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Old 07-19-2010, 03:40 PM
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Chevy 307 Loss of Power

I have a 1970 Chevy C-10 with a 307, 3 on the tree, stock 2 bbl Rochester carb. I am experiencing an intermediate loss of power that seems to occur under a load at higher rpm (long hill, running at 65-70 mph), or when shifting into 2nd gear on an incline. Seems to only occur when the engine is hot, running for more than 30 minutes.

Carb was rebuilt about 3 years ago, points, plugs timing all seem fine. Only modification to the engine is a dual exhaust, but I left the stock manifolds on.

Any ideas?

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Old 07-19-2010, 04:27 PM
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maybe bit of vapor lock
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Old 07-19-2010, 04:32 PM
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How many miles you got on it? Still running the stock distributer i guess. Have you thought about a up-grade on the distributer?
You need to put a light on it and see where the timing is at. JMO
Also could be a week fuel-pump. I had one do the same thing on a hill or slight incline or under a load turned out to be the fuel-pump.





Cole
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Old 07-20-2010, 06:26 AM
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67k miles, still running stock distributor, timing is OK.

I replaced the fuel pump, probably 10 years/10K miles ago. Shouldn't they last longet than that?
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