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#1 |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Newby Overhauling a 283
I'm a new one to the forum and to the world of classic pick-ups. Last year I bought a 1967 C10 with a 283 and 4 speed on the floor.
When I bought it the engine knocked pretty hard. I quickly put an HEI on it and intended to start a rebuild on the motor soon after. However, life got in the way and I'm just now getting to it. My goal is to get my '67 in a condition where I can roll down the highway at a comfortable speed. I have a mechanic friend who told me the knock was a piston knock. He's itching to get inside my hood and do it all on his own, but I told him he can work on my wife's car, but this baby was mine. I have some experience working on motors, but not just a whole lot, so I need some help from you pros out there. What causes the piston knock and what will I need to look for to fix this? Also, what recommendations do you have to help me get this beauty running like she deserves? |
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#2 |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
One more thing:
When I bought the pickup, it was hard to start. The easy fix was attaching the choke cable, and she fired up like a beauty. However, she's gotten to where she won't even start when the choke is being used. I have to get my wife to spray a bit of ether in the carb while I'm cranking it. Is this caused by low compression, or what? |
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#3 |
Registered User
Join Date: Dec 2011
Location: Hammond,La
Posts: 23
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Re: Newby Overhauling a 283
Don't know about the knock,it could be anything from piston slap tp a loose flywheel bolt. The hard start well if it was me,maybe do a compression check. You can go online and find the values you would be looking for. I don't know if you intend to keep the truck exactly original or what but, you may want to consider a crate engine. By the time you pull the old 283 out and get all your parts for the rebuild,machine shop costs etc you could get a new or freshly reconditioned small block that will make going thru the gears a lot more interesting but,that's just me. Good luck
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#4 |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
What causes a piston slap?
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#5 |
Registered User
Join Date: Dec 2011
Location: winnipeg
Posts: 1,107
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Re: Newby Overhauling a 283
Piston slap is usually caused by excessive clearance in the bore or possibly a collapsing piston skirt. You can try to narrow it down by running the engine and disconnecting one plug at a time and see if the knock goes away,the cyl that silences the noise some is most likely your bad piston or rod or main bearing. If the noise is still there after that test it could be something else in the power train making noise,good luck.
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#6 |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
The knock only appears when I start it up and when the motor is at high RPM's. Other than that, it's almost not even there.
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#7 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Newby Overhauling a 283
pistion slap is caused but wear int eh cylinders. i ahd a 327 that knocked on start up and the high rpms, only way to fix it is a compete tear down and rebuild, i'd get the numbers off the rear of the engine block to verify that you do indeed have a 283 DO THIS BEFORE ordering any parts for the engine, Then its all about dissembling the motor and having the cylinders bored and honed new freeze plugs cam bearings , heads reworked, havignt eh crank checked out at the machince shop so you can get mtching bearings for it. good place to get rebuild kits are http://www.northernautoparts.com/.
i rebuilt a 305 for my truck i had over 600 dollars in parts (rebuild kit, rods rockers vavles vavle guides, a new crank) ect..) i did all the machine work at school with teacher supervision, but if i had to pay for all that machine work i'd been at close to 1500 dollars, and you can get a gm 350 290hp turn key for 1900, all on what you want to do
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#8 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Newby Overhauling a 283
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... Last edited by crazy longhorn; 01-07-2012 at 11:35 PM. Reason: spelling |
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#9 |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Newby Overhauling a 283
Iron hoarder. You sound like me with Pontiac stuff crazyL. You have a sj 350 in the collection too?
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1969 c-10 Step Side Long Bed. I-6 250cid = ![]() |
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#10 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Newby Overhauling a 283
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#11 | |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,333
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Re: Newby Overhauling a 283
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If it doesn't make noise (what ever it is) under a load, it's not a good sign. A good friend of mine had a 307 w/ a knock like yours, drove it for quite a while, like that. One day the knock got louder in a hurry, it made a BIG knock when the connecting rod punched a hole in the side of the block... ![]() The 520 heads are what I used on my 283 when I had it rebuilt (they were the stock heads, also) I thought of using larger valve heads (which also have larger ports). That would have been a mistake, the 520 heads are perfect for a 283, on the streeet. I had a 67 Bel Air w/ a 283 in it, could barely keep it from clattering (original condition). When I tore it down, it had lead desposits in the chambers and on pistons. I had the engine built by a REAL engine builder, I did a lot of work on the heads, one of the things I did was smooth all the sharp edges in the chambers and piston tops. I've put 160,000 miles on it since, never had it ping, ever. |
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#12 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,333
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Re: Newby Overhauling a 283
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#13 |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Newby Overhauling a 283
Olds ... my second love after Pontiac. Any Rocket 455's?
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1969 c-10 Step Side Long Bed. I-6 250cid = ![]() Last edited by GRX; 01-08-2012 at 10:10 PM. |
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#14 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Newby Overhauling a 283
As already said, there are a few things that can be misdiagnosed as a knock. A common mistake is an exhaust leak at the manifold. Often those go away when the engine warms up. I can tell the difference in 2 seconds, but a newbie might not. It's hard to diagnose noises over the internet for people. LOL. Best bet is to take it to mechanic that you trust and get their opinion. Also, do a search on YouTube for "rod knock" and you will see procedures for dropping the oil pan and wiggling each rod with your hand. The bad one will have play where the rest will not. If that's the case, major work is ahead.
By the way, I'm digging the original white bumper. Nice.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... Last edited by storm9c1; 01-08-2012 at 11:23 PM. |
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#15 | |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
Thanks for all the information. I've taken it to a mechanic who confirmed that it was a piston knock, and not a rod knock or exhaust manifold leak. He warned me about it going south real quick and throwing a rod through the block like 68Gold/White mentioned.
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I like the idea of keeping a 283 in her and not going for the crate motor swap. Just seems like she was made for this. I want to get this motor in working condition where I can drive safely without worrying about any malfunctions. The guy I bought it from threw in an extra 283 block that I plan on pouring some money into over time. As soon as it warms up a little bit I plan on doing a complete rebuild. I'll let yall know what I find out. |
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#16 |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Here, these pages should help. What you are looking for is the casting number on the back of the block.
Where to find the numbers: http://imageshack.us/photo/my-images...01eu3.jpg/sr=1 What they mean: http://www.nastyz28.com/sbchevy/sblock.php Keep in mind, the casting number and block date code are raised since they were part of the mold. The engine ID on the front pad are stamped. |
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#17 | ||
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
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#18 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Newby Overhauling a 283
That's even more betterer. The 283 is a *****in' motor... But the 327 is even more *****in'.
![]() Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#19 | |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Newby Overhauling a 283
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1969 c-10 Step Side Long Bed. I-6 250cid = ![]() |
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#20 | |
Registered User
Join Date: Dec 2011
Location: Wyoming
Posts: 33
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Re: Newby Overhauling a 283
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![]() So now I need some major help. I'm kind of wet behind the ears when it comes to motors. I have some experience, but probably not near as much as all of yall do. I want to mildly modify this 327. Not something that is going to cost me thousands and thousands, but I have a little bit put back that would allow me to have some fun with it. What do yall recommend as far as: Carburetor Intake manifold Camshaft Heads And anything else I don't know to ask about I know I have to make sure I don't have a cam that is too big for my heads and stuff like that, but I don't know exactly what to compare when looking at that. I bought a book on Amazon ( ![]() |
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#21 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Newby Overhauling a 283
Carb: Holley 1850 (600cfm)
Intake: Performer RPM Cam: Comp Cams XE268, or Lunati Voodoo 60101 Heads: GM Vortec Ignition: A quality built HEI (skip the junk made in china) Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#22 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Newby Overhauling a 283
I think before we can make good recommendations, we need to know exactly how your 327 is equipped now. If you can get the suffix cods off of the block on the passenger side just in front of the head, that will tell us a lot.
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#23 |
Registered User
Join Date: Jan 2012
Location: Chula Vista, CA
Posts: 109
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Re: Newby Overhauling a 283
Welcome to the forum. Keep us posted. I have similar situation with my 65 283, Only mine runs good just smokes.
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Why can't I find it until the last place looked? 65 Longbed 283 three on the tree. 66 Longbed 292 three on the tree.Pennys A/C Trucks made in USA Buy a much as you can, Made in the USA |
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#24 | |
Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Newby Overhauling a 283
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The book link didn't work. You might try an Amazon search on these: "Chevrolet High Performance Tips and Techniques" This one is not Chevy specific, but has loads of great info. Hard to find a better builder than Smokey Yunick. "Smokey Yunick's Power Secrets"
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1969 c-10 Step Side Long Bed. I-6 250cid = ![]() |
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#25 | |||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Newby Overhauling a 283
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![]() Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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