i have a 93 z28 with the LE1 head/cam package and im still trying to get all of the bugs worked out. after getting ignition issues straigt, i had my valves tightened to 1/8th past 0 lash and the car ran well except for a slight miss on bottom end, but the valves were extremely noisy (i also have 1.6rr's if it matters) so i thought they were too loose. then i tightened them down to 1/4 and they werent as noisy but i lost a lot of vacuum and power. it also made the car run very rich, i assume because of the low vacuum. my question is should i go back to running the car with loud valves adjusted at 1/8th past 0 and will this damage anything, or do i need aftermarket lifters for this to work properly with this setup. if so which ones. this is going to be a daily driver with occasional track use.

 

Some RR's will always be noisy, like Pro Mags. Crane makes some really quiet ones. If I were you, I would measure the vacuum level at your current setting and return them to 1/8 and measure it again. No matter what, put it were the engine preforms the best, regardless of noise. I would stick with OE lifters. Have you also checked the pushrod length?
http://compcams.com/Technical/Products/Pushrods/

Dave

 

my pushrods are 7.2 inches. thats what lloyd said i should get. i was just wondering why i shoud stick with oem lifters..........thats fine with me, is saves me time and money, but a lot of people have said 1/8 past zero is way too loose on stock lifters.

 

someone, anyone?

 

What answer are you looking for? If 1/8 is ok? Well typical is 1/2 turn but you could always do the adjustment with the running method. If your vacuum level is dropping when you adjust the valves so they are not noisy then that is probably typical of that cams level of vacuum.

What I'm having trouble understanding is you put new heads and cam and used stock length pushrods because someone said to and it appears you didn't even bother to check the length? It's something you can do with the naked eye. You don't need tools unless the rocker isn't moving like it should across the end of the valve.

Another thing, what is the spring pressure of the new setup? How much higher than stock is it and could that have an influence on the lifters noise level?