Justins00ss

iTrader: (18)

Ive had my heads off for a little while now and next week I will be putting the top end back together. I was wondering if there were any tricks to re-installing the rockers and setting them to the correct tq specs? I read on ls1how-to that they just bolt down and tq them in 2 passes to the required tq specs. Is that the correct way? Or do I need special tools to set the correct lash?

trans_am7935

iTrader: (15)

there is no lash on stock rockers. they are self adjusting, so all you have to do is torque them to 22ft lbs. first do it to 10 ft lbs then to 22...but i am just doing this from memory, check your user guide to be safe.

elias_799

iTrader: (8)

on these engines we adjust lifter preload with the pushrod

you need a pushrod length checker

you need to do two passes ? i just thought it was 24ft/lb and that is it

Squirts11

iTrader: (14)

When tightening the rockers, make sure you only tighten the rocker when its respective lifter is on the cam's base circle.

joecar

+1 what squirts11 said...


Service Manual:

# Rotate the crankshaft until number one piston is at top dead center of compression stroke.
In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. If viewing from the rear of the engine, the additional crankshaft pilot hole, non-threaded, will be in the 10:30 position. The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3. Cylinders 1, 3, 5 and 7 are left bank. Cylinders 2, 4, 6, and 8 are right bank.

# With the engine in the number one firing position, tighten the following valve rocker arm bolts:
Tighten
* Tighten exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 N·m (22 lb ft).
* Tighten intake valve rocker arm bolts 1, 3, 4, and 5 to 30 N·m (22 lb ft).

# Rotate the crankshaft 360 degrees.
# Tighten the following valve rocker arm bolts:
Tighten
* Tighten exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 N·m (22 lb ft).
* Tighten intake valve rocker arm bolts 2, 6, 7, and 8 to 30 N·m (22 lb ft).

vettenuts

iTrader: (4)

+2

Here is the GM procedure. Also, I like to use some Redline Assembly Lube on the rocker tip and pushrod tip to prevent a dry start since it takes a while for oil to come up from the lifter.

Justins00ss

iTrader: (18)

Wow. Thanks guys for the info.