Harland Sharp Roller Rockers
This is a discussion on Harland Sharp Roller Rockers within the Internal Engine forums, part of the LSx Technical Help Section category; anyone know if a 1998 trans am ls1 can accept the 1.8 harland sharp non-adjust roller rockers? do i need ...
11-26-2008, 09:44 AM #1
Harland Sharp Roller Rockers
anyone know if a 1998 trans am ls1 can accept the 1.8 harland sharp non-adjust roller rockers? do i need different valve springs or valve covers or anything? stock ratio is 1.7 i believe so these should prob give a good 10-15 rear wheel hp right? my car has 52,000 miles on it.
11-26-2008, 10:23 AM #2
i'd do some stiffer springs and some new pushrods, stock ls1 springs are real beat and are susceptible to valve float. you should pick up 10-20 wheel with some added rpm...added rpm is prob best part about it. i've seen dyno graphs with rev kit-only installed and they produced nice power gains up to 6300. definately worth it if you dont intend on getting your stick swapped anytime soon. with this, a good flowin exhaust, and a nice tune you will be surprised at how well your car can perform in stock trim.
Last edited by side2000; 11-26-2008 at 10:34 AM.
11-26-2008, 11:52 AM #3
11-26-2008, 12:19 PM #4
I would go with some hardened push rods to
11-26-2008, 12:24 PM #5
Springs are easier to do with the heads off
Crane cams makes a spring remover for ls1's
If the heads are still on the motor
you need a compressor with a hose adapter to
keep the valve from dropping
11-26-2008, 12:24 PM #6
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Personally, I would stay away from 1.8 rockers. Instead, I would do a cam. The main reasons being that you can get the exact type of change you want, and you won't be limited later if you do decide to put in a cam.
It is more work, but with both it is a good idea for the springs anyways, and you will see bigger gains from the cam only with the price for parts remaining rather close (though with a cam swap I would also get a LS2 timing chain, and LS6 ported oil pump).
11-26-2008, 12:48 PM #7
11-26-2008, 08:41 PM #8
11-27-2008, 07:10 PM #9
11-27-2008, 07:12 PM #10
Make sure both valves are closed when installing each set of rockers or you can break the rocker or the pedestal.
11-29-2008, 07:15 AM #11
ok cool thanks for all of the help guys. might hold off for now. didnt think id have to change springs for just a roller rocker install. they must make the stock springs pretty weak.
11-29-2008, 09:22 AM #12
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