02-23-2021, 02:52 PM | #85 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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It would give me the added benefit of a smaller chamber. Like you said I want to go to a reliable cam setup under .600 with a better profile. If people can boost these engines to 600-700hp, I don't see why I can get a smaller chamber and run E85, which I run 100% of the time anyway. Maybe it would make up for the loss in lift and cam ramp. |
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02-23-2021, 02:54 PM | #86 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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That being said, I think there is a pretty big conflict on interest here in them selling aftermarket castings. I've never seen a GM TSB or anything about seats "falling out" especially in stock applications. |
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02-23-2021, 02:58 PM | #87 | |
Drives: 2018 Camaro 1SS Join Date: Apr 2018
Location: Gilbert, AZ
Posts: 47
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Camaro 1SS M6 - LT2 IM, 1-7/8" Speed Engineering Headers & catless 3" x-pipe to Borla ATAK NPP axle back, Mishimoto Catch Can, BTR Rocker Arm Trunnion kit, E85, 95MM TB, JLT CAI, 180* T-Stat, & SJM line lock - Tuned by Ted Jannetty
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02-23-2021, 04:09 PM | #88 |
Drives: 2016 Camaro 2SS Join Date: Apr 2018
Location: Central Texas
Posts: 1,011
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They Edelbrock heads also require you to use Kooks headers so if you have headers already I'd skip the Edelbrocks.
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02-23-2021, 06:00 PM | #89 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,764
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Aside from that GM never acknowledged or issued a TSB for LS7's which were notorious for dropping valves even stock. Pray, GPI, and TSP have all mentioned at one point that the stock seats are a issue in heads cam applications. Pray has even had a failure in one of his FBO bolt-on hi ram cars. I also agree with Old man and Parish that valvetrain instability could of also been a player. Your springs might not of been shimmed correctly or incorrect lifter preload. Either way I am just pointing out that the stock seats are a weak point on factory castings.
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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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02-23-2021, 06:28 PM | #90 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,701
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I’m enjoying my Mast Black Label heads FWIW. Nice product. Support is a little on the slow side unfortunately, but to be fair I haven’t needed any since I bought them.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion 1059 WHP/944 WTQ, 9.48@150
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02-23-2021, 06:30 PM | #91 |
Drives: 2019 Camaro 1LE Shock Candy Join Date: Mar 2016
Location: Garage
Posts: 1,755
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A lot of good info here, my lift is 645 so I have decided to send my heads to Katech for porting and assembly. I have purchased so far the harden push rods BTR, Texas Speed upgraded springs, Smith Brothers Kit, and LS7 lifters. After reading this post and what oldman has said I am getting harden valves and I probably will purchase another set of lifters. GPI has the race LS7 lifters that are an upgrade on the LS7 lifters. My car is not a daily and will be a weekend car, not high mileage so that should help. 1/4 of a Mile at a time. Lol
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LT4 1.7 Supercharger snout ported & Meth
103 Katech TB, KATECH Custom Heads TSP Headers, Spec P Super Twin Clutch, TSP EL C7 CAM Diamond Piston & Manley Rods, Roto Fab Big Gulp BTR Push Rods,LS7 Lifters, ARP, FI Chiller, Kirkey Seats SJM Line Lock, Hurst Pistol Grip. 747/739 RWHP street tune - 821/794 RWHP track tune 98 octane. 2014 Mini Cooper countryman S All4 M6 daily driver |
02-23-2021, 06:58 PM | #92 |
2019 ZL1 1LE MY GOON
Drives: 1980 Z28 Big Red. Join Date: Dec 2018
Location: Stoney Creek
Posts: 2,061
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Wow I missed a lot while working. I must say, to me, in that picture it looks like the seat broke...maybe a couple chunks. The burnt seats I have looked at I don’t recall looking like they were missing a chunk. Maybe I’m wrong. Usually aggressive valve seat angles combined with lots of heat will cause the angle to burn. I bet your valve was bouncing and possibly caused that seat to chip.
Regardless again maybe my eyes are playing tricks on me but.....I think that seat chipped from what I can see. It would be interesting to know how many angles were used for the valve job and what degrees were the angles machined at.? |
02-23-2021, 08:28 PM | #93 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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Quote:
So found more things, #5 exhaust valve appears to be bent, it was hard to take out, and I put another cylinder exhaust valve in and it went in easy: Also, every single other intake valve, #5, #3, and #1, all have this same chipping or burning or whatever it is damage: So I was thinking with an aftermarket casting I could get a smaller combustion chamber but apparently not the TSP one only goes down to 54 CC chambers. I think I estimated I was around the same 55 or 54 CC or something like that with my .030 mill. My dream build is very high compression E85 motor but everyone I ask gives me a lot of negative feedback or the "just put a turbo on it". |
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02-23-2021, 08:43 PM | #94 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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Quote:
Also my springs didn't have shims? TSP installed the springs before it was shipped to me, but there aren't any shims? I do have their supposed "exclusive" "integrated" seat/seal so not sure if they made the seat the correct height for our application? I mean the whole point of shimming the springs is to get a certain more stable and predictable force range compared to the expected valve travel? |
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02-23-2021, 09:15 PM | #95 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,764
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That doesn't seem right to me because the Johnson's call for less preload then LS7 lifters so I don't see how standard length pushrods are correct.
Imo while you have it apart get a cam spring package from Cam motion, keep the lift around .600, and get a better set of heads...CID, Mast, Frankenstein...etc. keep the Johnson lifters if they are not damaged, and measure for correct push rod length. Don't use the thread turn method for finding the correct preload. Get a adjustable push rod and a digital caliper. Using the EOIC method, Find zero lash with the adjustable push rod by increasing the length of the APR until there is no slack in the rocker. Measure the APR with the caliper, add the desired lifter pre load to the Caliper measurement along with .012 for heat expansion. Then order that length of push rod. Manton makes custom pushrods if need be. For example...if the APR measures 7.8 @ Zero lash, then add .035 for Johnson's recommended preload and .012 for block/head expansion when warm. The measurement equals 7.847 so a 7.85 would probably suffice which is standard length.
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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 Last edited by KingLT1; 02-23-2021 at 09:27 PM. |
02-23-2021, 09:21 PM | #96 |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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No expert!
I have been told shining the springs to within .060-.080 of bind at full lift causes the coils to bump into each other and dampens the spring which makes it much more effective. I can tell you with no shims I could only spin to 6600-6700 depending on boost level. After adding a .050 drop lock I could spin it 300rpm higher. I think I was sill .020+ short of being .060-.080 from bind.
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
02-23-2021, 09:24 PM | #97 | |
Drives: 17 SS a8 Join Date: Feb 2010
Location: omaha
Posts: 1,678
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Quote:
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dropped a valve in the 6.2. now running a drop in rods and piston 5.3
best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472 |
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02-23-2021, 09:32 PM | #98 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,764
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I have used Manley's in the past and the advertised length was spot on with my Digital Caliper. Either way measure the pushrod you order with the digital caliper to make sure it lines up with your measurents taken and everything should be fine. It's what I have done in the past with no issues. Some companies will allow you to swap out pushrods to a different length if they haven't been installed and ran.
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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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