Can I use higher redline?

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Jan 12, 2008 | 01:57 PM

NaturalMystic831

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From: Monterey Co., CA

Can I use higher redline?

Can anyone tell me if installing Z06 heads w/yellow springs, yella terra rockers, and chrome moly push rods on my LS1 will allow me to go up to 7k?

Jan 12, 2008 | 02:19 PM

hammertime

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From: Smithton, IL

If the yellow springs are just stock LS6 springs, then I would not push it. Better off with duals of some sort and Titanium retainers for the best safety margin.

Jan 12, 2008 | 02:23 PM

JPH

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Quote:

Originally Posted by NaturalMystic831

Can anyone tell me if installing Z06 heads w/yellow springs, yella terra rockers, and chrome moly push rods on my LS1 will allow me to go up to 7k?

like hammer said, your going to need a good dual spring set up, and cam profile that will carry it that far, better intake and rod bolts IMO.

Jan 13, 2008 | 01:23 AM

NaturalMystic831

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Staging Lane

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From: Monterey Co., CA

thanks guys. I guess 6.5k it is.

Jan 13, 2008 | 02:00 AM

jshelton2006

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i probably wouldn't go past about 6.5k

Jan 13, 2008 | 02:09 AM

99mongooSS

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are you running the factory cam?

Jan 13, 2008 | 02:10 AM

chrysler kid

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From: Mckinney Plano Frisco

unless your running a large cam there is no reason to go past 6500 much less to 7k

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Jan 13, 2008 | 02:38 AM

Smoke Panther

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If you have a cam that makes power that high, go for it with the spring upgrades mentioned earlier...if you just want to peg your factory tachometer, then sell your car

Jan 13, 2008 | 10:31 PM

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Ilikeppie

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so i have a duel spring comp set up with titanium retainers and a h/c swap what would be the max rpm without harming the motor?

Jan 13, 2008 | 10:36 PM

#11

SladeX

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only go as high as your cam can go, anything higher is pointless. If stock, the 6200 is fine. If you have a mild street cam, most will peak just before or around 6000rpm, 6500rpm is nice, but not necessary.

I have my setup peaking about 5700 rpm give or take, I've played with 6500rpm redline only because without gears, it allows me to finish the 1/4 in 3rd on sluggish hot days when the engine doesn't want to rev quick.

Jan 13, 2008 | 10:36 PM

#12

RIDINFILTHY

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From: florida

i go 7k with 918s and factory steel retainers been going strong for 5k miles.. hope it lasts a while,but if u have the money i would get duals and titanium ret. but good luck

Jan 13, 2008 | 11:48 PM

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KingSumthn

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your cam is pretty much the deciding factor on redline, not the heads, i would think changin your heads would give you more power up to your redline, but not raise it

Jan 14, 2008 | 08:36 AM

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JPH

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From: Fort Wayne, IN

Quote:

Originally Posted by RIDINFILTHY

i go 7k with 918s and factory steel retainers been going strong for 5k miles.. hope it lasts a while,but if u have the money i would get duals and titanium ret. but good luck

have you ever slowed your shift points down a couple hundred rpms, and seen if your car got any faster? just curious.

Jan 14, 2008 | 02:20 PM

#15

hammertime

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From: Smithton, IL

Quote:

Originally Posted by KingSumthn

your cam is pretty much the deciding factor on redline, not the heads, i would think changin your heads would give you more power up to your redline, but not raise it

Depends on the head. With the stock cam in an LS1, a back to back test in Hot Rod found that the gains peak to peak amounted to 37HP (421@5800 stock vs. 458@5900 w/ AFR). The test pulled to 6500 rpms though, and the gains increased to 58HP (393@6500 stock vs. 451@6500 w/ AFR).

That is power that is a huge benefit at shift recovery, and I would think it justifies a higher shift point, if not a higher redline.