351C 2V Closed Chamber?
Junior User
Joined: Feb 2011
Posts: 70
Likes: 0
From: Esperance Western Austral
I would only go up to 4000 and only in short sprints clean the cobwebs out. won't be any load
I think ya right though about the load this is only ever gunna be a sunday driver and the odd cruise with the local car club. But I would like to build it right
The motor in the ol girl now has to have a kick up the pants every now and again. Once you clean the cob webs out its a totaly different ute. I don't think you can avoid that. I would be drivin one of these modern motors otherwise.
I just love the sound of the old clevelands and windsors can hear them comin from miles away.
I think ya right though about the load this is only ever gunna be a sunday driver and the odd cruise with the local car club. But I would like to build it right
The motor in the ol girl now has to have a kick up the pants every now and again. Once you clean the cob webs out its a totaly different ute. I don't think you can avoid that. I would be drivin one of these modern motors otherwise.
I just love the sound of the old clevelands and windsors can hear them comin from miles away.
Senior User
Joined: Mar 2003
Posts: 259
Likes: 2
From: SOUTHERN NEW JERSEY
I run the 351C-4V in a 82 ford f100, no power under 4000 rpm. Only because of the cam I have..... I am running the 4V CC heads with flat top pistons, I want to take full advantage of the power these heads create in the upper rpm range. From 4000 to 7400 rpm its a real kick in the ***. Big gear (4.56) and a 4500 stall convertor she comes out hard and hits like a rhino.
Your right, nothing sounds like a well built 351C, THATS A FACT!
Matty
Your right, nothing sounds like a well built 351C, THATS A FACT!
Matty
Junior User
Joined: Feb 2011
Posts: 70
Likes: 0
From: Esperance Western Austral
G'Day neva
seem to be runnin 2 threads here got the wires crossed me old mate Mark.a had me in a spin there for a while I thought he was stalkin me
Anyhow Iam over it. I am a bit new to this chatting forum thing its the first time I have done anything like this. My wife thinks I am havin an affair she snuck on once the other day and got a shock it was really about secret mens business
I am finding it a bit addictive but it great to chat to like minded people and dumb ***** like me might learn something.
I really need to find out about these heads though cause I have the choice of 4v closed or 2v open with ported exhaust I wont say 4v exhaust again it confuses every one but they have the 4v exhaust ports. I need to know as much info as I can gleen cause that will determine what cam to use, carby, head gaskets, lifters, what color undies to ware, should I have my tounge hangin out my fingers crossed all while I am doin a handstand.
seem to be runnin 2 threads here got the wires crossed me old mate Mark.a had me in a spin there for a while I thought he was stalkin me
Anyhow Iam over it. I am a bit new to this chatting forum thing its the first time I have done anything like this. My wife thinks I am havin an affair she snuck on once the other day and got a shock it was really about secret mens business
I am finding it a bit addictive but it great to chat to like minded people and dumb ***** like me might learn something.
I really need to find out about these heads though cause I have the choice of 4v closed or 2v open with ported exhaust I wont say 4v exhaust again it confuses every one but they have the 4v exhaust ports. I need to know as much info as I can gleen cause that will determine what cam to use, carby, head gaskets, lifters, what color undies to ware, should I have my tounge hangin out my fingers crossed all while I am doin a handstand.
Elder User
Joined: Jan 2011
Posts: 831
Likes: 1
From: Tanilba bay NSW Australia
yeah, I've seen you on a couple eh, bit of a mind screw. My heads are 2V with 4V valves and are good at least up to 5k but not as good down low but as we've discussed there are some limiting factors on my build. there seems to be ample flow through the ports and there are a heap of suppliers doing port stuffers out there to improve velocity with 4V heads. IMHO I would stick with 2V and get good advice on unshrouding around the valve and improving the flow path if the things for street and is naturally aspirated. And like it's been mentioned (neversosure?) by myself and others that RPM air gap seems to be the ticket. It was even suggested to me by a reputable manifold manufacturer here in OZ, and it's not even his manifold.
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Ok I just read this thread and I'm confused. I just bought some closed chamber 2v heads. So these are really Aussie 302C heads??? Will they work on the regular American 351C? I see that the CC is like 58?!? What kinda compression is that gonna give me with flat top pistons???
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. To figure compression ratio, you need to consider head combustion chamber cc's, valve relief/dish/dome of pistons cc's, any champfer on edge of pistons cc's, cc's of hole in head gasket, cc's above piston to top deck of block, and cubic inches of engine... plug all that into this formula (its easier than it sounds):
http://www.summitracing.com/popup/ca...ion-calculator
. Lack of torque under 4000 RPMs is usually from too big a cam for street use... but can also be from opening all 4 bbl. of a carburetor at too low an RPM, distributor ignition advance not working properly, too low fuel level in carb., blown power valve in carb., carb. jetted too rich or lean, ports in intake manifold and head too large/too short... short tube headers to a lesser extent...
. Consider that the stock valves in a 351M or Ford 400 2V head are actually LARGER than the vaunted 'fuely valves' that the SBC/small block Chevy guys use to make 500+ HP...!
. Pinging in 351M/400's is often mainly from the pistons being way too far down in the hole when at TDC... and the standard 'rebuilder' pistons are even WORSE, even further down... this gives horrible engine 'quench' effects...
https://www.google.com/#q=engine+quench
http://www.summitracing.com/popup/ca...ion-calculator
. Lack of torque under 4000 RPMs is usually from too big a cam for street use... but can also be from opening all 4 bbl. of a carburetor at too low an RPM, distributor ignition advance not working properly, too low fuel level in carb., blown power valve in carb., carb. jetted too rich or lean, ports in intake manifold and head too large/too short... short tube headers to a lesser extent...
. Consider that the stock valves in a 351M or Ford 400 2V head are actually LARGER than the vaunted 'fuely valves' that the SBC/small block Chevy guys use to make 500+ HP...!
. Pinging in 351M/400's is often mainly from the pistons being way too far down in the hole when at TDC... and the standard 'rebuilder' pistons are even WORSE, even further down... this gives horrible engine 'quench' effects...
https://www.google.com/#q=engine+quench
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
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Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. "regular" gas... or 'pump' gas? ... Maybe pump 94 octane would work. Might need an ounce or two of kerosene per tankful to keep the pinging at bay. Maybe more kerosene would even make 'regular' 87 octane work... Aluminum heads would lower the pinging threshold even more...
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
I meant regular 87-91 octane. Even though compression would go up, so would the quench. So I think it would be ok. I'm running about 9.5:1 right now. With open heads and 16* timing advance and 87 octane I just start to get pinging.
Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
Ok I just read this thread and I'm confused. I just bought some closed chamber 2v heads. So these are really Aussie 302C heads??? Will they work on the regular American 351C? I see that the CC is like 58?!? What kinda compression is that gonna give me with flat top pistons???
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
Originally Posted by nothercrash;10048093.
I always thought though, that there was another kind, 351C heads, that were 2V sized, with closed chambers, and with the SAME SIZE COMBUSTION CHAMBERS as the 4V closed chamber heads.
Does anybody know if there are 2V closed chamber heads other than the smaller chambered 302C heads? I was always under the impression that there were.....
Does anybody know if there are 2V closed chamber heads other than the smaller chambered 302C heads? I was always under the impression that there were.....
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. 9.67:1 sounds low, must have dished pistons?
. Someone above mentioned having to 'clean the cobwebs out' to get their engine to run properly... sounds like it may be jetted too rich... or choke not coming off fast enough... power valve blown out...
. Someone above mentioned having to 'clean the cobwebs out' to get their engine to run properly... sounds like it may be jetted too rich... or choke not coming off fast enough... power valve blown out...
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