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Author
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Topic: 2v heads?
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timjk
Journeyman Posts: 57
From:
Registered: Oct 2001
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posted 02-12-2003 12:00 AM
   
I decided to use 2v heads for my 351C street machine. Are all the heads for the later 351M/400's all the same? Did some of them use actual hard seats? Any help appreciated.Tim
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 02-12-2003 07:45 AM
I used to think they were, but I found out they weren't when we traced a vacuum leak on my brother's Torino to the intake ports on my brother's D5 heads being about .500" lower than his intake ports, causing a bad mismatch. People have said I'm wrong, but I saw what I saw.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 02-12-2003 07:50 AM
I don't know about the seats, but the exhuast ports in the 351M/400 heads are really REALLY terrible. They are worse than a standard 2v cleveland head which isn't the best thing in the world in the first place.
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 02-12-2003 08:50 AM
I wouldn't worry about hardend seats.
I don't know of anyone that had any real problems with unleaded gas with a cleveland.
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timjk
Journeyman Posts: 57
From:
Registered: Oct 2001
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posted 02-12-2003 01:29 PM
Hmmmmm...
Maybe I should just grab a pair of cleveland heads then. I understand the cleveland seats are induction hardened. Of course the machine shops always wanna sell me a set of new seats.
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 02-12-2003 01:42 PM
quote:
Originally posted by timjk:
Hmmmmm...
Maybe I should just grab a pair of cleveland heads then. I understand the cleveland seats are induction hardened. Of course the machine shops always wanna sell me a set of new seats.
Beware that most seats shops install are plain old cast iron.
Now Stellite seats are really hard, expensive and hard to machine.....
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 02-12-2003 11:45 PM
quote:
Originally posted by kid vishus:
I don't know about the seats, but the exhuast ports in the 351M/400 heads are really REALLY terrible. They are worse than a standard 2v cleveland head which isn't the best thing in the world in the first place.
LOL!! Those Big 4V Cleveland heads of yours must have you really spoiled. When is the last time you saw a stock Windsor exhaust port? You can put 2 of them even in a 2V Cleveland. 
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1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 02-13-2003 07:38 AM
Thye do have me spoiled, but after grinding on that stupid air injection bump around the valve guide for hours in a set of "M" heads, I know they are really terrible compared to a regular set of 2v cleveland heads.
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64FalconF-16
Gearhead Posts: 196
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002
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posted 02-13-2003 08:51 AM
In a word.....AUSSIES
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 02-13-2003 09:03 AM
quote:
Originally posted by 64FalconF-16:
In a word.....AUSSIES
But those also requir alot of grinding to make flow halfway decent. Those small chambers which are good fro compression are terrible for flow. They shroud the valves badly. If you don't mind grinding on them in the chamber area to unshroud the valves, they work good for a mild motor.
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timjk
Journeyman Posts: 57
From:
Registered: Oct 2001
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posted 02-13-2003 01:59 PM
quote:
Originally posted by kid vishus:
Thye do have me spoiled, but after grinding on that stupid air injection bump around the valve guide for hours in a set of "M" heads, I know they are really terrible compared to a regular set of 2v cleveland heads.
My '72 4v heads also have that big bump in the exhaust port roof.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 02-13-2003 03:11 PM
quote:
Originally posted by timjk:
My '72 4v heads also have that big bump in the exhaust port roof.
Not like the "M" heads have. The entire guide boss is encased in it. It is about as tall as the guide, sticks out just as far, and looks like a solid mass clear back into the bowl. Looking down into the bowl for the valve side, it looks like a big step in the port with the guide boss in the center of it. It's a lot worse than that little bump in the roof of the port that all the cleveland heads came with.
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