350 has no power

30

Asked by Aug 23, 2016 at 02:42 PM about the 1974 Chevrolet C/K 20

Question type: Maintenance & Repair

I have a 1974 chevy c20 with a 350. The
truck starts great, revs great, even goes
down the road great with no miss. Problem
is its got no power, even going up a
moderate hill you have to floor it and still
loose speed. Its got new plugs, new plug
wires, a new hei distributor. What can cause
the lack of power?

8 Answers

66,635

Lack of power may be low compression on engine,do a compression check on it,all so check the timing.

1 of 1 people found this helpful.
68,695

If it's running hot and the transmission (automatic) is shifting late as well it's a worn timing chain. HTH. -Jim

30

It dont run hot at all and shifts good. Could it be my carb?

1 of 1 people found this helpful.
68,695

Check the ignition timing and run a compression test as TST said. If the ignition timing is retarded (late) that'll cause a loss of power. Poor compression will too. Is this a higher mileage vehicle? HTH. -Jim

30

Its got 150,000 on it. Dont believe the motor has ever been broke into.

1 of 1 people found this helpful.
68,695

Ok, it is possible that the timing chain needs to be done. Back in those days GM was using a plastic camshaft sprocket which tended to fail. I had to do the one on my '70 Catalina at 168,000 miles. But do the other tests first. HTH. - Jim

30

Ok thanks

1 of 1 people found this helpful.
68,695

You're welcome. Glad to help. -Jim

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