Engine differences (2v, 4v?)
 

What does this mean? 351w 2v? I assume they are carberators, but what is preferable, the advantages and disadvantages of each, etc. Thanks!

The v stands for ventourri. These are the "barrels" in a caburator. a 2-v is a 2 barrel, and a 4-v is a 4 barrel carb. Obviously, a 4v is the carb of choice. Get a good caburator book to understand the fine points. I think Holly or Demon is the carb of choice. I bet most will agree with me here.

Rev

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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

You might be referring to the heads that came stock on various 351W engines. The 4-v heads probably flowed a little better to accomodate the 4-v induction system. What exactly were you referring to?

Rev



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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

Rev

The ports and valve sizes on 351 windsor heads were the same, regardless of the 2 barrel or 4 barrel applications.

Im not sure if your refering to the 351 cleveland, now they had diffrent heads depending on what the carburator was. Two totally diffrent heads.

I know my spelling sucks. I am not an ignorant moron, just a really bad speller. http://www.mustangworks.com/interact...oard/smile.gif

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64 1/2 Red Mustang Coupe. 289, C4, 3:1 rear gear. Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 windsor valves, high side of 10.5:1 comp, 1.7:1 sled rockers, blue wolverine lumpy cam, autolite 4100 Hipo 4 barrel. And to many others to list

2000 Perf Red Mustang GT. 5spd.

64 1/2 red 6cyl coupe. Auto. project car.

[This message has been edited by Mercury (edited 01-01-2001).]

Nope, I just didn't know for sure if the 351W 2-v and 4-v heads differed or not. I did know about the 351C heads differing 2-V to 4-V. I wasn't quite sure what the question was. The early ('69) heads are supposed to be best. The newer ones had big chambers (69 cc)and little valves (1.77/150) I think with similar runners. Mine are 185/155 and have 9 1/2 CR with Flat top forged pistons. Thanks for the info as to 2-V/4-V 351W heads.

Rev

rev

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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

I have been meaning to get my hands on a 351W block. I called Mustang Salvage in Orange and they said they could get me a 351 2v short block for $300 but he insisted that there was a difference between the 2v block and 4v block. Obviously I would prefer to have the better block so if there truly isn't a difference that would be great. I am concerned that maybe a 4v is a 4 bolt main where as the 2v may not be.

$300 for a 351w short block (i assume it needs to be rebuilt) sounds too high. i suggest you shop around a little more.

Hmmm a four bolt windsor block is a definite rarity. Might be that the block castings are from diffrent years, the heads in certian years did have diffrent valve and cumbustion chamber sizes but there was no diffrence in heads from a 4 barrel and 2 barrel setups.

Maybe the one block thats cheaper has had been bored already once before, or might have a sleeve in it. Ask them what the diffrences are, see if there Bull Shtin you. I've known for Mexican Windsor blocks to be refered as 4v blocks, but that was buy a rip off junkyard here in Fayetteville.

Now the Mexican blocks have thicker main bearing caps and a higher nickel content in there castings. Hope I was able to help out in some way.

Frankley I didn't wrestle with the price much. He probably would have come down but as soon as he said the 4v was different than the 2v I lost all interests.

I think the only 4 bolt main 351 was the Boss 351. Weren't all the other 2 bolt mains?

Rev

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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

I've never heard of 2V and 4V blocks. Sounds like some guy is making things up. The mexican 302 blocks are easy to identify. They say heco in mexico in the lifter valley. I've goe one of those in the carport.

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1995 Mustang V6,automaatic
1966 Mustang
The long term project
1983 Mustang GT
The 460 project

Ok, well here is another question (might sound stupid, not familiar with old cars. Remember I am of the 4 banger generation. http://www.mustangworks.com/interact...oard/smile.gif There are a lot of people saying the 289 i the most versatile engine. But if I want to go fast, (especially stock) wouldn't I want more displacement? Surely stock, the 351 goes faster than the 302, which goes faster than the 289?

I have been around these motors for quite a while and I have never heard of a difference between a 2v or 4v block - they are the same. The heads for a 2v or 4v on the windsor are also the same (1.78" / 1.54" valves), only the cleveland udes different heads for a 2v or 4v. Also pretty sure that the only 4 bolt main block was the Boss 351

Johnny K

The engine displacement does effect the power that the engine puts out. To a degree.

You can make a 289 sing now, trust me I know. Its a great little engine, it has the same attributes as the others in the WIndsor family.

It all depends on the tune of the engine. Nothing impress's the newer generation bow tie boys like telling them after you beat them that you only got a 289 under the hood. http://www.mustangworks.com/interact...rd/biggrin.gif For some reason they think the ol 289's are slouches.

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64 1/2 Red Mustang Coupe. 289, C4, 3:1 rear gear. Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 windsor valves, high side of 10.5:1 comp, 1.7:1 sled rockers, blue wolverine lumpy cam, autolite 4100 Hipo 4 barrel. And to many others to list

2000 Perf Red Mustang GT. 5spd.

64 1/2 red 6cyl coupe. Auto. project car.

289/302/351W are all very similar. You can get probably almost the same hp numbers out of all of them. On the dyno 289/302 would probably be almost identical with the same heads/cam etc. When the 302 came out in 68, it had little or no power advantage over the 289. The 351W does have a displacement advantage that adds some torque and lets you get the same or more power at lower RPM's.
Displacemet makes a difference, but just because I have a 351W it does not mean that I will beat every 289 stang that I see.


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67 Fastback - Arctic White Pearl paint
351W 415 hp, Trick Flow Alum. Heads, C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.

http://www.mustangworks.com/mustangs...1245-slot2.jpg

4v motor had flat top pistons,2v had dished pistons. Valves were the same as were everything else. 1969-74 351 heads are the larger valve variety. Untill 76 the blocks were the heaviest 20lbs+ more iron in the webbing. 77 and up are weak blocks,(In high horsepower apps.) http://www.mustangworks.com/interact...oard/smile.gif

But I am trying to make this real fast, on a real limited budget. I assume I should start out with more displacement?

Real Fast and a Real Limited Budget are incompatible phrases. Check out MustangSteve's 351W build page ~ $5k for 400hp from a 351W. You may be able to go real fast on a limited budget --- but only for a short period of time. The cheapest way to go real fast is NOS, but without properly perparing the motor, expensive things will turn into scrap.

go with the 351W it won't cost much (if any) more than a 289/302

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67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Alum. Heads, C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.

My 351W Fastback

Everyone doubts me. http://www.mustangworks.com/interact...oard/smile.gif I am positive I can make a fast car on a real limited budget. I will be doing all the work myself, including painting and what not (always wanted to take a stab at painting).