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283 horsepower-upgrades

 
pacsiah
I love my Chevy Chevette!
Posts: 3
Joined: 05/08
Posted: 05/12/08 04:26 PM

hello everyone. im looking for simple upgrades to my original 283 - powerglide - 3.08 posi thats sitting in my '67 nova. i was hoping for a new manifold/carb first, along with a pertronix ignition system. ive read in an old chevelle magazine, swapping in a Holley 570cfm street avenger and street dominator manifold, on a 283 with positive results, but the Holley tech people are saying the 570 is too much for the 283? any ideas on carb/manifold combinations that would work on my small block? swapping in a 350 isnt an option.
just looking for a little more horsepower.
cheers!  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 05/12/08 04:47 PM

It can't get much smaller than 570 CFM! Besides, flow-rating has nothing to do with how well a carburetor is sized to an engine combination. Why else would there air valves rated in the THOUSANDS of CFM for fuel injection systems?

What makes an engine seem 'over-carbed' is poorly atomized fuel. I'm pretty confident than the venturi diameter of a 570 CFM Holley IS NOT too big for your near-stock 283.

You need a small dual plane intake as your 283 needs all the help at the bottom-end that it can get, 3.08:1 gears are awfully tall for a little 283!  
~Gibs

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pacsiah
I love my Chevy Chevette!
Posts: 3
Joined: 05/08
Posted: 05/13/08 10:55 AM

so you believe the holley 570 with a dual plane would work fine on my motor? with some HP gain? i just figured replacing my 2 barrel and stock intake couldnt hurt. regarding rearend gearing, what would you recommend? - 3.36? 3.42? this would be running with my powerglide of course. however a th350 upgrade could also be in my future...?
thanks for the comments!
p  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 05/13/08 11:02 AM

A 3.36:1 gear should raise the rpm band 300-400 over the 3.08's. A 3.73 may be in order, which would raise the rpm range approximately 550-650 rpm.

An extra speed couldn't hurt. I'm sure that you're using a tight converter and the 283 would like a little extra gear multiplication.  
~Gibs

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roundthebend
I love my Chevy Chevette!
Posts: 6
Joined: 05/08
Posted: 05/15/08 10:14 AM

I have an Edelbrock 600 on a stock spread bore intake with an adapter on my 283. It works fine for what I do which is just cruise with it.  Ithas better bottom end than with the original 2 barrel but other than that I cannot tell much difference as far as cranking, idle, throttle response, etc. In other words, in my humble backyard opinion, you would be ok with the 570.  

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pacsiah
I love my Chevy Chevette!
Posts: 3
Joined: 05/08
Posted: 05/16/08 01:20 PM

thanks for the info guys. would a cam upgrade help balance out this problem of 'too much carb'? if so, any recomendations?
cheers
paco  

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darrenswanson
I love my Chevy Chevette!
Posts: 3
Joined: 05/08
Posted: 05/16/08 04:59 PM

283 make it run like the best one made in the 50's,use a extreme green camshaft from precision engine, 1-479- 968-1441 cam kit about $300.00 saves money,smoother idle,overalleconomy,performance,& torque.  just like they used to have out run anything!  

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darrenswanson
I love my Chevy Chevette!
Posts: 3
Joined: 05/08
Posted: 05/16/08 05:06 PM

same as info. as pacsiah , early 283 came out with 500 carb. ok  

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