Now I'm confused. When removing the rocker arms I could have sworn they
were torqued on. It just seemed that they all took a set amount of
"torque" to loosen. I found a page online that said that they are
"zero/zero" lash. Are these adjustable rockers? I think the heads are the
same castings as a 88-92 350 L-98 Camaro.
> If its hydraulic lifters than you adjust them not torque them. What year
> the engine? I just put together a 400 cid sbc and had some fun adjusting
> the tappets (rocker arms) using the "rocker arm nuts". I put a webpage
> together on it at my 54 Pontiac DIY website (Do It Yourself)
My brother got it new from a Chevy dealer in Wash. about 2 years ago. It
was a long block and Chevy just called it CHEVY 350 300HP HI-PO. The part#
is 12355345. It's in a '42 Chevy pickup. The lifters are hydraulic but we
were looking at a '80's Chiltons Chevy pickup repair manual. It said to
torque the rockers to 40 foot pounds and since this engine looks like the
ones listed that's what we thought what to do. I believe we are very
The adj. NUT is crimped at its top causing a drag / tightness so it can hold
it self. NO TORQUE in needed on the rocker arm nut. What would be the
method used at the factory ??? are the nuts adj while running (NO) are the
nuts adj when the lifters are full of oil??? (NO) they adj. so fast it would
scare you and its by a 1/2 adjusted method when 6 is up turning the engine
over to 1 up to adj. the other 8 nuts and the other 8 are obvious there the
ones not turned down to the proper adj.
Different ways for different people to each there own. I adj. the 6 up to
the 1 up method. If its a re-adj. I bleed-down the lifters for a short time
1st., then un adj. them and find 1 or 6 up then adj for the final time.
Side note... when 1 is up both the in. and ex. are adj. same when 6 is up
the rest of the sequence should be findable in a repair book, its only been
being printed since 1955.
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!
Most books say one turn........... [cc said 1 and a 1/4 turn]
..............[bob said 1/2 turn].........I've seen some do what's
missing..........i.e.: 1/4 turn..........and 3/4 turn......and
1turn.........it has been open to debate as to what is best. Racers (mostly)
use the smaller... like 1/4 to 1/2 its for RPM reasons I've used all the
1/4's and the 1/2's and the 3/4's with everything being ok and never had a
problem and never used more.
I prefer the dry method 1up -6up. Clips seamed to work better than the wire
plastic hole pokers. Cutting the holes in old valve covers had to be cut
just right as to cover the oil splash, tight slit in cover, that and
clips seamed to work the best,(for me doing a running engine).
> the torque spec could be for screwed in rocker studs? The early chevys had
> pressed fit rocker studs. Don't know about the later models. The rocker
> arm nuts are usually adjusted unless there's something I'm not aware of
> which wouldn't be the first time.... I thought that I was wrong once but I
> was mistaken...
No, you were right. We set the lash to zero then just gave it an extra half
turn. Runs great. Thanks.