I am building a stock L98 bottom end with Trick flow 23* heads with the CNC porting #TFS-304000006 with the 1.47 spring and the LT4 HotCam with 1.6 roller rockers but what is the good brand of roller rockers to get and should I get self aligning and take off the guide plates or use the standrd ones and leave the guide plates?

1.470 in. Springs
1.470 in. O.D. single with damper
120 lbs. at 1.780 in. installed height
300 lbs. at 1.280 in.
360 lbs. per inch spring rate
.540 in. max valve lift

I was thinking of using one of these:
Crane Gold Race 1.6 ratio 11759-16
Trick Flow 1.6 ratio TFS-31400511
Summit 1.6 ratio SUM-G6920
I take it the summit and the trickflow rocker are the exact same one no? Are these self aligning?????

Here is the kicker though.....I want to use the GM pn 10105117 head gasket that has a compressed thickness of .028" & is rated for iron or aluminum heads. Now with the 1.6 roller rockers and the thinner gasket what push rod length do I use? I wanna use the thinner gasket to get the compression back up to stock since the CNC porting on the heads increases the chamber volume.
Please help!!!

 

One thing you can do is test two stock pushrods and see how they contact the valve stem. Here is what you do. Install one on the intake and exhaust. Set lash and then rotate the engine byhand or by turning it over with key and coil unplugged.

Note how the rocker tip travels across the stem. It should be centered over the stem. If it is to close the outside (exhaust manifold side of engine), then your pushrod is too short. If it is to close to the inside (intake manifold side of engine) then it is too long.

Thats the best way really. When you have determined, then get a set one size longer or shorter. Sometimes all the mods dont add up to being enough to make a difference but will only be able to tell once you have done some trial and error.

Good luck.

 

please anybody else?

 

or you can buy a geometry tool and adjustable pushrod.
the free tip is the best, unless you have access to a geometry tool.
airdeano

 

Guido hit it on the head, but the stock pushrods should work fine.
Use the guide plates and make sure the rockers will fit under the
valve covers, most of them don't.

 

If your going with stock length you will need a hardened (sp) version. I have the same setup as you minus the cnc porting and I went with 7.3 trikflow rods and Comp pro mag rockers. the standard chevy pro mags will fit perfect under the centerbolts.