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  #16 (permalink)  
Old 04-24-2013, 09:48 AM
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you dont even need 283 stickers; fingerpaint "283c.i." or "301c.i." on the fender and scuff it with a scotchbrite. Use a oil fill pipe with a breather on it and the 1965(?) corvette PCV setup to avoid having to drill the valvecovers. This will eliminate the road draft tube and the gnarly mess it can make. The OP needs to decide if hes trying to impress the rabid traditionalists and their single pot master cylinders and checking casting numbers; or the other 97% of us that say "Wow man, what a killer car and it LOOKS straight out of 1965!"
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  #17 (permalink)  
Old 04-24-2013, 10:03 AM
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I do not know why you want to build up a 283 to make 450HP. Throttle response at the low end is going to be sluggish because most of the torque has gone upstairs. You are better off starting with a 383 then build it up. Take the 202 heads and use it on a 383 with flat top pistons. Get a cam that has a 480 lift and a 110 lobe separation. Then you can use a TR1X Tunnel Ram with a pair of Holley vacuum secondary 390 CFM List # 8007. (780 CFM, total). You will get more then enough torque to smoke the tires at the low end and be pulling easy 450HP. Drop that 383 in place of the 283. They will never tell the difference.

HOLLEY 390 BRIGHT ZINC 2 X 4 TUNNEL RAM CARBS
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  #18 (permalink)  
Old 04-24-2013, 10:21 AM
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Originally Posted by lg1969 View Post
I do not know why you want to build up a 283 to make 450HP. Throttle response at the low end is going to be sluggish because most of the torque has gone upstairs. You are better off starting with a 383 then build it up. Take the 202 heads and use it on a 383 with flat top pistons. Get a cam that has a 480 lift and a 110 lobe separation. Then you can use a TR1X Tunnel Ram with a pair of Holley vacuum secondary 390 CFM List # 8007. (780 CFM, total). You will get more then enough torque to smoke the tires at the low end and be pulling easy 450HP. Drop that 383 in place of the 283. They will never tell the difference.

HOLLEY 390 BRIGHT ZINC 2 X 4 TUNNEL RAM CARBS

First I need to say, to LG1969 that I am sorry I have to use this post to make an example of as there are millions like it, but this is the most recent one.

When talking cams, lift and LSA alone are about as close to useless as you can get. An LSA by itself is also useless and makes you look like a complete ******* (this is discussed a LOT) to people who understand what a camshaft is.

If you have it in the context of a duration, then LSA is pretty significant. Don't talk LSA without talking duration, its like trying to drive a car on 3 wheels- you'll do more harm than good. There are some small exceptions to this, but even then duration are "assumed" or "understood" not simply forgotten about.

Secondly Tunnel Rams do NOT share carbs, at least not to a large extent. They are a step towards IR induction which does not share carb capacity at all. A pair of 390's on a tunnel rammed sbc is actually really small, even for a 283. A set of 500's would be more appropriate for a street car.


Again, I apologize singling out this post as these are two VERY COMMON misunderstandings people have and I'm trying to prevent the further spread of misinformation.

Rant done.
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  #19 (permalink)  
Old 04-24-2013, 10:59 AM
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Originally Posted by 1957 belair View Post
I am trying to build a 1960s gasser with it and the reason for the 283 is I wanted to use what was more of a easy to find motor for them that's also why I have a old 60s tunnel ram
Then just build it. Use Edelbrock 500cfm carbs on the T ram.
Get a Comp 280H magnum cam. 4.56 gears , 4 speed or a auto with a 9" 10" 3500++ stall.
It will run around very well on the street.
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Old 04-24-2013, 07:55 PM
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If money is not the object and high RPMs are the object,then build a 325 and make north of 500 hp@7,500. the 400 block breathes a lot better than a 283 block,with the same heads.I've been considering this engine for a long time now.I think I would rather have a 393 making north of 600 hp
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  #21 (permalink)  
Old 04-25-2013, 06:36 AM
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Tunnel rams are made for three things.Idle,high rpm's output(hp),W.O.T.And it is more W.O.T. than anything.The idea that it performs at part throttle well for cruising without consequences is pure B.S.Toilet bowl carb's systems can't provide that kind of controlled fuel curve.

What gets me the most is guys who "try" to come up with a "Like Mike" look from race cars when those parts are solely for race car r.m.p.'s.It's "Tech Not" thinking.Ignoring way too many factors.Decorating a project car vs applied tech to make it run as it should.Trailer queens.The 57 race car of that era is and was far removed from this kind of thing.Almost as bad as the undermining of performance industry as the poser cams companies offer.
I have said already it's your car to do with whatever you want.The guys I most respect are the mystic of sleeper's that when you look at it,it shouldn't run as it does,but does.

BTW-have you ever heard of the 57's "Black Widow"??. I am certainly not a purest when it comes to classic cars.Hell I would be one of the first to think about a BBC in one.But none the less here is a link for other options like the dual quad version 283 for super stock in the engine section of this site.Factory hot rods where cool back in that day because they where a no hold's barred version that ran pretty well for what they where.

1957 Classic Chevrolet- 283 Super Turbo-Fire V8 - Blue Flame Six

http://www.57classicchevy.com/1957-c...ack-widow.html

Last edited by 1Gary; 04-25-2013 at 06:41 AM.
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  #22 (permalink)  
Old 04-25-2013, 06:48 AM
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Now let's hold off on the posts of "I've had a tunnel ram on my car for 100 yrs and never had a problem with mine"......................

Fact is I ran a 57 in Modified Production yrs ago with a tunnel ram.Thing is that was still when 57's wasn't that hard to get and that car was towed to the track and back.
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  #23 (permalink)  
Old 04-26-2013, 02:40 PM
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Originally Posted by ap72 View Post
A 283 can move as much air as a 383 at the same RPM if the 383 is not designed for that rpm and the 283 is.
i don't build engines but i do know math
283 ci is 100 ci smaller than a 383 ci
at 5000 rpm the 283 will move 250,000 cubic inches per minute less than the 383
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  #24 (permalink)  
Old 04-27-2013, 04:25 PM
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Originally Posted by ogre View Post
i don't build engines but i do know math
283 ci is 100 ci smaller than a 383 ci
at 5000 rpm the 283 will move 250,000 cubic inches per minute less than the 383
Actually, I suspect ap72 was trying to make the point the VE matters, not just displacement and RPM, so yes, if you build the world's crappiest, most mis-matched 383, it will flow as little as a 283 at the same RPM.
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  #25 (permalink)  
Old 04-27-2013, 04:56 PM
How fast is fast enough?
 
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Originally Posted by ogre View Post
i don't build engines but i do know math
283 ci is 100 ci smaller than a 383 ci
at 5000 rpm the 283 will move 250,000 cubic inches per minute less than the 383
Your math assumes a hell of a lot, most of which probably isn't true.
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