After camshaft install big trouble
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
After camshaft install big trouble
Hi
New LS6 style cam lifters in car and problem is valvetrain sounds like ****, engine have trouble holding rpm up almost engine die, also no power and shudder misfire when appliyng power, engine before cam install ran totally problem free, now i have code P0300.
I have set rockers 22lbs as per several instructions so i know this is ok done twice but still terrible valvetrain noise.
When i installed camshaft i am ” almost ” certain that i got the cam correct against the crankshaft marking but i never did the test of rotating the engine several turns to see if the dots lined up every time stupid me, so my question is this can the engine still run and give these symptoms with the camshaft off by one mark on camgear sprocket chain ?
Regards Mats
New LS6 style cam lifters in car and problem is valvetrain sounds like ****, engine have trouble holding rpm up almost engine die, also no power and shudder misfire when appliyng power, engine before cam install ran totally problem free, now i have code P0300.
I have set rockers 22lbs as per several instructions so i know this is ok done twice but still terrible valvetrain noise.
When i installed camshaft i am ” almost ” certain that i got the cam correct against the crankshaft marking but i never did the test of rotating the engine several turns to see if the dots lined up every time stupid me, so my question is this can the engine still run and give these symptoms with the camshaft off by one mark on camgear sprocket chain ?
Regards Mats
Le Mans Master
Joined: Jul 2010
Posts: 5,972
Likes: 719
Hi
New LS6 style cam lifters in car and problem is valvetrain sounds like ****, engine have trouble holding rpm up almost engine die, also no power and shudder misfire when appliyng power, engine before cam install ran totally problem free, now i have code P0300.
I have set rockers 22lbs as per several instructions so i know this is ok done twice but still terrible valvetrain noise.
When i installed camshaft i am ” almost ” certain that i got the cam correct against the crankshaft marking but i never did the test of rotating the engine several turns to see if the dots lined up every time stupid me, so my question is this can the engine still run and give these symptoms with the camshaft off by one mark on camgear sprocket chain ?
Regards Mats
New LS6 style cam lifters in car and problem is valvetrain sounds like ****, engine have trouble holding rpm up almost engine die, also no power and shudder misfire when appliyng power, engine before cam install ran totally problem free, now i have code P0300.
I have set rockers 22lbs as per several instructions so i know this is ok done twice but still terrible valvetrain noise.
When i installed camshaft i am ” almost ” certain that i got the cam correct against the crankshaft marking but i never did the test of rotating the engine several turns to see if the dots lined up every time stupid me, so my question is this can the engine still run and give these symptoms with the camshaft off by one mark on camgear sprocket chain ?
Regards Mats
Last edited by helga203; Apr 29, 2020 at 07:06 AM.
Pro
Joined: Mar 2004
Posts: 714
Likes: 104
From: Springfield Ohio
You generally have to change pushrods after a cam change and that would be my first guess as the core of the problem. Did you measure pushrod length with an adjustable pushrod checker before buying pushrods? The link below has some good pushrod info might be helpful.
https://www.lsxmag.com/tech-stories/...oad-ls-engine/
https://www.lsxmag.com/tech-stories/...oad-ls-engine/
Last edited by tbrowne; Apr 29, 2020 at 08:14 AM.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
tune could be off as well, you can't install a cam and expect it to run perfectly... sometimes it will start and idle decent, sometimes not... did you also change injectors?
Last edited by StingrayRebel; Apr 29, 2020 at 10:03 AM.
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
You generally have to change pushrods after a cam change and that would be my first guess as the core of the problem. Did you measure pushrod length with an adjustable pushrod checker before buying pushrods? The link below has some good pushrod info might be helpful.
https://www.lsxmag.com/tech-stories/...oad-ls-engine/
https://www.lsxmag.com/tech-stories/...oad-ls-engine/
LS6 pushrod length was it the same as LS1, info i have say it was so ?
I am almost in the process to get into the camgear to check cam installation if i missed that part, a pain to get steering rack out.....i will first check the pushrod length as you suggest sound in valvetrain probably is that issue also maybe.
Last edited by MatsA; Apr 29, 2020 at 02:44 PM.
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
Yes car should be tuned, LS1 injectors on the engine, all sources i have say car should run and behave ok as is but would gain much from a proper tune, as it is now it feels like i have a 30% of power and engine sounds like a stone masonry in the valvetrain.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
Looked into more info at LS1tech also and it seems more and more like i have pushrod problem, 243 / 241 heads have different length of valve steams and also Z06 camshaft have different base circle compared to LS1 camshaft so only common thing is 7.40 pushrod length.
Z06 type cam on 241 heads would require longer pushrods i did see some info it would be 7.425 iso 7.40 but i have ordered a pushrod length checker to be sure, thanks for the help.
Z06 type cam on 241 heads would require longer pushrods i did see some info it would be 7.425 iso 7.40 but i have ordered a pushrod length checker to be sure, thanks for the help.
Pro
Joined: Mar 2004
Posts: 714
Likes: 104
From: Springfield Ohio
Here's a quick tip: Wrap the threads on the pushrod checker with white plumbers tape when you get it. The tape will keep the two halves of the checker from turning too easily allowing you to make more accurate readings. Without the tape, it can be difficult to pull the checker out of the heads without it changing length a little.
Last edited by tbrowne; Apr 29, 2020 at 04:13 PM.
Thread Starter
Racer
Joined: Jun 2016
Posts: 254
Likes: 67
From: Uppsala Uppland Sweden EC
2024 C6 of the Year Finalist - Modified
Ok measured length is 7.3 with checker and this is on a motor that have been run so should i add preload to 7.3 or not ?
Comp cam lifters OEM replacments.
Comp cam lifters OEM replacments.