67 c20 runs rough
July 15th, 2018, 7:11 AM
#11
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Verify that you do have the original carb. Over the years one of the previous owners may have changed it. Rochester 1 barrel carbs look the same from year to year but they do have difference on the inside.
July 15th, 2018, 9:34 AM
#12
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it’s original but, I’m worried about after market carb kits, I’ve had bad luck on those with ATVs and dirt bikes. Also how much will that motor be worth once running perfect again? I’m thinking about decommissioning the truck for a while and selling the motor to buy a 350 and then put that in. But I would like to know what the engine is worth. It burns no oil and has 55,000 miles on it.
July 15th, 2018, 11:12 AM
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It is worth whatever the person who needs it is willing to pay. Here is an example:
https://www.ebay.com/itm/CHEVROLET-1...25.m3641.l6368
https://www.ebay.com/itm/CHEVROLET-1...25.m3641.l6368
July 15th, 2018, 11:16 AM
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July 16th, 2018, 11:35 AM
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July 19th, 2018, 2:55 AM
#19
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The 350 didn't really replace the 327 to any large extent until 1970 or so. And dont put a post-1972 350 motor in your C-20. After that date, most car manufacturers dropped the compression ratio's on most engines to adapt to the new "smog" laws.
The horsepower reduction due to the low-compression engines was very noticable in 1973 to 1985 motors, back in the day.
You should have a 9.5 to 10 to 1 ratio compression engine. You could go higher then that, but if you do, you'll need to use plus or premium gasoline, unless you retard the ignition timing back, which will yield less HP and more fuel consumption.
Last edited by oilcanhenry; July 19th, 2018 at 3:34 AM.
