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  '64 1/2 to '73 -- The Classic Mustang
  2v heads vs. 4v heads?

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Author Topic:   2v heads vs. 4v heads?
1QuikMach
Journeyman

Posts: 5
From:
Registered: Nov 2001

posted 11-06-2001 09:07 PM     Click Here to See the Profile for 1QuikMach   Click Here to Email 1QuikMach     Edit/Delete Message   Reply w/Quote
Are 351M 2v heads interchangable with the Cleveland? If so, is it worth it?

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MLariviere
Moderator

Posts: 3045
From: Biddeford,Me.USA
Registered: May 99

posted 11-06-2001 10:50 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
I had problems with a set of 2V 351M heads last summer. The intake ports didn't quite line up with a 2V Cleveland intake. I ended up going to 4V Cleveland open chambers. Those heads are smogger heads anyway,and will give you a really low C/R,like 8.7 to 1. It's not worth the work IMHO. I do have 2 sets of D5AE's,want them?

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67coupe
Gearhead

Posts: 340
From: dallas NC usa
Registered: Nov 2000

posted 11-07-2001 04:58 AM     Click Here to See the Profile for 67coupe   Click Here to Email 67coupe     Edit/Delete Message   Reply w/Quote
the m heads are basically the same as normal 2 bbl heads except the smog bosses are drilled out, the 2bbl heads have the big combustion chamber like 76cc i think though

------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5

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kid vishus
Gearhead

Posts: 3858
From: middle of NC
Registered: Oct 2000

posted 11-07-2001 06:06 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
They are pretty close to the same head. And no, I wouldnt use them. The exhuast ports on them are even worse than the ports on a regular 2v C head. Since the smog bosses are drilled out, the factory put alot of extra material in the port to strengthen the head. But they put all the extra materail around the guide boss.

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69maverick
Gearhead

Posts: 833
From: Thomaston,CT.
Registered: Jan 2001

posted 11-07-2001 03:22 PM     Click Here to See the Profile for 69maverick   Click Here to Email 69maverick     Edit/Delete Message   Reply w/Quote
I have a question on 302 heads! Is there any gain from the older 4v heads than the 2v's I
noticed that the set of 69 4v's I have laying on the floor under my bench uses larger spark plugs and my have smaller chambers?

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SteveLaRiviere
Administrator

Posts: 30756
From: Saco, Maine
Registered: May 99

posted 11-07-2001 06:32 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 67coupe:
the m heads are basically the same as normal 2 bbl heads except the smog bosses are drilled out, the 2bbl heads have the big combustion chamber like 76cc i think though

I thought that, too, until Mike showed me the difference.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
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My goal is to stop being such a pessimist... but that probably won't happen...

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67coupe
Gearhead

Posts: 340
From: dallas NC usa
Registered: Nov 2000

posted 11-08-2001 12:34 AM     Click Here to See the Profile for 67coupe   Click Here to Email 67coupe     Edit/Delete Message   Reply w/Quote
ur prob right i never really studied the ports on them both but my m heads are ported so guess thats why i didnt notice

------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5

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