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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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Joined: Jul 2003
Posts: 712 New Jersey
Dartforforty
OP
super stock
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OP
super stock
Joined: Jul 2003
Posts: 712
New Jersey
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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
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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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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Mopar "Mega " block maybe Not OEM
Last edited by Cab_Burge; 09/17/17 08:05 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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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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Joined: Jan 2003
Posts: 15,724 Jefferson State
srt
ESYC
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ESYC
Joined: Jan 2003
Posts: 15,724
Jefferson State
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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.
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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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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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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.
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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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Joined: Jul 2003
Posts: 712 New Jersey
Dartforforty
OP
super stock
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OP
super stock
Joined: Jul 2003
Posts: 712
New Jersey
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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.
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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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Joined: Jan 2004
Posts: 4,564 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,564
Motor City
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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.
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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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Joined: Feb 2014
Posts: 1,699 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,699
central il.
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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.
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