On a quest to make 408 as quite as stock
On a quest to make 408 as quite as stock I need to find out what I need to do to make my 408 as quite as a stock LQ9. My motor sounds like a damn train, and it sounds like its ready to fall apart at anytime. Im sick of it, what do I need to buy to make this thing quite again. MOney os no object at this point.
are you talking about your exhaust or engine noise ? if engine noise you may get some caddy lifters and get the proper preload and it will quitten down quite a bit if valvetrain noise is the culprit .
Im talking about engine noise. I was thinking about the caddy lifters but damn I just put in some new LS7 lifters. Im thining about adding a little more preload just to see if it helps and run some 7.425 instead of the 7.400. I don't think it will hurt anything seeing how big the window is on preload. I also don't think the Mahle short skirt pistons help with noise, but hey thats what I have to work with.
BTW I just had the truck on a mustang dyno. I only ran it up to 6300rpm and kept the timing at 26 degress. How much timing are you guys runnnig at WOT? Im also told you can run this thing up to 6900rpm. Anyway it made 472 like it was.
BTW I just had the truck on a mustang dyno. I only ran it up to 6300rpm and kept the timing at 26 degress. How much timing are you guys runnnig at WOT? Im also told you can run this thing up to 6900rpm. Anyway it made 472 like it was.
I agree, I was not unhappy with the numbers, but with the timing way down like that and the rpms being cute way short was a bummer. I will take it back down next month and add a few degrees to it and run it to 6900rpm. The graph showed that it was still pulling at 6300.
So what do you think about the longer pushrods and lifters?
So what do you think about the longer pushrods and lifters?
Trending Topics
Don't even think about putting in longer push rods. I tried running 7.425 and lost 20rwhp. Then tried 7.450 and lost another 20rwhp. Then went back to the 7.40 and my valve seals started to leaking oil. Learn from my mistake!!!
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
