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Old 01-12-2013, 09:01 PM
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283 engine

Building a 1962 chev ss impala convertible, Currently has original 283 bored 040 with 461 fuelie heads, and power glide, Thinking i want more hp. Do i dump the 283 and go 350?? Wanting a stock look with a drop and some wheels, Also thinking 4-speed, is this 283 gonna be hot roddy enough? Not wanting a drag car but a little hot rod, I havent heard this run its been sitting a while and i just tore eng, doen to see what the bore was,
Any advice Thanks

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Old 01-12-2013, 09:26 PM
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I love the 283.Not a big horse power producer.It depends what you want though.For me and a nostalic Impala,I would use a saginaw 3 speed floor shift and a 260 horse 283. A 350 would out perform the 283 in every way and be cheaper.A 283 can make north of 360 horses but it would need some RRRRRs to make the power and torque would be nothing special
what do you want in your car? we will help with ideas
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Old 01-12-2013, 09:41 PM
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283 engine

Thanks for reply, Not sure what im wanting, Do want the muncie 4-speed, The 283 is there and bored 040, ,cylinder walls are spotless, have the fuelie 461 heads,, iguess what im asking is this 283 gonna have any ump to it?? If i kept what cam would work?
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Old 01-12-2013, 09:45 PM
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You cam make over 400 hp from a 283. Do you want a radical,cantankerous,not so street friendly engine with rough idle,that performs like a daily driver 350/383? Do you like a 250/275 horse fun to drive,zippy 283 that sounds a lot tougher than it is? A 220 horse 283 that purrs,gets decent mileage and looks era correct?
or that 350/383 mentioned above?
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Old 01-12-2013, 10:01 PM
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283 engine

Well im leaning toward keeping the 283, The zippy fun to drive 250hp-270hp. would maybe suit, Not wanting a 383, Any ideas on the build for the 283 and what cam? Also are the 461 heads ok ? Or do you go ?? thanks in advance for your help
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Old 01-12-2013, 11:11 PM
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461s on a 283 would be fine.make sure the chambers are 64cc. A little porting would not hurt.(little) nothing to not much on the intake side,leaning towards nothing.
What type of camshaft do you like using? what type of drive are you,generally speaking.

Quick recipe with out YET matching the parts,just a general recipe to start talking about,,,,
I would recommend or use,,, a 650 holley double pumper,or something similar size that you prefer(IE 650 edelbrock), performer intake, camshaft would be something like
110991-08 CL110991-08 275 275 221 221 .470 .470 108 104 Hyd. Hyd. 1
1700-5700 Good low & mid-range horsepower. Needs 4 barrel & headers.
this cam would let a 283 rev to 6400
9.2 ish:1 compression ratio,1 5/8 headers,roller rockers,1 5/8 long tube headers.
I would really like to see some improvements in rear gear ratio maybe 3.90 and a posi. a 4 speed with the lower 2.54 first gear.
lets start talking from here
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Old 01-12-2013, 11:19 PM
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speeds in gears at 6400 rpm=// 1=53 mph,,2=71 mph,,3=92 mph and 4th=134 mph

standard shift speeds @ 3000 rpm,, 1=25 mph,,2= mph 33,,3=43 mph,,4th = 63 mph

using a tire 27.5 inches tall IE: 225/70/15
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Old 01-13-2013, 04:44 AM
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There's no replacement for displacment.
Do a 350 !
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Old 01-13-2013, 05:47 AM
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I put a 350 in my 62 with all the 283 accessories....You cant tell that it isnt a 283
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Old 01-13-2013, 08:30 AM
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283 chevy engine

It would be mostly city driving, As far as cams, Not sure of brands, What about the comp thumper cams, Should i go roller????
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Old 01-13-2013, 09:04 AM
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283 rebuilt with a true 10:1cr using the 461 heads Get the compression ratio right. (can be ported for more effect)
EG:
hyd roller cam 208 to 218@.050" (The GM ZZ4 crate motor cam would be a good choice)
208-221@.050" .474-.510" 112LSA. ( can use a 1.6 intake rocker to effect if the heads are ported)
will need some retro fit valvetrain parts like the lifters, valve springs springs etc.

Performer RPM intake- headers dual exhaust 650-750cfm carb
recurved distributor.
Replace the power glide 2speed transmission with a th350 3 speed auto and get a 10" "3500 stall" converter.
No, this is not too much.
The real stall speed will be about 2800-2900 rpm, behind a 283.
Replace the axle ratio with a 3.73-4.10 ratio and a eatons replacement posi.

You will have a very good running Impala, using the 283.
if you don't want osue a hyd roller then keep the hyd flat tappet cam in the same .050" duration group.
The lil 283 will want to rev. Don;t wimp out on the trans swap and critical converter and rear gear selection.
Getting these factors as will as the engine compression ratio correct is critical.
The 461 heads need some work to wake them up. Stay with a 1.94" intake valve thou.

Last edited by F-BIRD'88; 01-13-2013 at 09:09 AM.
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Old 01-13-2013, 09:58 AM
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Not here to argue with Fbird,but I disagree with using a short duration high lift cam and a lot of porting on the GM 461s. You do not need that much head flow and you do not want to open the intake runners. The 461s will flow 200 plus CFM on the intake side {plenty for a 283).I would use a lower lift cam,again,its a small engine does not need huge flow. I would use a little more duration( like I posted) to give the cylinders "time" to fill at higher RPMs. I would use a low intake center line cam,as most engine builders use in smaller engines.
porting the exhaust side is good in any GM head. If you decide on a roller cam(very good choice,but costs a little more) I would use similar specs,of course the lift will be slightly higher.
The 461s can be used with 2.02 valves.
If you decide at any time that you will rev the engine past 6500 rpm,then a rod upgrade is in order.

re disguising a 350 as a 283,,,not possible. You have to decide what engine and why you want it. A stockish 350/383 will get there and probably a lot quicker.
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Old 01-13-2013, 10:06 AM
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The 283 will respond to a nice port job on those heads just like any other SBC.
Get the heads up to around 235cfm from stock 197-200cfm and you will see a whole different motor.
Thats not a huge port. 170 ish finished port volume.
A huge difference. 283's need head flow too.
And most of the gains wil be at high valve lift, where a higher valve lift will pay off. .500" net lift
Keep the intake duration short for spunky street torque and acceleration.
The SBC ZZ4 crate motor cam with a 1.6 intake rocker arm is ideal for this ... 208-221@.050" 112LSA .505" in .510" ex.
Use the new beehive OEM GM LS6 springs with a comp 787-16 spring retainer 1.6-1.5 rocker set.

2.02 valves in this head require the chamber to be opened up. Definaly the wrong direction when trying to get compression on a 283.
stay with 1.94x 1.50 or 1.55" valve. Port the heads to wake up the head flow. Improved flow with plenty of port velocity.
Keep the chamber small.

Last edited by F-BIRD'88; 01-13-2013 at 10:18 AM.
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Old 01-13-2013, 10:48 AM
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I reiterate,not here to argue.
I would not open the intake side,for velocity in port.235 cfm will support up to 500 plus horse power,Im thinking 260 plus horse power.That is why I would not port the intake side .If there was a problem on the intake side I would fix it,nothing else. 2.02 valves fit on a 283. 461s can be finished at or close to 64CCs .porting exhaust side is self explanatory. 112 lda? please explain how that would work on a 6500 RPM 283?

If I was building a 420 horse power 283,I would use heads that flow 240 cfm and still use an intake center line at 102-105.If I use a carb bigger than a 4777 ( 650 double pumper)I would use a 4777 with a base plate off a 4781 (850 double pumper base plate) If you look at my ideas you will see that I mostly recommend items that are high velocity (moderate/small ports,carb with small venturi,moderate lift cam, 2.02 valve with small ports and lower lift) the flow numbers are plenty to support 300 HP. If you have a 283 engine that make 250 plus horse power at 6500 rpm,you also get extremely responsive throttle and the lower ICL makes for the punchie power band that makes a small engine fun to drive. The idle would be a little lumpy but not obnoxious like some of the silly 300 duration hydraulic flat tappet cams.
I admit that no engine combo is perfect,but if I can borrow from the master,Mr Tech,combination combination
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Old 01-13-2013, 11:31 AM
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Quote:
Originally Posted by vinniekq2 View Post
I reiterate,not here to argue.
I would not open the intake side,for velocity in port.235 cfm will support up to 500 plus horse power,Im thinking 260 plus horse power.That is why I would not port the intake side .If there was a problem on the intake side I would fix it,nothing else. 2.02 valves fit on a 283. 461s can be finished at or close to 64CCs .porting exhaust side is self explanatory. 112 lda? please explain how that would work on a 6500 RPM 283?

If I was building a 420 horse power 283,I would use heads that flow 240 cfm and still use an intake center line at 102-105.If I use a carb bigger than a 4777 ( 650 double pumper)I would use a 4777 with a base plate off a 4781 (850 double pumper base plate) If you look at my ideas you will see that I mostly recommend items that are high velocity (moderate/small ports,carb with small venturi,moderate lift cam, 2.02 valve with small ports and lower lift) the flow numbers are plenty to support 300 HP. If you have a 283 engine that make 250 plus horse power at 6500 rpm,you also get extremely responsive throttle and the lower ICL makes for the punchie power band that makes a small engine fun to drive. The idle would be a little lumpy but not obnoxious like some of the silly 300 duration hydraulic flat tappet cams.
I admit that no engine combo is perfect,but if I can borrow from the master,Mr Tech,combination combination
I can't really make much sense of all of that, I'm guessing other people can't either.
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