351m 4brl 4-v
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351m 4brl 4-v
I have a f100 with a 351m in it.(who hasn't, right?) According to my official ford handbook it has 4-V heads and 9.1:1 compression. This is an Australian delivered vehical too. In all my research I have not seen this combination on a U.S. truck.
So what is a 4-V compared to the 2-V? and why is it on top of my motor? Is this helping to keep my compression higher?
So what is a 4-V compared to the 2-V? and why is it on top of my motor? Is this helping to keep my compression higher?
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Why anyone, even a Ford Australia, would want to put 4V heads on a 351M is a mystery. That would be about as useless as **** on the proverbial boar hog, or for you down under, **** on a croc. Are you sure it is not a 351C? 4V heads were not available on any of the 351M/400 vehicles made in the USA.
4V heads have huge ports that are really only suitable for high RPM racing applications.
4V heads have huge ports that are really only suitable for high RPM racing applications.
Last edited by Torque1st; Sep 17, 2005 at 07:25 AM.
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From: Delaware
If it has true 4V heads it could be the 72-73 open chamber heads with 75.4cc combustion chamber.
Are you sure that it is a 351M and not a 351C. The 4v intake manifold would indeed be a rare item to fit a 351M block.
True 4V heads have larger ports and valves than 2V heads. The compression is a little higher than US 351M motors because the US 2V heads have 78.4cc chambers. You would also need a smaller dish in the piston to increase the CR.
Another possibility is 62.8cc closed chamber 4V heads with a standard 351 piston.
Again the 4V intake manifold to fit a 351M is very rare.
Are you sure that it is a 351M and not a 351C. The 4v intake manifold would indeed be a rare item to fit a 351M block.
True 4V heads have larger ports and valves than 2V heads. The compression is a little higher than US 351M motors because the US 2V heads have 78.4cc chambers. You would also need a smaller dish in the piston to increase the CR.
Another possibility is 62.8cc closed chamber 4V heads with a standard 351 piston.
Again the 4V intake manifold to fit a 351M is very rare.
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From: chicago burbs
being in Australia it should be easy for you to find an expert on the Cleveland engine, can you get a confirmation that you absolutely do not have a Cleveland? the M engine can be easily idenitied by the height of the thermostat compared to the top of the timing cover. the Cleveland thermostsat is at the same height as the top of the timing cover section of the block. the M engine has the thermostat raised significantly from the level of the top of the timing cover section of the block, at least an inch(2.54cm) or so. most but not all M engines also have a rib of metal standing up to the right of the dizzy, about the same height as the thermostat level. there has NEVER been, not factory or aftermarket, a 4V 351M/400 intake manifold made! there are rumors of a California Police 400/4V but no one has been able to prove that a single one was ever produced. Australian intakes for the 302C/351C have the 2V port sizes internally and a 4bbl carb mounting pad, both spreadbore and squarebore. just because an Aussie intake has a 4bbl carb pad does not make it a 4V intake. what year is your truck?
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It is an 1981 delivered f100 first registered in 1982. I am just quoting my owners manual when I call it a 4V. I would not know the difference. The thermostat is bolted on to the block just below the timing cover but by the time you get to the top of it, it is well over a inch tall. The sensors in it are almost a high a the dizzy. Also the dipstick goes into the middle of the left side of the oil pan. I have only ever seen clevelands with the dipstick going into the side of the timing cover.(or right next to it)
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I've never heard of an Australian built vehicle that came with a 351M/400. A very few small port, Aussie made heads were referred to as 4V heads. It should have a 4V intake as well. They supposedly had large 4V valves with something like a 67cc chamber. My best guess is they were used when the US 4V heads were no longer available.
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4v heads
Although I have never seen any of these on the 351m, I have a book that says they were available in Ford LTD'S. I am always looking at the yards.
I would say the key here would be F100, I would guess something like 351w, I don't think I've ever seen F100 with 351m? Not sayin they ain't available?
I would say the key here would be F100, I would guess something like 351w, I don't think I've ever seen F100 with 351m? Not sayin they ain't available?
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From: chicago burbs
i just found a good pic of the front of a bare 351M/400 block. note the raised thermostat area and the rib across from it. cut and paste this item number into an Ebay search, my link didn't work, as usual. it's item # 8000868890
can you see the casting numbers down by the starter on your block? what are they?
can you see the casting numbers down by the starter on your block? what are they?
Last edited by grclark351; Sep 18, 2005 at 12:22 PM.
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From: Sin City, USA
Originally Posted by aussiesb1
It is an 1981 delivered f100 first registered in 1982. I am just quoting my owners manual when I call it a 4V. I would not know the difference. The thermostat is bolted on to the block just below the timing cover but by the time you get to the top of it, it is well over a inch tall. The sensors in it are almost a high a the dizzy. Also the dipstick goes into the middle of the left side of the oil pan. I have only ever seen clevelands with the dipstick going into the side of the timing cover.(or right next to it)
Last edited by 73XAFalcon; Sep 18, 2005 at 12:29 PM.
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My VIN looks nothing like any US VINs I have seen. ALIJYP 80126K My engine code is C and Transmission is R. The model number is 62132. Is the aussie 351c compatable with the US 351c for things like pistons, high vol oil pumps, big stroker kits?
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From: Sin City, USA
Originally Posted by aussiesb1
My VIN looks nothing like any US VINs I have seen. ALIJYP 80126K My engine code is C and Transmission is R. The model number is 62132. Is the aussie 351c compatable with the US 351c for things like pistons, high vol oil pumps, big stroker kits?
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From: chicago burbs
on the dizzy, isn't just that the Aussie block has a smaller diameter hole where the end of the dizzy shaft fits? and a US spec dizzy shaft can be turned down if the engine is to stay assembled, or the hole can be opened up if the engine is already apart? i guess this was done to keep the point dizzies out of the later model engines? for emissions reasons?
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