More power down low?
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From: FL
More power down low?
It seems that most of the builds being outlined on the web are focusing on building power higher in the RPM range than I will ever hit with my F-250. What I would like to do is build one that developes all of its power between 1k and 4,500 RPM but want bigger numbers than I have seen with most 460's built for that kind of power curve. Most seem to peak at about 300hp and 450 for tourqe. What would it take to devlope something in the neighberhood of 400+hp/500+ftlb tourqe under 4,500 RPM ? Are these #'s even possible or am I dreaming?
I am willing to build a stroker if tha is what it takes, but how big will I have to go?
This is what I have to work from as of now. 429 dove block and heads
(2) 460 dive blocks and d3ve heads (one of witch has truck rods)
At first I thought that I could throw the 460 crank and truck rods in the 429 and reach my goal with the proper cam, 0 deck, porting, and a healthy c/r........... but now I have my doubts after doing more reading here and at other sites. So can it be done? If so I sure would like to hear some words of wisdom before I start the machine work.
I am willing to build a stroker if tha is what it takes, but how big will I have to go?
This is what I have to work from as of now. 429 dove block and heads
(2) 460 dive blocks and d3ve heads (one of witch has truck rods)
At first I thought that I could throw the 460 crank and truck rods in the 429 and reach my goal with the proper cam, 0 deck, porting, and a healthy c/r........... but now I have my doubts after doing more reading here and at other sites. So can it be done? If so I sure would like to hear some words of wisdom before I start the machine work.
Elder User
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From: Crooked River Ranch, OR
You'd probably have to add a Turbo or Supercharger to achieve that kind of power under 4500 RPM.
Add another 1000 RPM and you can achieve those numbers with a carbed 460 with proper heads, cam, compression, etc.
Deen
Add another 1000 RPM and you can achieve those numbers with a carbed 460 with proper heads, cam, compression, etc.
Deen
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From: FL
more questions for you
Thank tou for the reply. I was afraid that was what I would hear. Can anyone tell what #'s a can expect from a stroker in the neiberhood of 521cu.in. built for the power curve that I am shooting for? I have done some research on the turbo option and it doesn't look like anything that I would wan't to attempt however I would like to hear from anyone that could give me any information on going with a blower. I know that several people have chosen this option but I havn't been able to come up with much information with the searches that I have done. Any info. that anyone could provide me on the subject would be greatly appreciated. It looks like I have my homework cut out for me.
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From: Nevada
Not to argue with Deen's wisdom, but if you're talking 400hp at the flywheel, I don't think you'll have any problem reaching that (4500-5000rpm tops) with your 460 components. A moderate porting job on the heads, 9.5:1 c/r, aftermarket intake/carb, full tube headers and any decent aftermarket cam should get you there. The early 460s were rated at 365hp with restrictive heads, crummy exhaust manifolds and 2' exhaust well under 5000rpm. I'd look for a cam that makes power starting at 1200-1500rpm and run some combos throught DeskTop Dyno to see what you need for a cam.
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From: Tampa
No name, Is it carb. Or fuel inj. If it is carb.change the carb.go to a domanater class that will add around 100ph 429 and 460 love to breathe. Big headers 1 1/2" at the head 3"or 4" at the muffler and run it to the back. I've got an f-250 with a boss 429 I'm dumping around 800hp -\+ at the wheels, I also have about $10,000.00 in the motor. Did have something new give to me a bill for 25000.00 for new asphlate,did a burn out took up the road. Going to court over it. LOL Also have NOS.
Elder User
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From: Crooked River Ranch, OR
George,
It will be interesting to see what you come up with...I took him literally when he said "ALL of its power between 1K and 4500 RPM". Then a little later he states: "400+ HP/500+ ftlb torque UNDER 4500 RPM"...
Deen
It will be interesting to see what you come up with...I took him literally when he said "ALL of its power between 1K and 4500 RPM". Then a little later he states: "400+ HP/500+ ftlb torque UNDER 4500 RPM"...
Deen
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From: Nevada
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From: FL
Thanks for your help guys. The reason I said that i wanted the power between 1000 and 4500 is that I thought that the average power curve is right about the 3500RPM range and that you could move this power curve up or down the RPM range through diffent cam selection and head work. I want good power to start about 1k if you can obtain good broad power curve beyond 4500 that would be great. I don't see me turning over 5000 ever but what I am looking for is a broad power curve kicking in around 1 grand. Most of the builds that I have read about don't reach the #'s that I want or have a very narrow power curve that peeks well over 4500 RPM well beyond the range that I will be running. I guess what I am trying to say is a motor that gets the #'s that I want but does't start pulling hard untill 2, or 2500 Rpm an peeks 6k or higher won't help me much. I just want some words of wisdom how to max out what I can get in the RPM range that plan on running.
If I have to go with a stroker I will. However, I'd rather not have to go with a supercharger. What kind of #'s can I expect from a stroker in the neighberhood of 520cu.in. optimized for what I want?
I hope this cleared up what I was trying to ask. Sorry for the confussion.
If I have to go with a stroker I will. However, I'd rather not have to go with a supercharger. What kind of #'s can I expect from a stroker in the neighberhood of 520cu.in. optimized for what I want?
I hope this cleared up what I was trying to ask. Sorry for the confussion.
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From: Nevada
Deen's right, 400ftlbs of torque and 375hp is about it using a cam for 4500rpm max torque with stock heads, headers, 750 carb and dual-plane intake manifold. More cubes won't do it without more rpm.
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From: Tampa
no name, the poop on the cams,factory cam 360 +/- hp 429/460 cu.in basic rpm 1000-4000 this is for the years of 68-97 covering 370-429-460 (7.5)cu.in. This is from the ford cam book. Now to reach close to what your liking, this is ball park and Deen can run the #s and see how close it is, the cam is the saturday night special #H-288-2 rpm on this cam is 2500-5500 www.cranecam.com need to open up the heads, headers, good intake (RPM), carb. 800cfm or little larger this cam has a lift of .522/530 also 11.0 would be good, pop in a good stall converter 2500-2800 the stall will get you in the power curve of the cam. Just some thoughts. there is a book call Ford big block biulding most speed shops have it.
Last edited by dogman; Nov 22, 2003 at 05:25 PM.
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From: Nevada
Deen posted that he could easily achieve his objectives with another 1000rpm. He said he wants 1000-4500rpm.
2500-5500 power band would be a dog off the line without a 3000rpm stall converter and require guideplates and hardened pushrods. .522 is about as much lift as you can use on the 385 without going to roller rockers or risk popping keepers with a stock valve train.
2500-5500 power band would be a dog off the line without a 3000rpm stall converter and require guideplates and hardened pushrods. .522 is about as much lift as you can use on the 385 without going to roller rockers or risk popping keepers with a stock valve train.
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From: Crooked River Ranch, OR
George,
Thanks for running the numbers and checking this out for everybody. I have Desk Top Dyno also and have run numerous combinations over the last few years and didn't remember ever coming up with impressive figures at the lower RPM ranges.
No name,
For what your trying to do will be a fairly expensive project. Building a stroker or running a supercharger costs money and to complete the project I can easily see you spending $5,000 or more. You'd be better off trading your truck for a turbo-diesel (as much as I hate to say it). A turbo-diesel will get you impressive numbers...all below 4,000 RPM. Of course...that's another Forum...
Deen
Thanks for running the numbers and checking this out for everybody. I have Desk Top Dyno also and have run numerous combinations over the last few years and didn't remember ever coming up with impressive figures at the lower RPM ranges.
No name,
For what your trying to do will be a fairly expensive project. Building a stroker or running a supercharger costs money and to complete the project I can easily see you spending $5,000 or more. You'd be better off trading your truck for a turbo-diesel (as much as I hate to say it). A turbo-diesel will get you impressive numbers...all below 4,000 RPM. Of course...that's another Forum...
Deen
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From: FL
I appreciate everyones input. I think that I'll just build a 520 and shoot for the best. I don't plan on getting it back in the truck untill later this Spring but I will get her on a Dyno in West Palm an post what I get.
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