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Edelbrock MP heads / older MP how do u tell difference? #509867
10/28/09 01:04 PM
10/28/09 01:04 PM
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North of Detroit
HemiDart68 Offline OP
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How does one tell the difference between the old style and new edelbrock MP aluminum hemi heads. I can tell the difference by looking at them in person but is there a part number difference. Is there anything stamped on the head to indicate different part???


In God we trust, all others pay cash. www.lightnens.com (Home of the world's fastest Paint Job)
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: HemiDart68] #509868
10/28/09 01:27 PM
10/28/09 01:27 PM
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S.E. Michigan
ZIPPY Offline
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Old casting number: 2531110-M
New casting number: 2531110-M2

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: ZIPPY] #509869
10/28/09 01:39 PM
10/28/09 01:39 PM
Joined: Jan 2004
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North of Detroit
HemiDart68 Offline OP
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Zippy, You Sir are the man, thank u


In God we trust, all others pay cash. www.lightnens.com (Home of the world's fastest Paint Job)
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: HemiDart68] #509870
10/28/09 01:51 PM
10/28/09 01:51 PM
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S.E. Michigan
ZIPPY Offline
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You bet, anytime

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: ZIPPY] #509871
11/02/09 01:42 PM
11/02/09 01:42 PM
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Posts: 14
Europe
BB 70 Challenger Offline
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What are the differencies between those two (the old MP Hemi and the new Edelbrock MP Hemi heads) ???

I tried to search but did not find the answer. Please let me know?

Thanks!


Re: Edelbrock MP heads / older MP how do u tell difference? [Re: BB 70 Challenger] #509872
11/02/09 02:30 PM
11/02/09 02:30 PM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
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Quote:

What are the differencies between those two (the old MP Hemi and the new Edelbrock MP Hemi heads) ???

I tried to search but did not find the answer. Please let me know?

Thanks!






From what I've heard, the Edelbrock heads are a much nicer casting and are a little thicker to allow slightly more flow after porting. CHIP


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: Edelbrock MP heads / older MP how do u tell difference? [Re: BB 70 Challenger] #509873
11/02/09 03:38 PM
11/02/09 03:38 PM
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Posts: 3,443
Northern N.J.
hemi_doug Offline
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Quote:

What are the differencies between those two (the old MP Hemi and the new Edelbrock MP Hemi heads) ???

I tried to search but did not find the answer. Please let me know?

Thanks!






The seats fall out of the older castings......

I wouldn't touch one of those heads with a 10 ft pole....



71 440-6 4spd & 69 Hemi 4spd
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: hemi_doug] #509874
11/02/09 03:48 PM
11/02/09 03:48 PM
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Rock Springs
Bob_Coomer Offline
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I have a newer set with the M2 number. There is also the Letter stamped "E" on the head kinda sideways. It looks like the letter used on Edelbrock products..well kinda.
I have a bunch of pics, and with a MCH CNC port program they will break the 460cfm mark...


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: HemiDart68] #509875
11/02/09 05:40 PM
11/02/09 05:40 PM
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Posts: 2,503
Illinois
CRE2004 Offline
super gas
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I have a new set of the M2 heads on the shelf. PM me if you need them
Mike

5582298-31908111.jpg (319 downloads)
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: CRE2004] #2908935
04/11/21 07:14 AM
04/11/21 07:14 AM
Joined: Nov 2020
Posts: 348
Isle of Sheeps
Gtxxjon Offline
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Hi hemi folks,

I have now got an NOS 2531110M and a NOS 2531110-M2 'side by side' and they are very similar except...

A much better exhaust PORT in the Edelbrock M2 head! panic

To let the Flames OUT!!! weld ozbbq

Last edited by Gtxxjon; 04/11/21 07:14 AM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: Gtxxjon] #2908992
04/11/21 10:43 AM
04/11/21 10:43 AM

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Superfreak
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Superfreak
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Wow! Talk about scratching an old thread. I wonder what happened to Bob Coomer? He hasn't been around since 2017.

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: ] #2909197
04/11/21 07:49 PM
04/11/21 07:49 PM
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Yes
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sixpakdodge Offline
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Originally Posted by Superfreak
Wow! Talk about scratching an old thread. I wonder what happened to Bob Coomer? He hasn't been around since 2017.


I always wondered what happened to the '65 Belvedere he was building. He had it just about finished, then dropped off. When he came back on, had a B-1 Duster he was putting together.

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: sixpakdodge] #2909223
04/11/21 08:43 PM
04/11/21 08:43 PM
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fredericksburg,va
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cudaman1969 Offline
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I wanna know more about these seats dropping out, what’s the fix if it’s a real problem?

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: cudaman1969] #2909364
04/12/21 07:40 AM
04/12/21 07:40 AM
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MI, Lapeer
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maximus Offline
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They haven't had loose seats since the early 1990's. They didn't have a tight interferance fit, so some came loose.

Re: Edelbrock MP heads / older MP how do u tell difference? [Re: maximus] #2909796
04/13/21 01:58 PM
04/13/21 01:58 PM
Joined: Nov 2020
Posts: 348
Isle of Sheeps
Gtxxjon Offline
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Isle of Sheeps
Oops I was doing some correspondence with Zippy to get another head and picked this very old thread by error!

The M2 head is a much better casting and has a revised exhaust port.
Most of the newer design hemi heads are “all about the exhaust issues”.
Obviously when the original head and ports were ‘canted over’ for passenger car fitment, it reduced flow... fan

Now the M2 head is ‘way out’ of production, it’s a worry indeed!
Lots of folks need one or two M2’s for their current builds...

Edelbrocks themselves are in a big moving scenario and deny even casting the M2’s... shruggy

But a very nice man did email me to say, they will be available soon?
How did he know this if they don’t actually make them lol? work work work runaway

Last edited by Gtxxjon; 04/13/21 02:07 PM.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...
Re: Edelbrock MP heads / older MP how do u tell difference? [Re: Gtxxjon] #2913774
04/23/21 08:49 AM
04/23/21 08:49 AM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
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My MP heads are from the early/mid 2000s and haven't had any seat issues.

The Edelbrock castings that replaced the MP heads have an "E" cast into them on top of the head. They don't say "Edelbrock" on them, just have the Edelbrock font "E" on them. I have a pair of them in the shop...if anyone wants a pic, I can get you one.
Once Edelbrock came out w/ their own heads, they have the full "Edelbrock" cast onto them. That's a whole different head though.


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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