I'm confused EO/IC
 

Hey guys, I'm hoping someone can give me some insite on this matter. I have a 2001 T/A WS6 M6 w/60k. Comps cam XFI 218/224 .528/.535 , Brain tooley springs,7.4 hardened Pushrods,Hardland sharp roller rockers, and stock lifters & heads. And yes my cam has the smaller base circle. I put together my motor and had it tuned by Andrew @CompleteStreetPerformance. Car made 396HP/396TQ and ran great for 3k miles. It had normal sewing machine valve train noise.

Now it developed a hollow tap. So I pulled my rockers and reseated them. I know it is possible I had a lifter collapsed but I decided to recheck my preload. When I originally put everything together useing EO/IC method w/ a known pushrod length the 7.4s I got 7 1/4 turnsfrom zero lash. Putting me at 1 3/4 turns to 22ftlb. Now I'm at a little over 1 3/4 turns.

When I originally put the motor together I read some of the stickies and followed the how to. Which stated that anything between 1-2 full turns is OK. Now I went back thru the stickies and some say that you are supposed to minus 1/3 - 1/2 turn and should be at 1 1/4 -1 1/2 full turns. With no gap between rocker arm and valve at zero lash. If this is correct my PRs mite be to short, Now I do have some gap from my roller to valve stem and at TDC I can spin my PRs but there is no wiggle to them when torqued to 22Ftlbs.

Can someone please take me to school on this matter??

" Your winkle motor doesn't make the world go around, its the torque from our LS motors " :nutkick:

2001 T/A WS6 M6 - comp cam 218/224, 7.4 Hardened PR, Brian tooley springs, Powerbond 25%UD, Pacesetter LT & Y, SLP Lid/MAF/LM1 exhaust. 396HP 396TQ

Best bet is to buy 8"+ digital calipers and measure the adjustable pushrod, rather than counting turns. I practiced on several cylinders before actually starting to make sure I was getting consistent results. I'll find the thread I used from Darth v8r.

https://ls1tech.com/forums/generatio...od-length.html

I didn't use TDC or EO/IC, just made sure both lifters were on the base circle of the cam and you can do them both before moving to the next cylinder.

Thanks for the replies, I appreciate it. What was the final results for you useing the calipers ( valve train noise)??

No noise with aggressive lobes and the proper length pushrods. Same cam with standard 7.4 rods sounded like a sewing machine.

That's how mine sounded. But now I'm worried I have a collapsed lifter :( . I plan on putting the stock rockers on first and open my valley cover to make sure no damage done to my cam.

Good idea. I thought one of my brand new Morel lifters was collapsed cuz it wouldn't give at all when I pushed the posh rod by hand, while others did give a little. After doing the measurement from zero lash in the write up, I found it was all good. Good luck man!