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Valvetrain issue I need help bad

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Old Feb 25, 2014 | 06:48 AM
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Default Valvetrain issue I need help bad
Ok setup is a 408 ls1 with trickflow heads. Ls7 lifters yella terra rockers comp 251 270 .638 .596 PAC 1208 springs with 1.79 installed height. Car is making great power. Car peaks at 6850 no matter what we do. I have spent over 3000 dollars trying to chase this issue but now I'm fed up. Put a stock rocker on it with trunnion upgrade didn't work put thicker pushrods on it didn't work change springs and shim them didn't work. Change cam to bullet grind didn't work. Do y'all think the ls7 lifter can't keep up with the amont of spring pressure I have in it. Please input on this.when it peaks it falls off like a rock
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Old Feb 25, 2014 | 06:50 AM
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Originally Posted by LS1NOS408
Ok setup is a 408 ls1 with trickflow heads. Ls7 lifters yella terra rockers comp 251 270 .638 .596 PAC 1208 springs with 1.79 installed height. Car is making great power. Car peaks at 6850 no matter what we do. I have spent over 3000 dollars trying to chase this issue but now I'm fed up. Put a stock rocker on it with trunnion upgrade didn't work put thicker pushrods on it didn't work change springs and shim them didn't work. Change cam to bullet grind didn't work. Do y'all think the ls7 lifter can't keep up with the amont of spring pressure I have in it. Please input on this.

Put a mast intake on it same thing also.
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Old Feb 25, 2014 | 08:28 AM
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And I'm dynoing on slicks also
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Old Feb 25, 2014 | 08:37 AM
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Is it still pulling at 6850 or is it starting to level off?
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Old Feb 25, 2014 | 09:01 AM
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Originally Posted by Exeodus
Is it still pulling at 6850 or is it starting to level off?
Falling off bad and everything is brand new
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Old Feb 25, 2014 | 10:25 AM
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here is the dyno sheet
Attached Images
File Type: bmp
rsz_1dyno_new_cam.bmp (108.1 KB, 72 views)
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Old Feb 25, 2014 | 10:36 AM
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What's your fuel system setup? What size injectors? What fuel pump? Who's tuning it?

What's the air/fuel ratio get to at those RPMs?
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Old Feb 25, 2014 | 10:36 AM
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Would not be he first time I have seen that happen with stock lifters. We could not keep a stock LS6 cam stable with HS 1.8RR without going to a short travel lifter. PAC-LFT106-LS.
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Old Feb 25, 2014 | 11:14 AM
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this is untuned because all we did was changed cams. walbaro 255 pump with a fast 60 lb injectors 12.9 to 13.0 afr with c16 in the tank
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Old Feb 25, 2014 | 11:15 AM
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the other cam was tuned perfect
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Old Feb 25, 2014 | 11:22 AM
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What kind of lobes was the old cam using compared to the new one?

What kind of valves? What rpms are you aiming for?
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Old Feb 25, 2014 | 11:54 AM
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7500 is what i am aiming for the lobes on the comp cam was very aggressive lobes and and the new cam from bullet is on not so aggressive lobes. i have trickflow heads with ferrea valves 2.100
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Old Feb 25, 2014 | 11:55 AM
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not just 7500 i just want it to curve and not hit a wall
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Old Feb 25, 2014 | 11:58 AM
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What intake/tb are you running?

EDIT: just reread your second post.
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Old Feb 25, 2014 | 12:02 PM
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How much power is it putting down before it falls off?
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Old Feb 25, 2014 | 12:03 PM
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Super vic port matched with accufab 4150 and it made 548 at 6850 then fall off
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Old Feb 25, 2014 | 12:03 PM
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Thanks for all you guys help
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Old Feb 25, 2014 | 12:35 PM
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After speaking with alot of people they saying ls7 is like 75 percent of my problem
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Old Feb 25, 2014 | 12:48 PM
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Like I said take a look at the lifters I posted. Those will get you moving.
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Old Feb 25, 2014 | 12:51 PM
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Ok turbo buick6 lifters is on the way
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