Rocker Questions
04-02-2005, 01:20 PM
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Rocker Questions Well before anybody says anything, I did do a search and could not find the info I was looking for. That being said, I am getting together some bolt on parts to put on the TA, and I am thinking about the SLP 1.85 rockers. I know your are going to say for that money get a cam, but I dont plan on cammin the car. So should I get the rockers and what type of power gains have yall seen from them? Will I get more rocker noise from stepping up the ratio to 1.85 from stock? Any problems with these rockers? Thanks for your input.
04-02-2005, 06:12 PM
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I put them on the '00 FRC I had...Felt like maybe 10hp gain, but with the added Z06 springs and upping the rev limiter to 6600...It let you pull each gear longer and gave a full .2 increase in the quarter ET...No extra noise and no one would ever no that they were on the engine vs. the stock 1.7 rockers...
Peace...Gman
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04-03-2005, 01:32 PM
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Originally Posted by Gman2002Z06
I put them on the '00 FRC I had...Felt like maybe 10hp gain, but with the added Z06 springs and upping the rev limiter to 6600...It let you pull each gear longer and gave a full .2 increase in the quarter ET...No extra noise and no one would ever no that they were on the engine vs. the stock 1.7 rockers...
Peace...Gman
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Did you have to retune or did the PCM compensate?
...I like the SLP's, because of their simplicity of design, proven long term relibility and zero maintenace requirement. Bolt on, no valve covers or coil relocation is good too.
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04-03-2005, 03:48 PM
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You can use the stock springs, but you won't be able to up the rev limiter...I would suggest at least putting the '02 Z06 springs on anyway, as long as you are in there adding the rockers...
I used the 1.85 SLP rockers and Z06 spring kit...You DO NOT have to retune, the factory tune will be more than sufficient to handle the extra lift and airflow...I used the factory tune with the only change being the 6600 rpm rev limeter change...
The car ran perfectly normal and was totally impossible to know, by listening, that the rockers were there...
Again, I don't know what real noticeable benefit you will see without upping the rev limiter...10 hp is tough to notice...But the added high rpm power, i.e. power not dropping off at 6200 and pulling hard all the way to 6600 is noticeable...
Peace...Gman
I used the 1.85 SLP rockers and Z06 spring kit...You DO NOT have to retune, the factory tune will be more than sufficient to handle the extra lift and airflow...I used the factory tune with the only change being the 6600 rpm rev limeter change...
The car ran perfectly normal and was totally impossible to know, by listening, that the rockers were there...
Again, I don't know what real noticeable benefit you will see without upping the rev limiter...10 hp is tough to notice...But the added high rpm power, i.e. power not dropping off at 6200 and pulling hard all the way to 6600 is noticeable...
Peace...Gman
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04-03-2005, 07:19 PM
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The stock pushrods are plenty strong enough...You are only adding 9% to the spring load by changing to these rockers...
The Z06 springs are stiffer than that increase over the stock springs, plus, the Z06 cam is lifting another .02" and the Z06 still uses the exact same pushrods...
Peace...Gman
The Z06 springs are stiffer than that increase over the stock springs, plus, the Z06 cam is lifting another .02" and the Z06 still uses the exact same pushrods...
Peace...Gman
04-03-2005, 07:40 PM
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Originally Posted by Gman2002Z06
Probably right, but if you want some peformance increase and still remain stock enough to pass warranty and emissions...It makes it worth it...
Peace...Gman
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04-03-2005, 11:03 PM
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Basically it comes down to this:
They couldn't hurt but there are better mods out there.
If you have the cash and you want to do the rocker arms then go for it.
Keep in mind however that there are cams that can idle/drive/sound like stock and still pass emissions. And LS6 cam/spring swap would be great and can be had for very little investment.
They couldn't hurt but there are better mods out there.
If you have the cash and you want to do the rocker arms then go for it.
Keep in mind however that there are cams that can idle/drive/sound like stock and still pass emissions. And LS6 cam/spring swap would be great and can be had for very little investment.
04-04-2005, 12:28 AM
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Gman, on your '00 FRC what rpm did you shift at before the rockers? and I know you said after you set your rev limit at 6600 so what did you shift at?
04-04-2005, 04:52 AM
#18
Originally Posted by Gman2002Z06
The stock pushrods are plenty strong enough...You are only adding 9% to the spring load by changing to these rockers...
The Z06 springs are stiffer than that increase over the stock springs, plus, the Z06 cam is lifting another .02" and the Z06 still uses the exact same pushrods...
Peace...Gman
The Z06 springs are stiffer than that increase over the stock springs, plus, the Z06 cam is lifting another .02" and the Z06 still uses the exact same pushrods...
Peace...Gman
I thought the Z06 pushrods were shorter than the LS1 since the base circle of the cam was different. Since you are pushing the springs farther, upgrading to stiffer springs and accelerating them faster wouldn't it seem worthwhile to include pushrods in this change?
04-04-2005, 11:29 AM
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If you have an '02 then you don't need to upgrade the springs! They are the same Z06 springs. ALL '02 LS1 & LS6 engines came with the same springs, clutch, oil pump, intake, hydraulics. I would buy a set of Harlan Sharp 1.8 for $330 shipped and forget about SLP rockers 
04-04-2005, 03:45 PM
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The thing I like about the SLP's is that you just bolt them down and thats it, are the other ones like that or do you have to put studs in and use that other kind of nut with the allen screw in the top.