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10-14-2015, 07:16 PM
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#1 |
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Registered User
Join Date: Dec 2013
Location: Oak Ridge, Mo.
Posts: 301
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A few 250 questions
Finally started working on my in liner, clean-up, paint re-gasket, etc... It has electronic sparky, weber carb, stock intake and exhaust manifolds. It has been sitting in my shop a little over a year. I haven't checked compression, but motor feels good turning it over, seat of the pants feel.
I pulled the plugs, the center 2 look good. Outside 2 on each end had a little oil around the threads, I figured valve seals leaked down some, and also looked like it may have been running a little rich. Friend of mine has a cam that he bought for a square body back in the 80's (he told me the lift on it, but it slips my mind ) I could probably get for free, it has never been used. I picked up this motor from a guy here on the boards, I don't know much history on it, but I heard it run in a video. Should I: A) leave it alone and run it stock. B) install cam and see what it does. C) install cam, headers. Will I have enough carb for that ? I don't want to open a bucket of worms, I want it to be reliable.
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If you don't like this  pound sand .....
Last edited by T and S; 10-14-2015 at 07:19 PM. Reason: add info |
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10-14-2015, 07:28 PM
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#2 |
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Moderator
 Join Date: Dec 2012
Location: ON, Canada
Posts: 2,176
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Re: A few 250 questions
Keep it stock. Get it running well, tuned properly, leak free.
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10-14-2015, 09:10 PM
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#3 |
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Registered User
Join Date: Dec 2013
Location: Oak Ridge, Mo.
Posts: 301
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Re: A few 250 questions
That's what I am leaning toward, I just thought I would get some opinions from different peeps.
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If you don't like this pound sand .....
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10-14-2015, 09:17 PM
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#4 |
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Registered User
 
Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: A few 250 questions
A cam with a little more lift and duration won't hurt anything. Long as the lift is no more than .450. But if it runs ok, compression is good and even, doesn't smoke, I'd tune it up and enjoy it. Run some good oil in it since its an older engine.
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1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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10-14-2015, 09:22 PM
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#5 |
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Registered User
Join Date: May 2014
Location: SAN FRANCISCO
Posts: 447
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Re: A few 250 questions
If you decide to run the cam make sure it's been stored properly (on end) or just make sure it's straight. Was just reading how they can bend under their own weight if stored flat...
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'66 C10 SWB '64 C2 roadster '38 Indian Scout Flattracker '70 Triumph T120R '81 Laverda Jota |
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10-15-2015, 07:13 PM
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#6 |
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Registered User
Join Date: Dec 2013
Location: Oak Ridge, Mo.
Posts: 301
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Re: A few 250 questions
I think he told me the lift was .520 or something like that. I didn't realize cams would bend from storage.
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If you don't like this pound sand .....
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10-17-2015, 10:37 AM
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#7 |
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Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: A few 250 questions
Agree with others above. Get it running with no leaks and be happy. You can worry about performance parts later.
Stock was around .390. 520 lift at the valve is high for these 250s. Pretty much race applications. For that you would definitely need new springs. And probably need the valve guide tops milled down so the valve spring retainers don't cut the umbrella seals. And do not forget new lifters for the new cam. Cams and cranks can and do bend if not stored properly. |
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