G Atsma

I remember that being done. Oil on headers is no fun.....

grinder11

iTrader: (1)

Gary, that old 1/4 turn you mention, I remember well. I wonder why the LS engines dont do that? The lifters are one of the few things that are interchangeable between ghe old and new. So why wouldnt the 1/4 turn work on the LS. Actually, the first LS I ever built used SBC roller lifters, Eaton anti-pump ups. Remember them? Anyway, never had a problem with them going to 7k rpm

LS1Formulation

iTrader: (13)

It won't work because unlike the old smallblock, which basically had the rocker arm floating above the pushrod/ valve spring and was adjusted up and down the stud with a locknut, the LS has a smaller diameter bolt that is fully seated at all times. A non-adjustable valvetrain, basically.

G Atsma

The rockers are not adjustable on LS engines. The old ones were a ball pivot and tight threaded nut. Now a needle bearing trunnion with fixed geometry fastening.

grinder11

iTrader: (1)

My fault. I know they aren't adjustable. I should've worded it like; why not obtain just .010"-.020" preload from zero lash? I don't remember the thread pitch of the SBC rocker stud, been involved in these LS builds for so long. So let's assume the SBC used either 3/8-16 studs, or 3/8-24 studs. The 1/4 turn on the 16 pitch would be approx .016" from zero, not counting the rocker ratio. The 24 pitch would be approx .010". My memory is going 3/8-24, so about .010" preload. Whatta ya think?

grinder11

iTrader: (1)

Any thoughts on this, guys??

LS299S10

That's about .100 short of what I like to run. I run my ls engines in the .100 to .120 preload range.

But to your point maybe. Remember the net lash GEN 5 big blocks? There was a stud kit available to make them adjustable like the old style. IIRC they were 8mm too. Wouldn't be too hard to set that up on an ls. Except for maybe keeping the rockers on the valve tips.