zrater

if i rotate the cranks 90 dergrees to hold valves up will they still
drop down on me or will the piston hold them up, 2002 z28 140.000m..

SScott236

stick something in the cylinder and rotate the crank, when you feel it hit its close to the top.the valves will drop a little though

zrater

thanks what would be safe to put in there,,older soft electric cord maby.
any suggestions thanks,

Gauge

iTrader: (3)

I used a long piece of heatshrink when doing this. However, I found the LS1HowTo article to be very informative on an easier way of doing it. If you look at the dot on the crank timing gear you can tell which pistons are at TDC. Check out the article and look under the "Top Dead Center Method" section under option B.

Of course, this is assuming that you also have the front cover off. If not, disregard this post.

SScott236

Yea I would think electrical cord would be fine

Blk97WS6

iTrader: (19)

electrical cord, a straw, or anything thats not going to break off. check out the LS1howto guide posted above. that will give you the cam and crank gear locations, and also tell you what pistons are at TDC.
when i did my valve springs, the TDC method worked great for all cylinders but #8 all the way in the back on the passenger side. the valve will fall a VERY little bit without compressed air, but the little bit makes a huge difference.
Good luck

gillbot

iTrader: (27)

I used the TDC method multiple times and never put anything into the spark plug holes. I just let the valves fall a little and never had an issue.

eallanboggs

iTrader: (1)

Go to a Chinese resturant. Order dinner. When finished put the chopsticks in your pocket on the way out the door. Now you figure out what to do with the chopsticks.