cdeal28078 wrote:Are you sure you have adjustable rocker arms? What year 302 is it? Tight against the valves and a 1/2 turn more? I don't understand what you did yet. What year 302 did you get rebuilt? Can you post a picture of your rocker arms? That would help a lot
If you DO have adjustable rockers, did you make sure the lifters were pumped up fully? Did you rotate the engine so that each of the lifters was on the bottom side of the cam lobe before adjusting?
If you have adjustable rockers, the "zero lash plus 1/2 turn" will work. I've always just tightened them an extra 1/4 turn on SBF engines.
Back in '74, I was working for a GMC dealer, and we had a TON of top-end failures on 454's. Through some research, we found that the rockers on those required a full turn past zero lash to center the plunger in the bore to provide the proper lubrication through the push rod and rocker arms.
Wise men talk because they have something to say; fools talk because they have to say something.--Plato
Why is it that there's seldom time to fix it right the first time, but there's always time to fix it right the second time???That's not an oil leak That's SWEAT from all that HORSEPOWER!!