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Will ls7 lifters make motor........

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Old Dec 26, 2013 | 11:31 AM
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Default Will ls7 lifters make motor........
Not rev pass 7000 with brand new springs pac 1208x springs
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Old Dec 26, 2013 | 11:01 PM
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Sounds like a lifter problem. You running stock ls7 lifters? Try some aftermarket lifters
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Old Dec 27, 2013 | 09:22 AM
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What's the rest of the valvetrain?
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Old Dec 27, 2013 | 10:43 AM
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I'm revving past 7000 with stock LS3/LS7 lifters in my LS3...you sure the pushrod length is correct?
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Old Dec 27, 2013 | 11:13 AM
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JakeFusion nailed it, depends what the rest valvetrain is...??? A valvetrain is like a chain, its only as strong as its weakest link. If one piece isn't right, it compromises the entire system.
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Old Dec 27, 2013 | 12:35 PM
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The LS7 revs to 7k without issue and beyond because of lightweight over the nose rockers, good springs and REALLY light (titanium) valves.

Turned down LS3 valves are a great way to go. I think the 1.8:1 ratio helps too. Lifter works harder but doesn't move as much.
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Old Dec 27, 2013 | 04:48 PM
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I believe the PCM will cut the fuel at 6,200 RPM. Did you tune this higher?
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Old Dec 28, 2013 | 10:35 AM
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well i think we kinda nailed it and going to get new set of lifters and rockers.
ls7 lifters and yella terra 1.7 rockers are in it now trying to rev it to 7500 and its not.. pushrods are correct length...pac 1208x springs. i have more than enough spring lol...

so im selling my yella terra rockers and ls7 lifters asap
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Old Dec 28, 2013 | 11:31 AM
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Just swapping to stock rockers will free up more rpm.

1208 is a lot of spring. Do you have heavy valves? Stiff pushrods (larger than 5/16)? What heads? What lobes on the cam?
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Old Dec 28, 2013 | 11:36 AM
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Originally Posted by JakeFusion™
Just swapping to stock rockers will free up more rpm.
^^This will definitely help.^^

And lightweight valves will be VERY beneficial if you don't already have them.
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Old Dec 28, 2013 | 12:38 PM
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trickflow heads with ferrea 2.100 intake valves and 1.600 this is how they come from TEA
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Old Dec 28, 2013 | 03:01 PM
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Heavy valves. I'd swap to PM guides, run stock rockers, morel or Johnson lifters, and PAC 1207 springs. And 3/8" pushrods.
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Old Dec 28, 2013 | 08:17 PM
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i'd swap to BTR SLR lifters if your going to change unless you go with a link bar setup
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Old Dec 28, 2013 | 09:29 PM
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was the motor dynoed ? where did it make peak power ?what cam do you have in the motor ?what is you lifter preload ?
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