351 Clevveland M-Code
11-09-2006, 07:49 PM
#4
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RE: 351 Clevveland M-Code
Yeah, it's a Cleveland. The M-code version was produced from 1970 through 1971. It used a high 10.7:1 compression ratio with "4V" quad-barrel carburetors and the quench head-design 4V heads. Hydraulic lifters were also specified, with the M-code producing about 300 hp (224 kW). 2-bolt main caps were used along with a cheaper cast iron intake manifold. So, if you changed to an aluminum intake that breathes better, you might even get about 350 HP from that engine. Streetable? What do you mean by that? You can drive it on the street. 
11-09-2006, 07:49 PM
#5
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RE: 351 Clevveland M-Code
Well if its a Cleveland they are streetable, they can use a bit more cam and a mild stall real well, but even in stock form they run good. My 4Vs ran better than my 289s and 302s, idled good and everything. dont know why someone would say they arent streetable, unless they have a huge cam that doesnt make any power under 4000 rpm.
11-10-2006, 02:04 PM
#7
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RE: 351 Clevveland M-Code
Well the 4V makes more tope end power than the 2V. The ports are freaky huge in the 4V thats the big difference. If you cam it right the 4V makes great power and still has good driveability even with the stock intake and carb. The 2V needs a 4 barrel intake and carb to make any decent power, but when you apply the right cam, intake, tuning, an headers they are an animal on the streeet.
The best way to make a 4V unbearable to drive is add a single plane intake, an 850 mechanical carb, and a cam with 244 and up duration at .050 lift. It will be a dog on the bottom, and will need steep gears like 4.11-5.13s just to move. Sure it will run hard after 4000 rpm, but it would suck to drive around in.
add the same to a 2V and you will have a pig that doesnt run with the 4V anyway. Clevelands have the biggest ports of any small block, that means even the 2V can make a stupid amount of power if built correctly. In stock form they are mild and tractable just like anyother OEM engine from the 70s. It doest take much to wake them up.
If you have a 4V just build it, its fine for a street car. If you have a 2V dont worry about gettin the 4V heads for it.. unless you find them cheap and in good shape. The 2V is a great engine as is the 4V. The difference is the heads and where they make the most power.
Soe people actually make the 4V ports smaller, they eliminate dead space at the bottom of the ports, that speeds up flow. It isnt really needed on a street vehicle unless its a max effort street strip car.
The best way to make a 4V unbearable to drive is add a single plane intake, an 850 mechanical carb, and a cam with 244 and up duration at .050 lift. It will be a dog on the bottom, and will need steep gears like 4.11-5.13s just to move. Sure it will run hard after 4000 rpm, but it would suck to drive around in.
add the same to a 2V and you will have a pig that doesnt run with the 4V anyway. Clevelands have the biggest ports of any small block, that means even the 2V can make a stupid amount of power if built correctly. In stock form they are mild and tractable just like anyother OEM engine from the 70s. It doest take much to wake them up.
If you have a 4V just build it, its fine for a street car. If you have a 2V dont worry about gettin the 4V heads for it.. unless you find them cheap and in good shape. The 2V is a great engine as is the 4V. The difference is the heads and where they make the most power.
Soe people actually make the 4V ports smaller, they eliminate dead space at the bottom of the ports, that speeds up flow. It isnt really needed on a street vehicle unless its a max effort street strip car.
11-10-2006, 02:05 PM
#8
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RE: 351 Clevveland M-Code
ORIGINAL: THUMPIN455
Well the 4V makes more top end power than the 2V. The ports are freaky huge in the 4V thats the big difference. If you cam it right the 4V makes great power and still has good driveability even with the stock intake and carb. The 2V needs a 4 barrel intake and carb to make any decent power, but when you apply the right cam, intake, tuning, an headers they are an animal on the streeet.
The best way to make a 4V unbearable to drive is add a single plane intake, an 850 mechanical carb, and a cam with 244 and up duration at .050 lift. It will be a dog on the bottom, and will need steep gears like 4.11-5.13s just to move. Sure it will run hard after 4000 rpm, but it would suck to drive around in.
add the same to a 2V and you will have a pig that doesnt run with the 4V anyway. Clevelands have the biggest ports of any small block, that means even the 2V can make a stupid amount of power if built correctly. In stock form they are mild and tractable just like anyother OEM engine from the 70s. It doest take much to wake them up.
If you have a 4V just build it, its fine for a street car. If you have a 2V dont worry about gettin the 4V heads for it.. unless you find them cheap and in good shape. The 2V is a great engine as is the 4V. The difference is the heads and where they make the most power.
Soe people actually make the 4V ports smaller, they eliminate dead space at the bottom of the ports, that speeds up flow. It isnt really needed on a street vehicle unless its a max effort street strip car.
Well the 4V makes more top end power than the 2V. The ports are freaky huge in the 4V thats the big difference. If you cam it right the 4V makes great power and still has good driveability even with the stock intake and carb. The 2V needs a 4 barrel intake and carb to make any decent power, but when you apply the right cam, intake, tuning, an headers they are an animal on the streeet.
The best way to make a 4V unbearable to drive is add a single plane intake, an 850 mechanical carb, and a cam with 244 and up duration at .050 lift. It will be a dog on the bottom, and will need steep gears like 4.11-5.13s just to move. Sure it will run hard after 4000 rpm, but it would suck to drive around in.
add the same to a 2V and you will have a pig that doesnt run with the 4V anyway. Clevelands have the biggest ports of any small block, that means even the 2V can make a stupid amount of power if built correctly. In stock form they are mild and tractable just like anyother OEM engine from the 70s. It doest take much to wake them up.
If you have a 4V just build it, its fine for a street car. If you have a 2V dont worry about gettin the 4V heads for it.. unless you find them cheap and in good shape. The 2V is a great engine as is the 4V. The difference is the heads and where they make the most power.
Soe people actually make the 4V ports smaller, they eliminate dead space at the bottom of the ports, that speeds up flow. It isnt really needed on a street vehicle unless its a max effort street strip car.
11-13-2006, 02:52 PM
#10
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RE: 351 Clevveland M-Code
Concern? none.. I seek out and purchase all of them I can afford and find.. 
and I am really a Pontiac guy, the Cleveland is an impressive engine. Cant wait to get the 2V into the Cougar, it will fit better than the 4V. so the 4V is goin in the fastback.
To me its a huge bonus if it has a Cleveland in it, and HO or BOSS 351s are very nice to have. They make great street engines, no matter what anyone says. Personal experience with them has been good, since I have quality machine work done on them and I use good parts. Also I dont spin them to high, I keep them under 6500 rpm, because its just easier on a 35 year old engine.
The only way I would use a Windsor is if I couldnt fit a Cleveland in it, or if it was in my truck. True there are more parts for a Windosr, but thats because it needs them to run, like heads. I havent seena windosr head flow with a stock Cleveland yet. A slightly modified head, with the velocity plates will stomp the guts out of a windosr race head.
They are unique and somewhat rare, and engine swaps can be a pain. But the power makes up for all that stuff. just dont rpm it too much, if you keep it under 6000 rpm it will live a long healthy life.
and I am really a Pontiac guy, the Cleveland is an impressive engine. Cant wait to get the 2V into the Cougar, it will fit better than the 4V. so the 4V is goin in the fastback.To me its a huge bonus if it has a Cleveland in it, and HO or BOSS 351s are very nice to have. They make great street engines, no matter what anyone says. Personal experience with them has been good, since I have quality machine work done on them and I use good parts. Also I dont spin them to high, I keep them under 6500 rpm, because its just easier on a 35 year old engine.
The only way I would use a Windsor is if I couldnt fit a Cleveland in it, or if it was in my truck. True there are more parts for a Windosr, but thats because it needs them to run, like heads. I havent seena windosr head flow with a stock Cleveland yet. A slightly modified head, with the velocity plates will stomp the guts out of a windosr race head.
They are unique and somewhat rare, and engine swaps can be a pain. But the power makes up for all that stuff. just dont rpm it too much, if you keep it under 6000 rpm it will live a long healthy life.
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