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1971 chevy 250c.i. 6 cylinder engine rebuild help

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caleb in pa

03-05-2008 12:47:57

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I am 15 and I own a chevy 250 6 cylinder. I pulled it out of my car and will not use it. It was just running about a month ago. I want to get it runnig again. I plan on taking the heads off and cleaning them up. I want to take the pistons out and clean and put new rings on and hone the cylinder walls. Now here is my problem- my buddy says i can do what i want but when i put it back together again its gonna make a loud bang and not run. What could he mean????? thanks, Caleb

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B-maniac

03-06-2008 19:07:40

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

If it ran a month ago then why don't it run now? Or does it? How did it run when it did? How do you know it needs rings? What do you expect to gain by cleaning the "heads" up??? Sounds to me like you would just love to do your first engine overhaul just to prove you can do it and learn something along the way. Great!! Did the same thing when I was 15 only on a lawn mower engine,then motorcycle and then cars after that. Best advice I can give you is to FIRST learn the basic theory of operation of the 4 stroke cycle engine and then a "how-to" manual on gas engine re-building. Don't turn a bolt until you have done this. There is a right way and a LOT of WRONG ways to tear down an engine for re-build. DO NOT just tear it apart and throw everything in a box. If you READ first you will know why. YOU can either prove your buddy wrong OR you can prove him right. Get educated FIRST and he will be wrong! Before you touch it you need to perform a compression test AND a leak-down test. These will tell you what the engine "needs" , if anything. The "book" will tell you what these are and how to do them and what they will tell you . Good luck on your adventure!

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buickanddeere

03-05-2008 20:52:31

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Don't waste you $$$ spreading it over both the Nova and this stovebolt six project. If memory serves correctly. GM used the straight six until 1984? >Link

I>Link seen a pulling tractor one time with a turbo stovebolt six on methanol. Beat the daylights out of the natural aspirated V8's in the same weight class.

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ericlb

03-05-2008 19:29:09

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

go for it caleb, there easy to work on, just go and buy a manuel for it so you have all the specs and torque values and details, it would be fun to hook up with jose below and build that 6 up, put it back in the car and blow your friends doors off with it, trust me he'll never forget that, i did that 20 years ago to one of my friends in my '38 chevy sedan, i got a friend in the salvage business to sell me the engine out of a wrecked 71 corvette, dropped it in my chevy and my buddy had a hot pickup he wanted to race me with, i took him up on it and beat him badly, i..uhh, forgot to mention the vette engine to him before the race i still hear about that from him,

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ericlb

03-05-2008 19:37:35

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to ericlb, 03-05-2008 19:29:09

i was going to add that i rebuilt the 235 6 cylinder engine myself in a '62 chevy pickup that i had back in about 1980, that truck is still running! even though i sold it many years ago, the 250 is a improved engine from that one and will run a very long time with reasonable care,

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landlord7012

03-05-2008 18:35:25

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Boy that makes me think about the '72 Chevy 3/4 ton I bought in '87 (and to think I thought it was OLD but it was only 15!). Straight six 250 with a 4 speed that had granny low and 4:10 gears. What a stump puller, I could climb a 35 degree grade idling. I never thought twice about loading up 2 sleds on a trailer and pulling it up into Michigan around the top of the lake (yeah, it was screamin'!). Boy I miss that thing. It ended with 175,000 original miles on it because my nephew had to have a V-8 and automatic in it.

Caleb, your "buddy" is vicious and probably envious you have the nutz to work on what must appear to him to be junk. Go for it, maybe he'll appreciate it when you're done or maybe it's time for a new friend.

landlord7012

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jose bagge

03-05-2008 18:12:09

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

caleb:
I can give you a ton of 'el cheapo" hot rod info on these motors; I used to run them in oval track cars. A stock chevy 350 piston is a .125 overbore on this motor, which it will easily accomodate- if ya got a bore it, go the full .125 and use junk yard 350 flat tops. If you are able, find a 194 6 cyl head- smaller chambers, more compression. I'm gonna dig around and see if i can find you a cam- I should have some old race stuff here. all valve train stuff is same as V8, as is bellhousing, clutch, etc. Ton of fun to build- pull it apart! Lemme know if I can help with any info or parts- we no longer run these ( class went crate motor) and there are still a pile of hot rod parts out here for them. I've spun these engines to 7 grand reliably, they make fun "sleeper" motors for street cars on the sly.

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caleb in pa

03-05-2008 18:14:31

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to jose bagge, 03-05-2008 18:12:09

Sounds good.--Caleb

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MarkB_MI

03-05-2008 17:53:46

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Pay your buddy no attention. You gotta start somewhere. Just dig in and do it. And don't worry that maybe you'll make a mistake or two; that's how we learn.

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FixaLinc

03-05-2008 16:58:59

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Don't listen to him or doubt your mechanical ability. They were once used for circle track racers and also make great power units. You could always use it later on a log splitter, generator or such... Can put in a cheap kit or go all the way doing it right depending on what you want to use it for later. Pay attention to the timing gears wear and cam and cam bearing wear on a inline 6. Could be a cheap learning experience if nothing else.

engine kits

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37chief

03-05-2008 14:57:30

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

You have picked a good engine to work on. If you get a manual it will be a great hepl. Look on EBAY for parts. Stan

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El Toro

03-05-2008 13:57:19

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

You need to take a look at the bearings to see if they look ok when you pull the pistons. You may need to borrow a ridge reamer to cut that ridge at the top of the cylinders. You could damage the pistons by forcing them out. Use plenty of engine oil on the pistons and cylinders during assembly. Coat the bearings and rod journals too.

Be sure to clean those ring grooves on the pistons
before installing new rings.

Buy a cheap paint brush from the Dollar store for coating the parts with engine oil. Hal
PS: If the distributor is still on the engine its probably still in time.

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Michael Soldan

03-05-2008 13:44:51

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Well, often if you just rebuild the top end..valves rings etc you will blow out the bottom end if they are worn and not in good shape, I did re ring a old Ford truck once and did the valves and head..took it real easy for many thousands of miles and it worked out OK but it is more usual to blow out the bottom end than not under the circumstances described

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Fawteen

03-05-2008 13:30:32

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

I would imagine he's trying to say he doesn't think you can do it.

Personally, I'd say go for it. Tearing it down and putting it back together will be well worth the experience even if you don't get it running or actually use it.

I wouldn't put a heck of a lot of money in it under those circumstances. Take it apart, look it over good, think about whether or not you're likely to put it to good use in the future, and then decide whether to spend some money on it. Those little 250's are about as bullet-proof an engine as GM ever built. Even if you just put fresh gaskets in it and bolt it back together it should at least run.

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jdemaris

03-05-2008 13:27:23

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Hey, if your six has "heads", as in two heads - you've got a real collectors item.

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caleb in pa

03-05-2008 14:20:28

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to jdemaris, 03-05-2008 13:27:23

yea im used to writing about v-8's, got myself into a pattern of saying heads. - Caleb

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flashback

03-05-2008 14:51:14

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 14:20:28

As said before, that is one heck of an engine. You can almost run them dry, immerse them in water etc and it will still percolate. Just dont be sloppy and you will have one of the revving motors of the times. Bottom end torque is outstanding. We used them for drag racing in the 60's Jack

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VADAVE

03-05-2008 15:37:04

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to flashback, 03-05-2008 14:51:14

Yup people don't give sixes, or any straight engine, just credit.
Remember Deusenburg made a straight 8 that would do 100 in second haulin' a heavy car.

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TXFarmallFan

03-05-2008 13:17:40

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

If you arent planning on using it, why bother with the rebuild?

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chevdud97

03-05-2008 13:14:48

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Re: 1971 chevy 250c.i. 6 cylinder engine rebuild help in reply to caleb in pa, 03-05-2008 12:47:57

Possibly you dont know what your doing and your going to hurt yourself and the motor.

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