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351w vs 347 stroker which would make more power

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Old 09-06-2012, 01:21 PM   #1
white95gt
 
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Default 351w vs 347 stroker which would make more power

I'm building a 1/4 mile 10 sec street car I was told to build a 347 but why not just build a 351w with the heads cam intake and what not. Wouldn't the 351 make more power?
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Old 09-06-2012, 03:17 PM   #2
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Benefits of a 347 is it's easy and cheap since you already have the 302 block. Nothing really changes except for the internals and it bolts right in.. If you have the extra money though go with a solid 351 that's been freshened up, and if you really wanna have fun do a 408 stroker.. Of course, it just depends on what you want to spend. The reason someone recommended the 347 is because it's an easy 10 sec car.. If you're wanting something serious than go bigger.
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Old 09-06-2012, 05:58 PM   #3
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Well I can get a 351 for 200 complete oil pan to intake. Then I'd have to have it cleaned. And everythang new oil pan transmission the 347 might actually turn out cheaper
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Old 09-06-2012, 07:49 PM   #4
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im going 351 block, you can make more power safely. popular belief is that a 302 block can only handle 500 horses max, a 351 block can handle 500 very comfortably.
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Old 09-06-2012, 08:24 PM   #5
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thats why i am leaning more toward the 351w build cause once the car is in the 10s i might decide to spray it one day and i wanna feel comfortable knowin when i leave the line sprayin a 100-150 shot it will more then likely hold
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Old 09-06-2012, 08:48 PM   #6
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That all depends on assembly, machine work, tune etc, a 351w is no better unless it is done right either! cubic in for cubic in 351w with a similar setup will more times than not be out performed by the 347!

I know where plenty of stock block 347s are that make more than the block limit and are still holding strong! It is all in a sound starting block and getting everything right after that...

Will it hold forever? no, will a 351w last forever? no!

Its in budget and what you plan to do in the long run.... If you are gonna stay around 150 shot of nitrous then its fine on a 347 with a quality balance job with a quality assembly with a good tune!

I spray a little more on mine but i`m just curious lol! I also have a progressor!
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Old 09-06-2012, 09:22 PM   #7
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All you need to do is compare the bottom end of the two, the main area of a 351W is much heavier than a 302. Plus you dont have the oil ring right against the wrist pin with a 351W. The only advantage... if you can call it that is a 347 will be lighter.
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Old 09-06-2012, 09:41 PM   #8
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the car is gonna be a daily driver i wanna keep it a 5 speed but unless i can afford a tremec ill go built c4. I will go with trickflow 205cc or 225cc twisted wedge heads, 1.6 roller rockers, custom grind nitrous cam, edelbrock efi intake.
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Old 09-06-2012, 09:57 PM   #9
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Quote:
Originally Posted by white95gt View Post
the car is gonna be a daily driver i wanna keep it a 5 speed but unless i can afford a tremec ill go built c4. I will go with trickflow 205cc or 225cc twisted wedge heads, 1.6 roller rockers, custom grind nitrous cam, edelbrock efi intake.
I have had both, stick is alot more fun to street drive and the C4 will be more consistant at the track... to buy a C4 that will hold that much power reliably you are looking at around $1,200. That is a good bit cheaper than a TKO 500 or 600 for sure.
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Old 09-07-2012, 12:43 PM   #10
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i want a reliable street car that makes 10 second passes. I know ill have to fork up some money for it to be reliable and i am ok with that ive lost my license for a year so it gives me time to build it. if i went with a automatic id put a reverse manual valve body in it.
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Old 09-09-2012, 07:21 PM   #11
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351 based engine is way to go i did the 347 aluminum head build was happy till friend built 351 .30 flat tops and dooe heads cost him less in long run and was quicker in 1/4 and 1/8 mile so built almost the same but roller and happier now
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Old 09-10-2012, 07:25 AM   #12
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Default 351 or 347

The rod angle is different on the two engines, and where they wiill want to make power in the RPM range is different. The 347 has the shorter rod, and will tend to wear out the bores sooner, needs a different cam . The 351w is a 9" deck block, main bearings are too big (Cleveland deck is lower, more on the order of a SBC, uses a shorter, lighter rod, still a much more longevity than the 347, and has smaller main journals than the 9" deck). If I had the choice, Id build a cleveland deck with the trick flow heads, roller rockers, good rods, custom pistons, flat tappet cam with even duration, 140lb seated springs, square deck the block, and balance and clearance everything, port match the intake, make sure that the exhaust has a reversion dam. Anyway, IMHO, the cleveland deck is better, lighter, piston/rod combo and pretty explosion proof. Just a thought
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Old 09-10-2012, 09:01 AM   #13
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Wouldnt it cost significantly more to go w a Cleveland? Since all of the parts needing to be swapped will have to be custom made, like headers etc etc
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Old 09-10-2012, 10:50 AM   #14
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Quote:
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Wouldnt it cost significantly more to go w a Cleveland? Since all of the parts needing to be swapped will have to be custom made, like headers etc etc
The windsor heads will fit the cleveland block. If you are going to use a cleveland block you will need the cleveland crank or a motorsport crank clearanced for the block in front as the counterweight wont clear(ask me how I know this!). I think that a lot of manifolds will fit. Its not easy, but it will make for a lighter piston/rod/bobweight. If you arent going to put a ton of power thru it, the cleveland cast crank will work.. The headers should fit. If you use the cleveland heads, yes, you will have to use a header kit and make them up. I always like d the cleveland heads, they flow really well(almost too much) and they have canted valves. I dont know if they are superior to the Trick Flow, tho.
Aussie 2bbl heads have better flow as the ports are smaller, giving more velocity than 4bbl heads.
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Old 09-18-2012, 02:02 PM   #15
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Im still in the debating stages as of now. Ive talked to a couple ppl and most of them tell me to just turbo my car and run it till it blows
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Old 10-01-2012, 03:16 PM   #16
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The way I see it it's 351w hands down. I've debated this in my head a thousand times and my conclusion is there's no way I'm going to spend the kind of money required for machining, parts plus putting together a 347 with a factory 302 block....F that!! I want to do it once so if I did I would have to go with a Dart block and that just throws the whole budget out of wack then the sound choise is the 351w, starting the project a step ahead of the 347.
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Old 10-02-2012, 01:15 AM   #17
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I think if you are considering 347 vs 351 and not the 351 stroker option the main benefit is strength. The 351 has 4ci more but also a larger heavier rotating mass. You can get away with a 185 head on the 351 easily. Basically whatever would work on the 347 will work on the 351 other than intake, oil pan, distributor and headers. Short block weight between the 2 is around 50lbs. Put your battery in the trunk and you will never feel the difference. Add aluminum heads and the nose will start getting lighter than stock.
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Old 10-02-2012, 05:25 PM   #18
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351W all day. To build a 347 you're already going to have to pay for the stroker kit, pay for machining and assembly costs, unless you have the tech know how to assemble it properly yourself, and you wind up with a weaker block and still have 4 fewer cubes than me. Get your Windsor, if the bottom end is stout, leave it alone. A set of AFR 205's, a properly matched intake, and if its not a roller, pay the extra couple hundred for the retrofit lifters and pushrods. Get the right cam and you'll be making gobs of low end torque perfect for stoplight to stoplight raci... er... driving. Assuming you already have a 302 car, a Windsor will bolt right up to your tranny. You said you've got a year to do this, think about it and do it right.

Then again, I may just be biased.
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Old 11-10-2012, 12:12 PM   #19
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From a cost standpoint it is a no brainer. 351w all the way. Just remember to use the best possibe main and rod bearings available. I would also use the best oil possible. Because the 351 was designed as a truck engine it has larger main journals. These do not like high rpm. Do not use any factory ford iron head. They are all junk. A good set of alum heads and the other basic internal up grades and you are on your way. I always wanted to build a 351w stroker for my but never did. To get 10 sec on a reliable daily driven car is going to be a litttle tricky without a good bit of $$$ invested.
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Old 11-11-2012, 09:57 AM   #20
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Quote:
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I'm building a 1/4 mile 10 sec street car I was told to build a 347 but why not just build a 351w with the heads cam intake and what not. Wouldn't the 351 make more power?
depending on your budget both engines will get you to where you want to go RIGHT NOW.If you want to go faster later...and you probably will...start out with a 351 .
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Old 11-11-2012, 09:57 AM
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