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Mega Block Questions #2744127
02/17/20 11:52 PM
02/17/20 11:52 PM
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Mooresburg, Tn
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'72CudaRacer Offline OP
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Anyone know if there is a way to figure out info on Mega blocks? Things like when was it made, how did it leave mopar (complete crate engine or bare block), orig bore size, ect,ect? Could it be a World Products block? How to tell the difference? How to understand markings on block? What time frame were they produced?
I recently was able to purchase what I believe is a Mopar Mega block that was supposedly a 500 ci crate engine (4.380 bore, 4.150 stroke) w/ stage 6 alum heads, hyd cam and a M1 intake. Although it is still 500 ci, pistons have been changed from cast to forged Wisco, heads long ago changed to Indy SR's (which I didn't purchase, all I got was block & rotating assembly). Block looks good, pistons look good, MP crank is probably going in the scrap pile (damage is repairable, but not much positive going for it) & one of the Eagle rods had a bearing spun.
Any info appriceated. Thanks, Brian

Re: Mega Block Questions [Re: '72CudaRacer] #2744146
02/18/20 02:57 AM
02/18/20 02:57 AM
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Bend,OR USA
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Cab_Burge Offline
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I use those older Mopar 4.15 stroke cranks to make either 4.250 or 4.300 stroke crnakshafts by having them offset ground down to 2.200 rod jourbnal sizes and use BB Chevy type 7.100 long rods up
I would have the crank magged first to make sure it is not cracked and go from their scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Mega Block Questions [Re: Cab_Burge] #2744155
02/18/20 06:31 AM
02/18/20 06:31 AM
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MI, usa
dvw Offline
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This is what the foundry mark looks like in the pre world later Mega block. This one came from Indy with a 4.5 crank. The crank looked like the old Mopar 4.150 cranks had a pentastar stamped in it. Its at least 15 years old. Siamese bore. Been run as a 4.5" bore for over 10 years

Doug

E1.jpg
Last edited by dvw; 02/19/20 06:28 AM.
Re: Mega Block Questions [Re: dvw] #2744180
02/18/20 09:32 AM
02/18/20 09:32 AM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
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IIRC...the World blocks are the only ones w/ freeze plugs and the oil pickup port on the front of the block.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: Mega Block Questions [Re: an8sec70cuda] #2744250
02/18/20 12:49 PM
02/18/20 12:49 PM
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central il.
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second 70 Offline
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The Mopar is cast on the siamese bore block but not on the water mega block.

I wonder if the Chrysler star on the hemi block I posted and it missing on Doug's block where mopar is cast has anything to due to what year the blocks are or maybe it's a hemi wedge thing or someone just removed it from Doug's block????

s-l1600.jpgs-l1600 (2).jpgHemi 1.jpgHemi 2.jpg
Last edited by second 70; 02/18/20 05:04 PM.
Re: Mega Block Questions [Re: second 70] #2744429
02/18/20 09:17 PM
02/18/20 09:17 PM
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Great Neck,LI,new york
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This is a water block I bought in 2000

6.1.17 048.jpg7.10.17 050.jpg7.10.17 042.jpg

HEMI-ITIS has no cure.
My condition is fully BLOWN!!
Re: Mega Block Questions [Re: Cab_Burge] #2744441
02/18/20 10:10 PM
02/18/20 10:10 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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Originally Posted by Cab_Burge
I use those older Mopar 4.15 stroke cranks to make either 4.250 or 4.300 stroke crnakshafts by having them offset ground down to 2.200 rod jourbnal sizes and use BB Chevy type 7.100 long rods up
I would have the crank magged first to make sure it is not cracked and go from their scope


When I say the crank doesn't have much going for it, it really doesn't. In addition to the rear thrust surface being worn down (also been there repaired once), it had #3 rod bearing spun, plus, the crank is already .010" undersized on rods AND mains, the counter weights are approx. .500" larger diameter than most modern cranks and the rod journals are Mopar sized. Other than that, it's a pretty nice piece. By the time that I fixed all that and ship it both ways, I'll be into it for what, $600 (at best) and still have a old multi-time repaired, heavy crank. Not sure that makes sense?

Thanks, Brian

Re: Mega Block Questions [Re: '72CudaRacer] #2744443
02/18/20 10:23 PM
02/18/20 10:23 PM
Joined: Aug 2009
Posts: 2,036
Mooresburg, Tn
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Picture of mine.

20200218_185252.jpg20200218_185234.jpg20200218_185227.jpg
Re: Mega Block Questions [Re: second 70] #2744444
02/18/20 10:31 PM
02/18/20 10:31 PM
Joined: Aug 2009
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Mooresburg, Tn
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Originally Posted by second 70
The Mopar is cast on the siamese bore block but not on the water mega block.

I wonder if the Chrysler star on the hemi block I posted and it missing on Doug's block where mopar is cast has anything to due to what year the blocks are or maybe it's a hemi wedge thing or someone just removed it from Doug's block????


Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"?

Brian

Re: Mega Block Questions [Re: hemi-itis] #2744446
02/18/20 10:50 PM
02/18/20 10:50 PM

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Superfreak
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This is a world hemi block, so not sure if it is the same as an RB block.

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Re: Mega Block Questions [Re: '72CudaRacer] #2744450
02/18/20 11:08 PM
02/18/20 11:08 PM
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Romeo MI
MR_P_BODY Offline
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Originally Posted by '72CudaRacer
Originally Posted by second 70
The Mopar is cast on the siamese bore block but not on the water mega block.

I wonder if the Chrysler star on the hemi block I posted and it missing on Doug's block where mopar is cast has anything to due to what year the blocks are or maybe it's a hemi wedge thing or someone just removed it from Doug's block????


Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"?

Brian


Mopar offered that block in a 4.19 and a 4.50 bore but most of the 4.50 bores were a lousy bore so most had
to be over bored.. thats why most guys got the 4.19... thats what I did also
EDIT
also the numbers you are looking at are just casting numbers..pay no attention to them.. if you look they arent
listed in the parts list above
wave

Last edited by MR_P_BODY; 02/18/20 11:24 PM.
Re: Mega Block Questions [Re: hemi-itis] #2744561
02/19/20 11:49 AM
02/19/20 11:49 AM
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central il.
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second 70 Offline
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The siamese blocks are water blocks but no cooling between the cylinders. The others are full water cooling blocks that's why they called them the water block. Yours is a siamese block.

Re: Mega Block Questions [Re: '72CudaRacer] #2744568
02/19/20 12:03 PM
02/19/20 12:03 PM
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In The Hills
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jughed Offline
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Originally Posted by '72CudaRacer


Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"?

Brian


That flyer came with a shortblock i bought years ago. They used the underlined block to build a 540. It's 4.375 bore / 4.5 stroke (I would have preferred that those specs be reversed, but if it ever gets punched out to a 572 the Callies crank will work with the new combo). I can scan and post the entire flyer if you need it.



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Re: Mega Block Questions [Re: jughed] #2744755
02/19/20 09:25 PM
02/19/20 09:25 PM
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Mooresburg, Tn
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Originally Posted by jughed
Originally Posted by '72CudaRacer


Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"?

Brian


That flyer came with a shortblock i bought years ago. They used the underlined block to build a 540. It's 4.375 bore / 4.5 stroke (I would have preferred that those specs be reversed, but if it ever gets punched out to a 572 the Callies crank will work with the new combo). I can scan and post the entire flyer if you need it.


Yes, I would love to see it. Thanks, Brian

Re: Mega Block Questions [Re: ] #2744762
02/19/20 09:33 PM
02/19/20 09:33 PM
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Mooresburg, Tn
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Originally Posted by Superfreak
This is a world hemi block, so not sure if it is the same as an RB block.

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]


The world hemi block looks like a real nice piece. I do not believe that I have ever seen one or a world wedge block either. How long was this available and how long ago? Any idea how many were made? I did get to repair/rebuild a Koleno block last year (622 ci) and that was a nice part also.If I understand Scott Koffel correctly, only about 100 or so Koleno blocks were actually produced.

Brian

Re: Mega Block Questions [Re: '72CudaRacer] #2744862
02/20/20 09:35 AM
02/20/20 09:35 AM
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jughed Offline
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Originally Posted by '72CudaRacer
Originally Posted by jughed
Originally Posted by '72CudaRacer


Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"?

Brian


That flyer came with a shortblock i bought years ago....... I can scan and post the entire flyer if you need it.


Yes, I would love to see it. Thanks, Brian


Scans.....


mega block 1.jpgmega block 2.jpgmega block 3.jpgmega block 4.jpg


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Re: Mega Block Questions [Re: jughed] #2744863
02/20/20 09:35 AM
02/20/20 09:35 AM
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last scan...... block markings, and the part # label


mega block 5.jpg2016-04-25 17.55.34.jpgIMG_20161129_055908332.jpg


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Re: Mega Block Questions [Re: '72CudaRacer] #2744878
02/20/20 10:50 AM
02/20/20 10:50 AM
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S.E. Michigan
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Originally Posted by '72CudaRacer


The world hemi block looks like a real nice piece. I do not believe that I have ever seen one or a world wedge block either. How long was this available and how long ago? Any idea how many were made?

Brian


The one we call a world block is the one Mopar Performance sold starting in '08 until I believe it was '14 or '15 when they decided to stop managing it.

(That's not to say Megablocks or water MP blocks were shipped in '08 quite a few of the last ones were sold during that time which adds to the confusion.
But '08 was the end of the line for the ones that had a nearly stock appearance).

There are press releases that say Callies has permission to use the tooling those blocks were made from and will be selling the same product soon.
Not sure how accurate their eta is.

As far as how many were sold I would need the decoder and access to Rumba (Chrysler reynolds and reynolds green screens) to
look up the historic sales volumes and add them up, or somebody at Mopar IC or similar function could probably do it if they were interested in finding it.
There is a spread of multiple part numbers, so it would probably take some time to put the data together but it's possible to find that. Someone on the inside could do it.


Rich H.

Esse Quam Videri




Re: Mega Block Questions [Re: ZIPPY] #2745032
02/20/20 07:47 PM
02/20/20 07:47 PM
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Mooresburg, Tn
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Thanks for the scans and info. I enjoy all the info that I can get on this stuff!
Thanks, Brian

Re: Mega Block Questions [Re: '72CudaRacer] #2745043
02/20/20 08:29 PM
02/20/20 08:29 PM
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Central TEXAS!!!!
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here's a bulldog "B" block that was cast last month.

IMG_20200220_181022720.jpgIMG_20200220_181033133.jpgIMG_20200220_181054208.jpgIMG_20200220_181102040.jpg

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