must
use a stock block.

HP Mike built the Motor two years ago as a 540. 100% FAST legal and has been very reliable with over 100 passes on it. Best time to date 10.38 @ 133 on a six inch bias ply tire.

Re: How big can you go with a RB Big Block? [Re: HPMike] #1137469
12/17/11 09:32 AM
12/17/11 09:32 AM
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Quote:

Quote:

Sometimes class rules dictate what you get to use. In F.A.S.T racing the stock block is the only game in town.




Not for long, Danny...Stay tuned...

MB




I am sorry Mike I should have said run it by you. I am getting old it sux. Mike sticking to Ed's perimeters on his post you don't think the Darton sleeved block is a viable option? Speedomotive is offering 4.22 bore 360 mopar blocks using that process.

Should I order my KB block with a raised cam so I can put a 5" arm in it?


Getting old just means you were smarter than some and luckier than others.






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