need help - noise after rebuild
09-15-2021, 03:27 PM
#11
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Yeah that is how my LS7 lifter valvetrain sounds like. It is louder than my muffler and annoying as all get out. If I ever run some aftermarket heads I will be buying new lifters lol
09-15-2021, 03:39 PM
#12
100% Redneck
09-15-2021, 03:40 PM
#13
TECH Veteran
Yeah I have no beauty cover on mine. About to hit a year in November.
09-15-2021, 03:53 PM
#15
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I use the cheap "LS7" lifters on a SS2 cam and it sounded exactly like your videos with OEM and aftermarket 7.4 pushrods. The LS7 lifters have a pretty big tolerance on preload so IMO that slightly longer pushrod you went with is still in spec as well as the OEM. I went with aftermarket heads and swapped the cam to a TSP V4 Torquer. This time I went with Morel 6504 lifters that have a very small preload window compared to the LS7 lifters. Measuring I used a 7.525 pushrod because of the PRC heads thicker deck and thicker LS9 gaskets. That sewing machine noise went away and the valvetrain is quiet as a mouse. I'm pretty sure it was those generic Delphi LS7 lifters making the noise.
Here is my LQ9 with the cheapo LS7 lifters & SS2 camshaft sounds like a sewing machine. Ran strong but a little annoying at idle.
The sound on my GoPro kinda goes in & out but you can hear the noise.
https://www.youtube.com/watch?v=8F3i3VeCAsM
Swapped to hardened 7.4 pushrods and a trunnion kit and still had the noise.
https://www.youtube.com/watch?v=txQJ36VafO4
Here is my LQ9 with the cheapo LS7 lifters & SS2 camshaft sounds like a sewing machine. Ran strong but a little annoying at idle.
The sound on my GoPro kinda goes in & out but you can hear the noise.
https://www.youtube.com/watch?v=8F3i3VeCAsM
Swapped to hardened 7.4 pushrods and a trunnion kit and still had the noise.
https://www.youtube.com/watch?v=txQJ36VafO4
And idk what I love more, your rcsb or your garage!
09-15-2021, 04:18 PM
#16
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from back in 2017 when I BOUGHT the lifters. I'd hoped better but not much I can do now. my Smith bros trunnion bushings are a bit tight too. Replacing them with stockers to test, and I'll go from there but it sounds like I may be replacing lifters. again. Guess now's a good time to look for some cheap squareport heads.
09-16-2021, 09:33 AM
#18
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Nah, but I wanted to ensure I didn't have to re-buy injectors. I was building for ~1k on e85 end goal and 210s fit the bill.. before I found out they're a pain to tune as you've pointed out. as of this moment they're not a problem though so we'll see what happens when/if I figure out what I/all responses I've received lead to believe to be a VT issue.
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