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Old 12-26-2005, 12:28 PM
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283 Question(s)

Recently purchase a car with a 283 Chevy from a 66 pass car.

The thing has lousy low-end torque and I am not sure where the problem is....but maybe you guys can tell me...?

It's a standard 283 block with the original flat top pistons. He added an Edelbrock Performance-Plus cam - 050 inch lift, 214 intake duration, 214 exhaust duration, (advertised 278 Intake/288 Exhaust) 112 degree lobe seperation. Edelbrock aluminum heads with 70cc combustion chamber volume, 2.02 Intake valves, 1.6 exhaust valves, roller rockers. Also an Edelbrock RPM manifold and 4bbl carb.

I am thinking that the static compression is too low? Do you think that a head change would be the easiest to fix this problem?

Thanks

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Old 12-26-2005, 12:53 PM
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A compression check would be the next step IMHO.

Stock distributor? If so, replace it with a rebuilt one or updrade it. Every old car I ever bought the first thing replaced was the distributor. They wear out and throw the timing around at any kind of RPM and rob you of power.
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Old 12-26-2005, 01:00 PM
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Lack of low end can be caused by several problems. Whats the rear gear ratio? what transmission? what size carb?
The 283 was a good high winder engine, but with a 3 inch stroke low end power wasn`t great to start with. The cam should have 204 214 duration and is a low end power cam, but what has me curious is the runner size of the heads, if the runner size is too big it kills velocity and the engine will be a dog on the low end but it should scream on the high end. The compression ratio will be on the low side with 70cc chambers, this can also cause lack of low end.
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Old 12-26-2005, 01:09 PM
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As a moderator here, I would like to WELCOME YOU .. here..

283's are good engines but suffer from lack of low end torque. Well not really...it just seems that way. They were great in the 50's and 60's .....until larger engines came out and we all got used to more torque

With 70 CC heads........your compression has to be way low...IMHO.

Again ......Welcome here..

DEUCE...
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Old 12-26-2005, 01:16 PM
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DV, if they're Performer heads I believe they are somewhere around 170 cc.
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Old 12-26-2005, 01:54 PM
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Yes sorry, here's some more info.

This is a 64 vette and the distributor is new along with an MSD ignition. The heads are 170cc on the intake side, 60cc on the exhaust side. Exhaust uses rams horns to side pipes. I am just looking for some punch off the line but I am thinking that 70cc head volume is too much thus dropping my static compression down too low???

it's a 4 speed with posi and I think the carb is a 500-600 cfm Edelbrock but I'd have to check the part #'s to know for sure.....
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Old 12-26-2005, 02:21 PM
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The 283s came with something like 58cc heads. With flattop pistons, you're way too low.
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Old 12-26-2005, 02:53 PM
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With a 7cc dish piston and a 70cc chamber you're probably at 7.7:1 compression, the big valves don't work well with the small bore 283's, the 170cc runners are too large, the RPM manifold was designed to work on a 350" motor, and if the carb is larger than 500 cfm it's not helping either.
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Old 12-26-2005, 02:59 PM
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you would be better off with smaller chamber heads like the old double hump heads
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Old 12-26-2005, 03:07 PM
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You've got a lot of quality parts there. Why not rebbuild a 350 and drop it in?
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Old 12-26-2005, 03:19 PM
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i would find a 64 year 327 and put in it, by the way, i wish i had that car

Last edited by steve t; 12-26-2005 at 03:25 PM.
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Old 12-26-2005, 05:24 PM
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Thanks for all the info guys.... I bought the car and apparently a few owners ago they replaced the 327 with a 66 passenger car 283. They guy I purchased it from had added all the new stuff - which apparently he didn't know what he was doing....The engine looks real pretty (all polished or chrome) but like I said "there ain't much there". I am considering a 327 or 350 crate but I talked to a guy who used to drag 283 chevy's and he said they were quick off the line...so I knew I had a problem... I have a 350 TPI in my other car which has some neck snappin torque so I wasn't sure if it was the smaller engine or the "add-ons" that the previous owner put on....

Thanks again for the input....
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Old 12-26-2005, 05:25 PM
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Quote:
Originally Posted by Tominator
You've got a lot of quality parts there. Why not rebbuild a 350 and drop it in?
Am I right in assuming most of this stuff will bolt right on to a 350???
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Old 12-26-2005, 06:20 PM
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All the parts will fit, but I'm a Ford guy that hasn't messed with a SBC in years so do some research and ask the questions before spending your money.
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Old 12-26-2005, 07:08 PM
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Everything on the 283 will bolt onto an early (2 piece rear main seal type) 350. One minor difference to consider is that the 283 has a road draft tube coming off the rear, top of the block next to the distributor, and the 350 must be vented in some other way, like though the valve covers.
.
On the original question, a 283 will never be a torque monster. With a mild cam, a heavy flywheel and some higher compression heads, and some low rear end gears, you can get it to launch pretty well, but you'll suffer on the top end.
.
The '66 283 used heads with 60CC combustion chambers which gave about 9.5:1 compression ratio. With 70CC combustion chambers, I figure you've got about 8.4:1 compression ratio. If you replaced the heads with 64CC heads you'll have about 9:1. If you went to 58CC heads (like 305 heads) you'll have about 9.7:1.
.
I love 283's and have seen some that really ran well, but a '64 Corvette deserves better. 350's are a dime a dozen and you've got a lot of good stuff to put on one. I think you should dump the 283 for a 350.
.
Just my opinion,
JA
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