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Old 04-23-2019, 08:43 AM   #1
bubbasimms
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250 Carb, Intake and Exhaust

I am looking for suggestions on exhaust, intake and carb for my 69 stepside. The engine is a stock rebuild with a stock style cam and the cylinders were bored during the rebuild. I am going with HEI or Petronix. It has power brakes, power steering and eventually A/C, and I am keeping the stock 3 on the tree. I have a Muncie 3 spd overdrive that I may put in later. I live in SW Missouri where it doesn't get too cold for too long. I wouldn't drive it during the winter much anyway so not too concerned with the intake heating. I am more interested in reliability and driveability. I wouldn't mind a bit more power if didn't come with any issues.

Sooo, my question is should I stick to the stock stuff or throw on some aftermarket parts? Anyone have experience taking a more or less stock 250 and adding the goodies? Does it really make a difference on a driver with an otherwise stock engine? Will I suffer from tuning, idle or driveability issues?
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Last edited by bubbasimms; 04-23-2019 at 08:49 AM. Reason: adding pictures
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Old 04-23-2019, 08:52 AM   #2
72c20customcamper
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Re: 250 Carb, Intake and Exhaust

Check out Clifford performance. He has some nice stuff
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66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark
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Old 04-23-2019, 09:28 AM   #3
cashforclunkers
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Re: 250 Carb, Intake and Exhaust

I had a worn out 250 inline in my 68 impala in highschool. It was a boat. the biggest performance increase I ever made to it and just overall made it 10 times better was fitting a nv3500 5 spd to the back of it from an s10. The closer gears and overdrive made the car a lot better at accelerating and mpg. Like a ton. It would burn rubber through 1st and chirp 2nd.

But I definitely understand keeping the original gearbox. Cool truck!
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Old 04-24-2019, 01:03 PM   #4
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Re: 250 Carb, Intake and Exhaust

https://www.shop.cliffordperformance...250-292_c4.htm
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68 C10 stepside, LS1/700R4, TCI Engineering suspension system
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Old 04-24-2019, 09:46 PM   #5
bubbasimms
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Re: 250 Carb, Intake and Exhaust

Thanks for the links and the input thus far. A decent intake, some headers and a new carb will perk up an old small block a noticeable amount. My question is do these high dollar parts make any significant difference when added to a stock 250?

Last edited by bubbasimms; 04-25-2019 at 08:23 AM.
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Old 04-25-2019, 03:12 PM   #6
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Re: 250 Carb, Intake and Exhaust

Quote:
Originally Posted by bubbasimms View Post
Thanks for the links and the input thus far. A decent intake, some headers and a new carb will perk up an old small block a noticeable amount. My question is do these high dollar parts make any significant difference when added to a stock 250?
They actually do make a difference. I once put just headers on a 250 and could tell the difference. I've read that with headers, cam, intake, and carb upgrade they can make for a fun engine to play around in. and still upset a few sbc owners.
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Old 04-25-2019, 03:44 PM   #7
57Suburb
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Re: 250 Carb, Intake and Exhaust

This is what's going on mine. Also in the middle of doing a T5 swap. Will be going EFI with it as well. Going to be an all weekend cruiser, with AC to boot.

That's Clifford stuff in the photo btw.
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Old 04-25-2019, 05:39 PM   #8
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Re: 250 Carb, Intake and Exhaust

What's your plan for the efi?
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Old 04-25-2019, 08:12 PM   #9
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Re: 250 Carb, Intake and Exhaust

I’ve been running a FiTech in my Camaro for the last 3years and love it. Just trying to decide which version to run on my 250. Leaning towards a 400 right now.
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Old 04-26-2019, 02:01 AM   #10
'68OrangeSunshine
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Re: 250 Carb, Intake and Exhaust

In my '68 C/10 Stepside I run a 292 L6 bored .030 over, with Badger pistons, Crane 260H cam, oversize 1.84'' Intake valves, inside. Outside I have a GM HEI remote coil type [ask for 1975 MY 292 cap and coil], Edelbrock 1404 500 CFM 4 bbl carb, on an Offy intake and Clifford long tube headers. I drive a Truck, so it isn't lowered or modified off stock stance. If you have any suspension mods, you may not want long tube headers. Langdons cast iron headers may work in that case. They are a ''Late Chevy L6'' iteration of the old stovebolt Fenton iron headers that the 235/261 guys loved. Tom Lowe at www.12bolt.com sells them now, as Tom Langdon retired.
Another L6-specific reference is www.inlinersinternational.org
It's another forum like ours that's all about inline engines [only]. I used to be a member. I was invited to a recent meeting of the AZ chapter, down in PHX, but they were mostly Ford guys. Go figure. Anyway, very knowledgeable people about the Straight 6 engines and willing to share their expertise.
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Every 25 years I like to rebuild that 292, whether it needs it or not.

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Old 04-26-2019, 04:47 PM   #11
cruisinthe34
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Re: 250 Carb, Intake and Exhaust

I run Clifford intake and split manifold headers, with a Holley 390 4 barrel carburetor. Yes, It wakes it up substantially. Love my setup:



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1971 C10 Inline 6 250 700R4 "Marlene"
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Old 04-26-2019, 08:26 PM   #12
bubbasimms
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Re: 250 Carb, Intake and Exhaust

That's a sweet setup....where did you go for the accessory brackets?
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Old 04-27-2019, 06:13 PM   #13
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Re: 250 Carb, Intake and Exhaust

The accessory brackets are from ECI Hot Rod Brakes. Nicest I've found.

http://www.ecihotrodbrakes.com/

Also run a valve cover from 12 bolt.com

Better link
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My Build Thread: http://67-72chevytrucks.com/vboard/s...=morning+glory
1971 C10 Inline 6 250 700R4 "Marlene"
1934 Chevrolet Master Sedan 350 700R4 "Iris"
1941 Ford 1/2 Ton 5.0 H.O Roller C-4 "Rose"
2019 Honda Ridgeline

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Old 04-27-2019, 06:33 PM   #14
Ronzo
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Re: 250 Carb, Intake and Exhaust

Bubba, what a beautiful truck brother.
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Old 04-28-2019, 10:06 PM   #15
bubbasimms
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Re: 250 Carb, Intake and Exhaust

Those brackets are great...think I'm gonna get those instead of the Davis speed setup. Ronzo you talking to me?
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