We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [ls1]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
4
votes
0answers
87 views

Light abrasion on the valve stems - is the outlook gloomy?

Background I'm rebuilding my LS1 Chevy. The cylinder heads came back from the machine shop fresh with a 5-angle valve job and mechanically-lapped valve faces and seats. What concerns me is the ...
3
votes
4answers
456 views

Lapping valves by hand - does the compound have to be cleaned off?

I'm hand-lapping valves on the LS1. This is probably a silly question, but I just wanted to confirm that I have to wipe off the lapping compound prior to the hydro test.
4
votes
1answer
86 views

Should I be concerned about eccentric valve rotation?

Yup, it's that infamous Exhaust Valve #3 again (that "6" is a misnomer). It's now back from the machine shop, with a freshly-cut valve face as part of a 5-angle valve job. Now that the valve and ...
6
votes
1answer
3k views

This valve is pitted - what options do I have?

This is that infamous Exhaust Valve #3 after cleanup. The cylinder had a history of fuel/spark-related misfires. As the images show, the lip of the valve is pitted. Here is the back of the valve. I ...
6
votes
1answer
769 views

Is this cylinder head junk?

There's a chunk of aluminum missing from the surface of my LS1 cylinder head. In the picture below it is located on the edge of the rusty looking cooling jacket port. Is this something to be ...
9
votes
1answer
1k views

Do I risk damaging the valve seat if I lap this valve without removing carbon build-up?

This valve is from my LS1 (Exhaust #3). It's suffered from a lot of carbon build-up due to a history of fueling/spark problems. I've tried cooking it in ethylene glycol. I've tried using abrasion ...
3
votes
2answers
2k views

Is ATF effective for cleaning carbonized heads and pistons?

LS1 teardown underway, and it's not looking pretty I know I can use carb cleaner, but was intrigued by a suggestion online to use automatic transmission fluid (ATF), especially since I have a ...
9
votes
1answer
653 views

Why is this valvetrain pitch-black?

I'm in the middle of an LS1 teardown. Last weekend I removed the valve covers to and found it hard to see anything, as the pictures below will evidence. While I wait for an opportunity to resume the ...
6
votes
1answer
552 views

LS1 - ticking slapping noise w video

So I'm trying to identify what may be the cause of this ticking noise. I listened to all the LS1 ticking and knocking videos on YouTube but none are similar to mine. It sort of sounds like when ...
6
votes
1answer
2k views

Is there any benefit in performing a 4/7 swap on an LS engine?

Based on some resources, I was able generate a list of all theoretical firing orders for an LS engine with a cross-plane crankshaft. Here they are (L,R denote which bank each cylinder in the firing ...
5
votes
2answers
12k views

Do I have a bad ignition coil? Measurements inside

I'm troubleshooting what I believe is an engine misfire on my LS1 Chevy and want to rule out if I have bad ignition coils. In order to do this I took out the ignition coils and measured the ...
3
votes
3answers
16k views

What are possible causes for belt tensioner “chatter” at idle?

Moving from one set of issues to another on my LS1 Chevy. With the gear in 'D', A/C on and the handbrake pulled, I popped the hood and noticed for the first time that the main belt tensioner is "...