Weird engine noise...

[rich weyand]

On a new engine, you should change oil at 100, 500, and 3,000 miles, then 3,000 thereafter.

So don't forget that 500 mile oil change.

[LTZ C20]

What Rich said.

[roger97338]

Sounds like header slap from a set of Hooker headers to me.  Mine does the same thing.

What's 'header slap?'

[Irish_Alley]

Sounds like header slap from a set of Hooker headers to me.  Mine does the same thing.

What's 'header slap?'

[roger97338]

Sounds like header slap from a set of Hooker headers to me.  Mine does the same thing.

What's 'header slap?'

[rich weyand]

Exhaust pulses from the engine hit the thin walls of the header tubes where they bend, and make a metallic ticking sound.  Sounds like a bad lifter or an exhaust leak.  You can tell if that's what it is by pushing on each header tube at the corner and seeing if that changes the sound, although sometimes you only get the sound when you have your foot in it.  The Hooker 2453 headers (for the K trucks) in particular, slap on #3 and #4, which bend sharply back coming out of the engine.  Those bends are 90s, where the down bends of the other tubes on a V8 are 45s.

[roger97338]

Exhaust pulses from the engine hit the thin walls of the header tubes where they bend, and make a metallic ticking sound.  Sounds like a bad lifter or an exhaust leak.  You can tell if that's what it is by pushing on each header tube at the corner and seeing if that changes the sound, although sometimes you only get the sound when you have your foot in it.  The Hooker 2453 headers (for the K trucks) in particular, slap on #3 and #4, which bend sharply back coming out of the engine.  Those bends are 90s, where the down bends of the other tubes on a V8 are 45s.

I liked your previous explanation better. I giggled for a long time at it!

[LTZ C20]

Haha you guys are ridiculous. That made me lol.

[Silver_Bullet85]

It's crazy how time flies by sometimes, just figured I'd check back in and update y'all as to what I learned. I remembered when installing the engine that the indicator for TDC was a little bent and so I started playing with it and learned (by trial and error) that I was a few degrees off of where I should be. So now I'm at (according to the bent indicator) 18 degrees initial and 39 total mechanical advance. This has pretty much eliminated the noise and the engine runs a lot better too, now I just need to dial in my mixture screws and idle speed a little more to get everything back to how I like it. Thanks for the help everyone!


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[LTZ C20]

Good to hear.

[Ds2014]

What about detonation what's your cranking compression turn the timing back and try it

[rich weyand]

He shouldn't start to see detonation on 87 octane and 8.5:1 until 20* BTDC, unless the plugs are fouling.