GM Truck Club Forum banner

79' Chevy Scotsdale 350

3381 Views 7 Replies 5 Participants Last post by  ChevyFan
I have a 79' chevy 1/2 ton 4x4 pick-up, I replaced many parts and upgraded parts like , carb,headers,intake,etc......My problem is ,I hear a spark knock at high speeds or climbing hills. How do i eliminate this noise. Is there something i overlooked in my upgrades, or is it just fine tuning the timing or ajusting the carb??????? I need help??????
1 - 8 of 8 Posts
RE: 79

How loud is the noise?
79' 350 chevy

the noise sounds like a bad gas sound , not very loud but very annoying,, i have headman headers and glass packs with staight pipes to get an idea, and i can hear it from inside the cab,,,,,,,
RE: 79

Is it an original 350 from 79 in your Scotsdale? If so, how many miles, etc?
RE: 79

Are you hearing the knock mostly under load? I agree, more information on the age/condition of your engine will give some clues.
You can back the timing off a little or try running a higher grade of gas. Either should help, but the gas is the easiest to start with.
Yes, it's always best to start simple. Keep the tank full, try a different brand with different additives and higher octane, etc.
any news?
1 - 8 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.