Evans752

iTrader: (29)

I have been thinking about buying roller rocker, I am looking real hard at the Jessels but I am open to suggestions of other brands. I am pretty sure that I will have to use valve cover spacers or Nasty Performance raised valve covers. Can you see any performance or power gain on the dyno with buying them. You can look at my signiture below and see what I have. Thanks

JPH

iTrader: (2)

I would recommend the crane cams quick lift rockers. Depending on what cam profile you have, i would use either there 1.7 or 1.8's. You will spend in the $700 range for there complete set up. Foe more info on them, go to cranes website and check them out. I have used there rockers several times, and they do make a difference in both hp/trq, and quicker aceleration also.

JZ28

iTrader: (3)

If you go to a larger ratio (1.8 instead of 1.7) you will get more valve lift for the same amount of cam lift. You will probably see a slight improvement on the dyno. I think the bigger benefit would be from adjustables, being able to correctly set valve lash. Honestly though, a lot of people will tell you the stockers are tough to beat. They don't look like much, but they do the job. For $700 there are other things I would consider long before rockers. Just my opinion though, if you do end up getting a set, be sure to let us know what you think.

Evans752

iTrader: (29)

I am going to stick with the stock size rocker arm (1.7 ratio) I dont need the extra lift. I already have Futal Motorsports F13 cam wich is 595/585 lift 230/232 onj the duation on a 112+2 degrees advance timing ground into the cam.

Disturbed Bird

iTrader: (9)

go with the scorpions best rockers out and cheap
vengeance racing sells them

JPH

iTrader: (2)

1.7 will be fine. they actually come of there seat at 1.78 to .275 amount of lift then go back to 1.7 ratio, then again go back to 1.78 on the closing side. These rockers make the cam act bigger then it really is.

tilly

iTrader: (5)

There are also Harland Sharp and Yella Terra lightweights you can also look at for rocker arms.

3.4camaro

iTrader: (1)

You don't need new rockers unless you're going solid roller, or your aftermarket heads require them.

1000th post

Old SStroker

Best advice so far.

"Quick lift" also means "hard close" which doesn't do lots of good things for valve bounce on the seat.

The LS OEM rockers are very good pieces with the weak point being the fulcrum bearings. I'd consider using stockers with better bearings/fulcrum as a first upgrade.

For really high end LS engines there isn't a very large choice of rockers. Things can get pricey quickly in that arena.

Jon

rocksws6

iTrader: (4)

The only thing I would use from crane is there valve spring compressor.

vettenuts

iTrader: (4)

In my opinion, yes. The stock rockers have a wide wipe pattern and with aftermarket valve springs will accelerate valve guide wear. Correctly set up, aftermarket rockers can optimize your wipe pattern and minimize guide wear. If you are simply going to bolt them in and not take the time to set them up, don't bother. I have worked with both the Cranes and Yella Terra's, both are very good rockers. I am not impressed by the number of failures I have seen on the Scorpions to date and the Harlands aren't a very good structural design from what I have seen.

PowerShift408

iTrader: (44)

If I were you, I'd look at the yella terra lightweights. Great performance and great price. I know they're what I'm going with.