1.8 Ratio Gm Ls7 Rocker Swap
02-14-2006, 02:00 AM
#23
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If this works out, it will be a very cheap way into 1.8 rockers. SLP just "re-released" their OEM style 1.85 rockers for around $600 (re-released = charge $150 more for the same product).
02-17-2006, 08:28 PM
#24
The P/N for the LS-7 rockers (exhaust) is 12579617.
If anyone has tried this mod, please post your results!!
If anyone has tried this mod, please post your results!!
Originally Posted by Bob25thTA
BlownZ06 do you have the P/N. for exhaust rockers?
05-16-2006, 10:58 PM
#26
Premium Supporting Vendor
Guys.. just seeing this thread again.
I have had the rockers on the car for about 800 miles now and carried them to a 6.86 @ 106.3 in the 1/8th... easy 10's at over 130.
They are working beautifully. You can get a whole set from Gene at Fred Beans for about $160.
I have had the rockers on the car for about 800 miles now and carried them to a 6.86 @ 106.3 in the 1/8th... easy 10's at over 130.
They are working beautifully. You can get a whole set from Gene at Fred Beans for about $160.
05-16-2006, 11:08 PM
#27
Safety Car
Originally Posted by BLOWNZO6
Guys.. just seeing this thread again.
I have had the rockers on the car for about 800 miles now and carried them to a 6.86 @ 106.3 in the 1/8th... easy 10's at over 130.
They are working beautifully. You can get a whole set from Gene at Fred Beans for about $160.
I have had the rockers on the car for about 800 miles now and carried them to a 6.86 @ 106.3 in the 1/8th... easy 10's at over 130.
They are working beautifully. You can get a whole set from Gene at Fred Beans for about $160.
WOW!
So for $160 my car will run the 10's @ 130? 
J/K I couldn't resist. Do you run the same pushrod length?
05-16-2006, 11:13 PM
#28
Premium Supporting Vendor
Originally Posted by RED99
WOW! So for $160 my car will run the 10's @ 130? J/K I couldn't resist.
So for $160 my car will run the 10's @ 130? J/K I couldn't resist. 
Originally Posted by RED99
Do you run the same pushrod length?
05-17-2006, 07:01 AM
#30
Premium Supporting Vendor
Originally Posted by b98
this sounds like a good move.I don't think that everyone who reads this should just suddenly run out and buy them and put them on their car, but they do fit are a cheap alternative to some of the higher end stuff.
05-17-2006, 04:35 PM
#31
Burning Brakes
I purposely went with a lower lift cam so I could change the rockers at a later time if I ever added the LS6 manifold. I think $160 is a very realistic price for rocker arms. $600 rockers better be plated in platinum for me to consider them.
05-17-2006, 10:11 PM
#33
Premium Supporting Vendor
Originally Posted by 1bigdaddy
What are the expected horsepower/torque gains by going from a 1.7 to a 1.8 rocker on a full bolt on motor?? Any ideas?
I did it on my engine since it was pretty cheap and I was putting it together anyway.. with forced induction I think it is different than na.
I think for an na motor.. it would be an exercise that would not get you much.. but.. you could dyno before, swap them and dyno again and tell everyone what it did for you?
05-17-2006, 10:21 PM
#34
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We were wondering when someone would ask this...
A few months ago, we had already mocked up a set of these rockers on an LS1 head, an LS6 head and an AFR head...and *NONE* of them have the correct valvetrain geometry for proper use~ especially for high RPM use. They will physically fit on the heads and the engine will run, but the rocker tip is located *extremely* far out onto the valve tip to the point where only the 1/3 outer edge of the valve tip is engaged on the rocker scrub pad, as measured with the cam on its base circle and the negative condition only gets worse throughout the rocker arm's arc....
Do *NOT* use these rocker arms on the LS1/LS6/LS2 application or we can gaurantee you with 100% certainty in every instance or application that you *WILL* have premature valvetrain failure sooner than later.
We just wanted to to try to stop someone from unknowingly damaging their engine from reading inaccurate information. Good luck to those who are running them or those that still want to try them anyway despite the warning...
Regards,
DTE
A few months ago, we had already mocked up a set of these rockers on an LS1 head, an LS6 head and an AFR head...and *NONE* of them have the correct valvetrain geometry for proper use~ especially for high RPM use. They will physically fit on the heads and the engine will run, but the rocker tip is located *extremely* far out onto the valve tip to the point where only the 1/3 outer edge of the valve tip is engaged on the rocker scrub pad, as measured with the cam on its base circle and the negative condition only gets worse throughout the rocker arm's arc....
Do *NOT* use these rocker arms on the LS1/LS6/LS2 application or we can gaurantee you with 100% certainty in every instance or application that you *WILL* have premature valvetrain failure sooner than later.
We just wanted to to try to stop someone from unknowingly damaging their engine from reading inaccurate information. Good luck to those who are running them or those that still want to try them anyway despite the warning...
Regards,
DTE
Last edited by DTE Powertrain; 05-17-2006 at 10:30 PM.
05-17-2006, 11:01 PM
#35
Melting Slicks
Really...No problems with valvetrain setup here..
Have 6000 miles on mine personally (ARF heads)with no issues, no geometry problems with proper pushrod length.
Have made over 850 rear wheel hp and spin them well over 7000rpm regularly.
I have setup probably 10 vehicles with them with various heads with no issues.
Phil
Have 6000 miles on mine personally (ARF heads)with no issues, no geometry problems with proper pushrod length.
Have made over 850 rear wheel hp and spin them well over 7000rpm regularly.
I have setup probably 10 vehicles with them with various heads with no issues.
Phil
05-17-2006, 11:03 PM
#36
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Suit yourself, but the negative outer edge scrub pattern will remain... From what we have measured and our experience, re-engineered rocker pedastals would correct the issue. Good luck.
Regards,
DTE
Regards,
DTE
Last edited by DTE Powertrain; 05-17-2006 at 11:07 PM.
05-17-2006, 11:11 PM
#38
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OK...hmmmm....different opinions here!! So assuming my setup...afr205's milled to 59cc comp xer 224/228 581/588 114 lsa...so would I be wasting my time/money by upgrading to the 1.8's?? I have upgraded springs good to .650 lift. Good idea or not?????
J
J
05-18-2006, 10:28 AM
#39
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Originally Posted by RoadRebel
Have 6000 miles on mine personally (ARF heads)with no issues, no geometry problems with proper pushrod length.Have made over 850 rear wheel hp and spin them well over 7000rpm regularly.
Phil
Phil
05-18-2006, 11:02 AM
#40
Le Mans Master
Originally Posted by DynoTech Engineering
We were wondering when someone would ask this...
A few months ago, we had already mocked up a set of these rockers on an LS1 head, an LS6 head and an AFR head...and *NONE* of them have the correct valvetrain geometry for proper use~ especially for high RPM use. They will physically fit on the heads and the engine will run, but the rocker tip is located *extremely* far out onto the valve tip to the point where only the 1/3 outer edge of the valve tip is engaged on the rocker scrub pad, as measured with the cam on its base circle and the negative condition only gets worse throughout the rocker arm's arc....
Do *NOT* use these rocker arms on the LS1/LS6/LS2 application or we can gaurantee you with 100% certainty in every instance or application that you *WILL* have premature valvetrain failure sooner than later.
We just wanted to to try to stop someone from unknowingly damaging their engine from reading inaccurate information. Good luck to those who are running them or those that still want to try them anyway despite the warning...
Regards,
DTE
A few months ago, we had already mocked up a set of these rockers on an LS1 head, an LS6 head and an AFR head...and *NONE* of them have the correct valvetrain geometry for proper use~ especially for high RPM use. They will physically fit on the heads and the engine will run, but the rocker tip is located *extremely* far out onto the valve tip to the point where only the 1/3 outer edge of the valve tip is engaged on the rocker scrub pad, as measured with the cam on its base circle and the negative condition only gets worse throughout the rocker arm's arc....
Do *NOT* use these rocker arms on the LS1/LS6/LS2 application or we can gaurantee you with 100% certainty in every instance or application that you *WILL* have premature valvetrain failure sooner than later.
We just wanted to to try to stop someone from unknowingly damaging their engine from reading inaccurate information. Good luck to those who are running them or those that still want to try them anyway despite the warning...
Regards,
DTE
