Mega Block Questions
#2744127
02/17/20 11:52 PM
02/17/20 11:52 PM
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Joined: Aug 2009
Posts: 2,052 Mooresburg, Tn
'72CudaRacer
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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
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Re: Mega Block Questions
[Re: Cab_Burge]
#2744155
02/18/20 06:31 AM
02/18/20 06:31 AM
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Joined: Mar 2006
Posts: 9,871 MI, usa
dvw
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master
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MI, usa
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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
Last edited by dvw; 02/19/20 06:28 AM.
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Re: Mega Block Questions
[Re: dvw]
#2744180
02/18/20 09:32 AM
02/18/20 09:32 AM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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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
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Re: Mega Block Questions
[Re: an8sec70cuda]
#2744250
02/18/20 12:49 PM
02/18/20 12:49 PM
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Joined: Feb 2014
Posts: 1,713 central il.
second 70
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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????
Last edited by second 70; 02/18/20 05:04 PM.
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Re: Mega Block Questions
[Re: Cab_Burge]
#2744441
02/18/20 10:10 PM
02/18/20 10:10 PM
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Joined: Aug 2009
Posts: 2,052 Mooresburg, Tn
'72CudaRacer
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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 I would have the crank magged first to make sure it is not cracked and go from their 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
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Re: Mega Block Questions
[Re: second 70]
#2744444
02/18/20 10:31 PM
02/18/20 10:31 PM
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Joined: Aug 2009
Posts: 2,052 Mooresburg, Tn
'72CudaRacer
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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???? Mine is siamesed and cross bolted. I am curious as to why the chart list the standard bore at 4.19"? Brian
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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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Superfreak
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Re: Mega Block Questions
[Re: '72CudaRacer]
#2744450
02/18/20 11:08 PM
02/18/20 11:08 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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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???? 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
Last edited by MR_P_BODY; 02/18/20 11:24 PM.
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Re: Mega Block Questions
[Re: '72CudaRacer]
#2744568
02/19/20 12:03 PM
02/19/20 12:03 PM
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Joined: Mar 2006
Posts: 1,229 In The Hills
jughed
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pro stock
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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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Joined: Aug 2009
Posts: 2,052 Mooresburg, Tn
'72CudaRacer
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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
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Re: Mega Block Questions
[Re: ]
#2744762
02/19/20 09:33 PM
02/19/20 09:33 PM
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Joined: Aug 2009
Posts: 2,052 Mooresburg, Tn
'72CudaRacer
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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
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Re: Mega Block Questions
[Re: '72CudaRacer]
#2744862
02/20/20 09:35 AM
02/20/20 09:35 AM
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Joined: Mar 2006
Posts: 1,229 In The Hills
jughed
pro stock
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pro stock
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In The Hills
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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.....
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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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Joined: Jan 2003
Posts: 17,907 S.E. Michigan
ZIPPY
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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
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Re: Mega Block Questions
[Re: '72CudaRacer]
#2745043
02/20/20 08:29 PM
02/20/20 08:29 PM
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Joined: Feb 2008
Posts: 715 Central TEXAS!!!!
sr4440
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super stock
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here's a bulldog "B" block that was cast last month.
Without Data, you’re just another guy with an opinion.
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