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07-25-2022, 06:33 PM
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#15 | |
          
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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Quote:
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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08-05-2022, 02:37 PM
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#16 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 807
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Thanks for the feedback, folks.
All LT4's come with Ti on the intake side so figured durable enough for Chevy - good enough for us especially since valve float might have been limiting our topspeed/engine rpm. We'll probably go with new OEM exhaust to keep it simple.
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02-20-2023, 01:30 AM
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#17 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 807
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Been waiting on Chevy parts store to get the OEM exhaust valves in stock to no avail. Noticed on Katech's website they had them and two weeks later - arrival! Surprised, but possibly I shouldn't be...
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10-29-2023, 09:24 PM
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#18 |
 Drives: 98 Camaro Join Date: Apr 2022
Location: MD
Posts: 274
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So does the lt1 have inconel exhaust valves stock? I’m guessing lt4 does for sure
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10-29-2023, 10:02 PM
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#19 |
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Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,322
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I think the LT1 and LT4 both have plain exhaust valves, I think for FI and E85 Manley stainless steel, or Manley Inconel would be my two choices. I've run Manley since dunno the 70s?? I like their slight undercut head design for flow and they are straight and true out of the box, not many other brands of "performance" valves. I've seen many destroyed OEM valves, so IMO they are not "good enough", when you are talking about doubling the OEM HP levels and toss in some high lift cam / high ramp speed.. Sorry I would only go Manley, like their boost line con rods too.... um. sweet.
https://www.manleyperformance.com/wp.../08/valves.pdf
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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10-30-2023, 09:57 AM
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#20 | |
 Drives: 2015 Camaro ZL1 Join Date: Oct 2020
Location: Clinton Twp, Michigan
Posts: 249
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The L8T did come with an inconel exhaust valve which is a direct replacement (a few gram heavier though) for the LT1/LT4 exhaust valve. https://katechengines.com/i-30498177...ust-valve.html |
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10-30-2023, 01:44 PM
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#21 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 807
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To close this thread out a bit - the valves I purchased from Katech were actually high heat inconel vice OEM replacements. They are ~15 grams heavier than the OEM's. But with the PSI 1516's, should be no issue on control according to Katech.
It is running fine so far...although still break in period. ;-)
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10-30-2023, 03:32 PM
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#22 |
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Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,322
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I really enjoyed your write up Tim. I may have to get some suggestions when I start my next engine project, but my new farm in Hawaii is taking all my time and money.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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11-04-2023, 01:32 AM
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#23 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 807
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oldman: Your posts are a wealth of info - unlikely I have anything to offer. :-)
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