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Re: Adjusting valves on 283...again?? [Re: LGriffin] #565272 Sat Aug 15 2009 06:48 AM
Joined: Jun 2009
Posts: 333
A
Adam61 Offline OP
Shop Shark
LG, I've heard from several people that it's possible to change out the gearset in these rear ends without having to swap out the whole axle/rear end. Someone once told me (actually it was the previous owner) that the truck would work well with 3.73 gears. The yoke on the rear end (the part that connects to the shaft) is worn and vibrates a bit under higher speeds, so I think I may have this done pretty soon, to get the rpms down a little. The engine has to rev pretty high on highways....don't know how high...I dont have a tach, unfortunately.

Re: Adjusting valves on 283...again?? [Re: Adam61] #565330 Sat Aug 15 2009 02:56 PM
Joined: Nov 2002
Posts: 1,007
L
LGriffin Offline
Shop Shark
3.90 to 3.73 is not a significant change. I would suggest you find an RPM calculator on the internet and play with it. First you will need to know what tire size your going to be running. Then I'd find a rear axle ratio that would keep the RPM under 2500 and above 2000. I use 2.5k as the limit because that's about where the secondaries kick in on a Quadrajet, and gas mileage drops. Quadrajets are my preference for carbs. The 2k bottom is because the I think with the 283 you should be a little more into the torque curve than a larger sbc.

With the 4spd your options drop a bit for and OD. An OD would drop your rpm by 20-30%.

here's a link to the "Tech Tips" an a rpm calculator;

http://www.stovebolt.com/techtips/calculate_rpm_tire_axle.htm

LG

Last edited by LGriffin; Sat Aug 15 2009 03:02 PM.

I don't own a vehicle that isn't old enough to drink.
Re: Adjusting valves on 283...again?? [Re: LGriffin] #566621 Wed Aug 19 2009 03:00 PM
Joined: Apr 2005
Posts: 1,944
B
Builder Offline
Shop Shark
IMHO
Buying another engine vs rebuilding your 283 is a wash if you are building a stock engine. The costs of a different engine makes up the difference in the extra costs of rebuilding the 283.

Re: Adjusting valves on 283...again?? [Re: Builder] #567081 Thu Aug 20 2009 11:05 PM
Joined: Jun 2009
Posts: 333
A
Adam61 Offline OP
Shop Shark
So your suggestion is to rebuild the 283? That's what I want to do anyway. I was told that it is the original; engine, but don't really know how to verify that. There is no "V" in the hood where the emblem is, which makes me question the originality. But regardless, for some reason I like the 283 and would rather yank it out and rebuild it than put something else in there.

Re: Adjusting valves on 283...again?? [Re: Adam61] #567091 Thu Aug 20 2009 11:35 PM
Joined: Feb 2002
Posts: 12,860
F
Flxible Offline
Extreme Gabster
I'd rebuild it - in fact I've done so, more than once, they're the best V8 GM ever made - the 58 has a rebuilt 283, 060 over, runs like a stuck pig and if they're sound, they don't mind the revs at all, with the stock 3.90 rear I've cruised at 70 for extended periods [3000rpm?] .... bit noisey, but won't hurt the engine

you're right that no V means it was a 6 from the factory, but of course anyone could have chosen the V8 after the fact, being the optional engine - could have even happened at the dealer when the original owner wanted that truck 'right now' but with a V8 grin

the OD trans is a good option for lower revs on the open road, and might be easier to find - certainly easier to install than new gears and would drop the rpm from 3000 to about 2200, the 4 speed is only useful if you plan on crawling around the farm fields in the mud, otherwise it's a 3 speed with an xtra useless gear

Bill


"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics
Re: Adjusting valves on 283...again?? [Re: Adam61] #567141 Fri Aug 21 2009 01:22 AM
Joined: Aug 2004
Posts: 1,068
H
Hot Rod Dad Offline
Shop Shark
Without reading all the posts, I might be tempted to ask if the 283 has a solid cam. The other thing it could be is loose exhaust, which also gives a very similar tapping sound.

Re: Adjusting valves on 283...again?? [Re: LGriffin] #567153 Fri Aug 21 2009 01:55 AM
Joined: Nov 2004
Posts: 121
C
Crabbyappleton Offline
Wrench Fetcher
If your gauge is accurate, I think you are due to replace the bearings at a minimum. If you have 12# driving and it increases to 20# when you let up on it, your main bearings are loose. Those little Chevies very rarely give any crankshaft trouble, but anything is possible. You probably could get by with just new bearings. Of course, you won't know until you tear it down.

Also, on the loose nuts on the valve train, you can simply take the nut off and strike it with a hammer to make it tight again.

Re: Adjusting valves on 283...again?? [Re: Flxible] #567202 Fri Aug 21 2009 04:48 AM
Joined: Jun 2009
Posts: 333
A
Adam61 Offline OP
Shop Shark
A 3 speed with over drive is easy to find? Like a 3 in the tree? If that's so, I have the correct steering column, just have to hook it all back up ha ha

Re: Adjusting valves on 283...again?? [Re: Crabbyappleton] #567203 Fri Aug 21 2009 04:49 AM
Joined: Jun 2009
Posts: 333
A
Adam61 Offline OP
Shop Shark
Crabbyappleton, do you mean strike the nut itself with a hammer? What does that do, compress the threads just enough?

Re: Adjusting valves on 283...again?? [Re: Adam61] #567230 Fri Aug 21 2009 07:22 AM
Joined: Nov 2004
Posts: 121
C
Crabbyappleton Offline
Wrench Fetcher
Yes, it will compress the nut enough that the nut is tight again. I have done this in the past several times.

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