sputnik 440
Capt Jim
I just rebuilt the valve train (did not remove valves). The cam is new, but is the same one from Comp Cam that I took out. All the components are Comp Cam. Bottom line is that I cannot get the power I had before the change, even when I had 5 broken lifters and nearly all pushrods worn at different lengths and the springs rubbing on the roller rockers, as were the cups on the pushrods. That's history. Here is my problem.
I have adjusted the valves at 0 lash and added 1/2 turn on three occasions. I keep hearing the chatter on one or possible two sets of pushrods ONLY when I accelerate hard. I almost sounds like cheap gas pinging, but I filled up with 91 and some octane booster, no alcohol. Same thing. So, I brought the 440 (+.040) in and checked the lash. About 6 out of 8 sets were loose. Not real loose, but at 0 lash or slightly looser. This I did 3 times. My torque should be fine. The locking nuts all seem to work as they should and require reasonable torque to loosen. I have set the 0 lash cold and hot. No apparent difference. There are three ways that I know how to establish the point at which the lash is set. The method I used was to start with #1 and sequence adjustments according to firing order. I chose to determine the set point when the intake valve just closed.
I know I have work to do on a small vacuum leak where a bolt on the intake stripped and will not torque all the way. (I am fixing it with a heli coil) The timing needs to be set a little better. It is advanced a little too much (can't tell you how much til I get a new tape on the balancer). The 4150 850 Holley seems to be adjusted ok. I have great idle and does not miss going through the gears unless I get on it. Then chatter and low power. I should mention it has a MSD electronic system with 8546 distributor. I also set the Champions J14Ys at .040.
Any suggestions or cures??
I have adjusted the valves at 0 lash and added 1/2 turn on three occasions. I keep hearing the chatter on one or possible two sets of pushrods ONLY when I accelerate hard. I almost sounds like cheap gas pinging, but I filled up with 91 and some octane booster, no alcohol. Same thing. So, I brought the 440 (+.040) in and checked the lash. About 6 out of 8 sets were loose. Not real loose, but at 0 lash or slightly looser. This I did 3 times. My torque should be fine. The locking nuts all seem to work as they should and require reasonable torque to loosen. I have set the 0 lash cold and hot. No apparent difference. There are three ways that I know how to establish the point at which the lash is set. The method I used was to start with #1 and sequence adjustments according to firing order. I chose to determine the set point when the intake valve just closed.
I know I have work to do on a small vacuum leak where a bolt on the intake stripped and will not torque all the way. (I am fixing it with a heli coil) The timing needs to be set a little better. It is advanced a little too much (can't tell you how much til I get a new tape on the balancer). The 4150 850 Holley seems to be adjusted ok. I have great idle and does not miss going through the gears unless I get on it. Then chatter and low power. I should mention it has a MSD electronic system with 8546 distributor. I also set the Champions J14Ys at .040.
Any suggestions or cures??