Valvetrain noise after cam swap

[Superdave]

Yah, that still dosen't sound right. have you pulled the front valve cover while it's running to make sure it's getting plenty of oil to the top end?

[geldartb]

Just a thought, but what locks/retainers are you using with the LT1 springs?

The LT1 springs are inside the lifters , dave posted about them a few pages back there just bigger and the main spring is a little stiffer helps with running larger cams.

im using the comp cams valve spings from the store here.

Yah, that still dosen't sound right. have you pulled the front valve cover while it's running to make sure it's getting plenty of oil to the top end?

not so easy with this the heater core line prevents the valve cover from being removed but i got a way around this.
awhile back i got a setup from a minivan that ran the heater core line around the otherside of the enigne instead of in front of the valve cover.

but its getting around 38-39 psi of oil pressure at idle and you can see the oil flowing up through the oil filler hole.

thats the first thing i checked at startup with the noise was to make sure there was oil pressure.

im gonna see what walmart has for reg generic oil to fluush out the bulshit then once its straightened out go back to synthetic

[Superdave]

hmm...

toss in some slick 50 and see if that helps.. lol

[3400-95-Modified]

I thought if you took the front valve cover off while running you would get oil everywhere...

BUT as far as the lifter goes, measure the height that the lifter is sticking out of the bore, you can see in this pic, I was taking a picture of lifter preload in this one... this is actually stock pushrods with the milzy stage 1 cam, so technically you could use the milzy setup but you just lose GM spec preload.



Using calipers will give you a better measurment since your probably talking about hundreths of an inch or so....

[geldartb]

hmm...

toss in some slick 50 and see if that helps.. lol

i got mystery oil you know the stuff in the red can

i got the 3/16ths with a tape measure and a peice of sheet metal laying flat on the lifter not counting the thickness of the sheetmetal in my measurement.

[3400-95-Modified]

calipers will yeild you a better measurement, since 3/16ths is rather vague... to say the least when it comes to that height

[geldartb]

yeah told you it was my mcgyver measuring skills although i didnt have the paper clip so i coukdnt finish. ill pick up a set of calipers today.

the tapes good for when im cutting wood not engine parts.

[3400-95-Modified]

I measure my cylinder bore with a tape measure ROFL

[geldartb]

yeah thats different.

ok im gettign screwed over by ONE lifter on the number 3 cyl. its not filling up ill have to run downstairs cause i cnat remember whether its intake or exhaust. its the 3rd one in fromt he pass side of the car left side if your standing in front

the rest of the lifters were rock solid. the one i took out is totally collapsed ill post a pic later

Jon knows as well as i do the back 3 are getting plenty of oil as we found out that day.

i got the measurements from my car now i got to get the ones from the old block to compare.

i can honestly say now i can do a lim gasket in like 3 hours prob less now.


ok on to the measurements

.17 inches on the intake 4mm
.18 on the exhaust on my engine with the cam in it. 4.5mm

149mm on the short pushrod
6.1250 on the long 155.57500 millimeters
-------------------------------------------------------------------
6mm on both intake and exhaust from the deck to the top of the lifter.
154 on the long
145 on the short for stock

[3400-95-Modified]

Well....

.236-.17=.066

5.708+.066=5.774=146.6mm short rod

.236-.18=.056

6.062+.056=6.118=155.39mm long rod

so um they could be ever so slightly too long on the intake causing the lifters to never get a chance to pump up... but I'm not a genius on this and I didn't measure it myself... and you jumped back and forth between mm and inches... damn you threw me off there.... I would stick with .000 far in inches its more accurate.

If they are not pumping up, check to see if you get ANY preload with a stock set of pushrods, even if it is just barely any I'm curious to see if that would help and make the noise go away. You can do a stock pushrod test and if you get preload and then put it together and it shuts it up, then you can talk to Ben about getting ones the right length, or ever so slightly shorter than what he gave you, thats an easy swap if that fixes the noise. And remember that lifter started to pump up when we were just running the oil pump so its gotta be something related to preload somehow.

Also correct me if I'm wrong, short rod is intake, long is exhaust right?

[geldartb]

yeah i confused myself on that one too. i went to inches on the longest pushrod from the custom cam cause the caliper i got only went to 6 inches on the ruler part so i added the .2222 to it it didnt go that high in mm.

the rest of the lifters filled up they were pretty solid like with oil.

[geldartb]

still sounds like shit. the noise didnt change after i took the top end off for the 4TH time.

use stock pushrods to see if that helped as in trying to see if the ones i had were a smidge too long no change.

i need more antifreeze to let it run a long time, with the amount of times ive had to take this thing apart the amount of antifreeze is dwindling down.

i did let it run for 5 or so minutes after i found out i forgot to hook the hose up to the pcv valve and was wondering why the car wouldnt stay running. after that was solved it ran good idled solid at 900, revved it up to like 2 or 3k put it in gear to get some load on the engine brought it up to 1.5-2k then let it idle as the oil burned off the head and exhaust cause the stupid valve cover did sinch itself down all the way.

once i get more antifreeze ill try that and some mystery oil for the hell of it. but other than this im kinda annoyed and pissed at the whole thing so if anyone has any brilliant ideas that will help me out please say so cause the car is real close to going buh-bye

[Superdave]

check the checkvalve in that lifter.. it might be stuck or something...

[IsaacHayes]

Uhm. Just drive it till it breaks?

[geldartb]

i replaced the one lifter with another one with the same springs in it, it was one of the 7k original ones which still had clean oil in it.

the rest were all the ones that i swapped the springs in so they got cleaned out good.

the few lifters i took out and took apart the other day were full of oil and everything looked good and normal.