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For the Hemi Guru's #2372259
09/17/17 03:56 PM
09/17/17 03:56 PM
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New Jersey
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Dartforforty Offline OP
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This is the number on the side of my hemi block.
I am trying to determine how old it is and who manufactured it.

Thanks
Ed


Re: For the Hemi Guru's [Re: Dartforforty] #2372266
09/17/17 04:33 PM
09/17/17 04:33 PM
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Abilene, Texas
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fastmark Offline
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It should have a date on it cast in. That is a later Mopar performance block or pre world.

Re: For the Hemi Guru's [Re: Dartforforty] #2372356
09/17/17 08:05 PM
09/17/17 08:05 PM
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Bend,OR USA
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Cab_Burge Online work
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Mopar "Mega " block maybe shruggy
Not OEM shruggy

Last edited by Cab_Burge; 09/17/17 08:05 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: For the Hemi Guru's [Re: Dartforforty] #2372688
09/18/17 01:18 PM
09/18/17 01:18 PM
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Wheatfield, NY
Cuda340 Offline
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Here is the info on the block.

Hemi 1.jpgHemi 2.jpg
Last edited by Cuda340; 09/18/17 01:18 PM.
Re: For the Hemi Guru's [Re: fastmark] #2372697
09/18/17 01:31 PM
09/18/17 01:31 PM
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Jefferson State
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srt Offline
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Jefferson State
Originally Posted By fastmark
It should have a date on it cast in. That is a later Mopar performance block or pre world.

I agree with this, but to clarify Mopar Performance block, and NOT a later (newer) World block.
It's a good replacement block for a restoration as it looks more like an original.

Re: For the Hemi Guru's [Re: srt] #2372758
09/18/17 03:16 PM
09/18/17 03:16 PM
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dogdays Offline
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When these were introduced by Chrysler it was in all the Mopar magazines. The story went, that as Chrysler stopped production of bigblocks in 1978 all the bigblock stuff was scrapped. So when they decided to make a new Hemi block they had to start from scratch. This was the result. The "M" after the casting number was to keep them from being passed off as original blocks.

I am guessing that these were the blocks that MP also used for the new crate Hemis in the Cummins era, but I've no proof.

I do know that there was much rejoicing in the MOPAR world when this announcement came out. Plus the availability of Siamese blocks opened up a whole new range of displacements available.

R.

Last edited by dogdays; 09/18/17 03:17 PM.
Re: For the Hemi Guru's [Re: Dartforforty] #2372769
09/18/17 03:34 PM
09/18/17 03:34 PM
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New Jersey
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Dartforforty Offline OP
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Yes it is a Siamese Mega block. 4.50 on the bore.
Next time I am at my shop I will look for a cast date, just not sure how to read it.
Glad it is a pre World block

Thanks
Ed




Last edited by Dartforforty; 09/19/17 03:57 PM.
Re: For the Hemi Guru's [Re: Dartforforty] #2372817
09/18/17 04:38 PM
09/18/17 04:38 PM
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Motor City
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6PKRTSE Offline
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Yes, it is a Mopar Mega block. Started life as a 4.500" pre World block. I have the same block.


1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
Re: For the Hemi Guru's [Re: Dartforforty] #2373091
09/19/17 01:26 AM
09/19/17 01:26 AM
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Jefferson State
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Jefferson State
iirc the mopar logo and mopar spelled out designated HP mega block.
were the non-siamese blocks cast with the M and mopar?
I'm under the impression the siamese blocks came rough bored at 4.19"

Re: For the Hemi Guru's [Re: srt] #2373288
09/19/17 01:34 PM
09/19/17 01:34 PM
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central il.
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Originally Posted By srt
iirc the mopar logo and mopar spelled out designated HP mega block.
were the non-siamese blocks cast with the M and mopar?
I'm under the impression the siamese blocks came rough bored at 4.19"


The non siamese blocks had the M cast into them but not the word Mopar.

Re: For the Hemi Guru's [Re: Dartforforty] #2373451
09/19/17 06:14 PM
09/19/17 06:14 PM
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Jefferson State
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srt Offline
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great, thank you!

Re: For the Hemi Guru's [Re: srt] #2373852
09/20/17 12:17 PM
09/20/17 12:17 PM
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Wheatfield, NY
Cuda340 Offline
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Originally Posted By srt
great, thank you!


Read my two attachments: tells all.







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