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Old 04-01-2015, 08:00 AM
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chevy impala

So i have a 65 chevy impala which has a 250 in it.
I have another 250 lying around and i want to build it for street, looking at prox 200hp (or more) but I would like to get the rpm range between 1500-2000 rpm.
So i was thinking about the following (had some tips on another forum already but since you guys shoul be more into these things i ask it here)
btw regulations make it not possible to install a v8 or bigger engine...
rear differential will be changed a some point to get lower cruising rpm (70mph)

1 Should or should i not turbocharge it, and can i take a turbocharger from another car and install in the chevy?

2 what size exhaust should i fit and dual pipe or single?

3 i'll be looking for a 292 head to put on it so i can fit an offenhauser intake, and some kind of exhaust system but what is best: manifold or headers?

4. carb will be a +-350cfm (max 500 unless i have to go up because of the turbo) don't know the brand or type since i don't have it yet and will look at what is found.

5. what would a good mild cam be (and where to buy) or is stock good enough

6. i probably forgot some stuff so feel free to add.

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Old 04-01-2015, 08:44 AM
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Here's a link with all kinds of ideas for you.
Tricked-out Chevy six cylinder engines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

You don't need a 292 head. Your 250 head is exactly the same one.
Best headers are Langdon's.
Look here.
Langdon's Stovebolt | Specializing in Inline Six Cylinder High Performance Parts

You need this book.
Chevrolet Inline Six-Cylinder Power Manual, 2nd Edition: Everything the engine builder and enthusiast needs to know to rebuild the Chevy six for power. by Leo Santucci | 9781931128278 | Paperback | Barnes & Noble
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Old 04-01-2015, 09:44 AM
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Quote:
Originally Posted by RWENUTS View Post
You don't need a 292 head. Your 250 head is exactly the same one.
Best headers are Langdon's.
Look here.
Langdon's Stovebolt | Specializing in Inline Six Cylinder High Performance Parts
well the head on the engine and on the one in the car is an integrated head so i need a 250 or 292 without the integrated manifolds...

performance minded it would still be the same? i mean between a non integrated 250 and a 292?
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Old 04-01-2015, 10:19 AM
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Yup!!
Same head, same performance!
Get Leo's book.
Another good bang for the buck is upgrading your stock dizzy to an Hei.
Like this.
Chevy Inline 6 Cyl 230 250 292 Hei Distributor 6522 R | eBay
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Old 04-01-2015, 11:06 AM
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Be careful choosing the cam, you are looking for a particular cruising rpm's, so the cam will have to be very mild. Here, for instance, is what I might use if I were building a motor for you.....
Crane H-192/2667-2S-12
Brute low end torque, smooth idle, daily usage, fuel economy
1600-2200 cruise rpm
7.75:1 to 8.75:1 compression ratio advised.
Operating range 800-4200 (motor will rpm higher than this, but 800-4200 is where the most power is made).
0.050" duration 192/204
Advertised duration 248/260
Lobe separation angle 112 degrees
Valve lift 0.467" / 0.498"
This cam would work great with a turbo.

Read through this tutorial a few times to learn how to make a flat tappet cam work....
http://www.crankshaftcoalition.com/w...ips_and_tricks

I would urge you to purchase a book such as this one and read up on turbos. There's quite a lot of info that you need before you begin a turbo project. Check out the used books on this page. I buy used all the time to save a few shekels....
Amazon Amazon

.

Last edited by techinspector1; 04-01-2015 at 11:17 AM.
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Old 04-01-2015, 04:18 PM
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hi
i will certainly have a look for the books,
the car already has a HEI installed (it a late 70s engine in it and the other engine is a '77 so both has them) but i will certainly check gearing first before reusing one of them
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Old 04-01-2015, 10:47 PM
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Where are you located??

What regulations say you can't install a V8 engine??.

Even states with tough restrictions allow changes in vehicles that old. Rules are usually 20 or 25 years old and older then you can do whatever you want.

You will spend two times as much rebuilding a stock or mild Inline 6 than you will building a mild performance Small block Chevy, and the mild Small block will make 1-1/2 to 2 times the power and get just as good gas mileage.
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Old 04-02-2015, 01:25 AM
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. X 2... where do you live that allows adding turbos but not V8's?

. In order to cruise 70 MPH at 1500 RPMs in one of the biggest (and nicest) cars ever made ('65 Impala), you need a good sized torquey engine... which an older 6-banger isn't... although a properly designed turbo setup could help that...

. If going turbo, don't need the Offenhauser intake, just use the stock intake and exhaust... followed by a large single or dual exhaust system...

. Although for a V8, this article can give some ideas on turboing, sources, and prices:

Cheap Turbos From eBay On A 350 Small Block Engine - Car Craft Magazine
.
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Old 04-02-2015, 04:19 AM
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i live in belgium and the reason i can add a turbo and not a V8 is because when they imported the car they had put on paper what engine was in it so i'm stuck with a 250 (with a small +-3% i can go larger) so to get a V8 equal on torque i need at least a 300, don't get me wrong here but if there is one thing i learned about the sixes (my ford is a 300 L6) is that you need a larger V8 (stock it is then) to get the same torque.
And to find a V8 of less than 260cid is nearly impossible here and the prices are about 1000dollar for an old used beaten up v8...
I don't need to have exact 1500rpm at 70mph but i don't like it to run at 3000rpm at 70mph... if i can get as low as 2000-2500 for 70 i'm happy with it but how low can you go...

for turbo's there's a companie near where i live who stock thousands of rebuild turbo's from al kinda vehicles coming from big rigs to small town cars. the only thing i'll need to know is what size i need...so i can look in what car/truck it was build in and then i can get one...
price of a turbo: 500-1200dollar (without any setup)

anyway thanks for the advice already
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Old 04-02-2015, 04:33 AM
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. OK... since you have a 250 cubic inch engine, you would look for a turbo off about a 225(3.5L) - 300(5.0L) cubic inch engine... or two turbos off two 125 - 150 cubic inch engines... or twin turbos from a 225 - 300 inch engine... grab as much stuff as you can that's connected with the turbos... including turbo vacuum/pressure gauges... intercoolers... blowoff valves...

. Decide between pull through carb.s, blow through carb.s, or EFI...
.
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Old 04-02-2015, 05:34 AM
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ok so i'll be on the lookout for the turbo setup,
I know the best way would be EFI but it would be easier to use a carb.
so now i just need to know what is best (for the turbo and for performance) blow through or pull? my guess is pull through doesn't stress the carb as much but i don't know if i'm right.

btw do i have to lower my compression when installing a turbo?

ps about the regulations: belgium is this bad you can't even pass the emisions if your emissions are too low... (so too clean no good...)
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Old 04-02-2015, 05:41 AM
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. The pull through runs gas through the turbo compressor... the blow through just air, but the carb. has to be setup to work under vacuum and pressure... as seen in my link above...

. The six already has low enough compression ratio... limit boost to 3-4 psi on stock pistons...
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Old 04-02-2015, 12:08 PM
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Likely, most of the turbos you will have access to there in Belgium will be units that were used with OEM EFI setups and therefore will be blow-through units. Here are a few links to the blow-through carburetor specialists .....
Blow-Thru Carburetors
Blow Through 750¬*|¬*Carburetor Solutions Unlimited
How CSU Builds Blow-Through Carburetors - Dragzine
Demon Carburetion Mighty Demon Blow-Thru Carburetors - Free Shipping on All Orders @ JEGS
Inside Demon's Blow-Through Carb
Pro Systems - Blow Through Carburetor
Read through the book I linked or another like it before you go any further.


"ps about the regulations: belgium is this bad you can't even pass the emisions if your emissions are too low... (so too clean no good...)"
Are you saying that if your vehicle showed zero emissions, you'd fail?
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Old 04-02-2015, 01:32 PM
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techinspector1
indeed that's what i'm saying, my chevy ran on propane and therefore had near to zero CO and CO≤ emission and they said: this can't be something is wrong with your vehicle... so i didn't pass... now i'm getting rid of the propane to run gas
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Old 04-02-2015, 01:38 PM
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Frankly, I think this is kind of a cool project. I'm in favor of anything that's not a belly-button SBC. Do you really think your inspectors could tell the difference between a 250 and 292 engine? That would be a much more effective package. Consider a 200-4R overdrive trans to get your cruising RPMs down without losing off-the-line acceleration.
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