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283 horsepower-upgrades

  
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283 horsepower-upgrades

 
pacsiah pacsiah
New User | 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!  

GibTG GibTG
Guru | 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

pacsiah pacsiah
New User | 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  

GibTG GibTG
Guru | 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

roundthebend roundthebend
New User | 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.  

pacsiah pacsiah
New User | 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  

darrenswanson darrenswanson
New User | 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!  

darrenswanson darrenswanson
New User | 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