Valvetrain noise after cam swap

[geldartb]

ahh shit asking the hard questions now makin me think

38-40 at idle which is 1k before it was oil pressure about 40-50 at 1200rpm.

theres oil in the pushrods cause when i swapped the non stock back in i stood them on end on the plenum and they dripped oil out .

haven pulled a valve cover when running yet up until recent ive had the heater core metal hardline running infront of the valve cover, which i repalaced with a hose routed away from the valve cover.

FWIW theres oil in the tip of the rocker so there must be something getting up there ill check on friday.

[Superdave]

what spring seats are you using?


I used the stock ones with the Comp 26915 springs, very tight fit and they were noisey for the first few minutes... till the paint wore off. I can still hear the valvetrain noise coming through the firewall while driving, it's way louder then stock.


in the end, the only thing i can think of is the geometry is off somehow.. are you damn sure that's the 1357 grind? Mistakes do happen, did Ben give you a cam card with it?


I know you don't want to take it apart again but maybe putting a dial indicator on both an intake and exhaust lifter and rotating the engine around would give you an idea of the lobe lift. Or pulling the cam and measuring the base circle, i have measurements from my cam, stock and the 1617 grind. You may be able to pull the timing cover and slide the cam out enough to see the 1st lobe and get a measurement w/o pulling the engine.. i'd have to look in the bay of my GAGT to confirm though.

[SappySE107]

Grind # is engraved on the end of each cam along with the LSA.

[geldartb]

no dice unless theres subframe droppage i barely got the engine mount off the cover.

and yeah its a 1357 i took pics off all the shit beforehand.

valvesprings are the comp cams ones from the store here

stock seats and the comp cams locks and keeps ben sells here too.
rest of the shit is stock pre99 timing setup including the guide chain and sprockets all GM parts.


eventually im gonna have to put the hood back on and be depressed im kinda diggin the no hood look. the stock hood is a heavy sob. i forgot to take it off before i had the engine 90% of the way out, was kind of intersting to take off with the engine and hoist in the way

[pocket-rocket]

Geeze man. Every time I see this thread has been posted to by you I hope it's you saying you figured it out, and all is well now. I feel for you man. Having something you put together like that not work right just plain sucks. I wish you lived across town or something so I could come help you out with it.

[gectek]

hey ben how about some worn guides? i had so many problems with valvetrain noise, it turns out the torx bolts that hold the thrust plate on backed out and let the cam walk a little, and one of the rocker arms backed out of the threaded pedestal. it made all sorts of knowledge, that and i think i was running into coil bind with some yellow ls springs too. i havent tried the 26915 springs with my stock 02 seats yet(ben has the heads) but when i get them back, im going to try them out and see if they will make any noise, if they do ill just change to the 26918, or i may go with those to begin with...
just a few personal experiences...

the worn guides would make the valves make noise trying to center in the seat

[SappySE107]

I haven't heard a motor make that sound and I haven't had bad guides on any of my motors yet. Higher lift would make that more noticeable though.

[tractorman]

I don't mean to be trite here... but I'm not about to read through 16 pages. So I'm just gonn ask:

Have you checked how much preload is on the lifters? Actually set up a dial indicator and checked each lifter? 'Cause from what I've read, it seems to me that the valve train is just loose.

Seeings how these valvetrains are non-adjustable, I don't have any ready solutions if this does in fact turn out to be your problem. But it'd be worth checking. Custom-length pushrods are available, and I don't think they're all that expensive.

[SappySE107]

He has custom length pushrods, that are a hair longer than they should be but shouldn't be causing this sound. If they were too long, there would be compression loss from the valves staying open, so I know this isn't the case. He already tried the stock pushrods as well.

[gectek]

to fill you in, he has custom rods for the cam, got them from the store here, and they should have the preload designed into them. Well ben you did see my guides.

Hey geldartb who did you get the heads from?

and ben i wasnt saying you had any bad heads, i meant worn guides like what i had, that would cause valve train issues probably

[SappySE107]

right, im just saying that I haven't heard a setup running with bad guides to know:P

[gectek]

ko, mine mad some hellacious noise, but also because the cam was walking, and the springs were smacking themselves

thats the last time i get caught without locktite

[geldartb]

the heads are stock 05 3400 with like 7k on them. its the engine i originally bought to replace the original engine that got roasted due to intake gasket failure.

i locktighted the torx bolts for the cam holder thing and the rockers are plenty tight trust me.

the springs are def not touching, they were pretty damn close to touching with the yellow ls6 when i was assembling the engine so i went ahead and got the comp cams ones to save myself the headach later on down the road.

the valve seal/seats are the original ones from the 7k motor so they still should be fine.

[gectek]

well its a good thing you did, i didnt and i had to sell the springs for not so much as what i bought them, lost a descent amount of money on that idea...well i hope u can find the problem

[geldartb]

i still got the ls6 springs, never used them but i only paid like 65 bucks for them a few years ago. the only time they have been used was to mount them and take them off.

ive ran out of shit to check other than shelling out 200 bucks for brandy new lifters, which i honestly dont see solving the problem cause i already swapped out lifter with the ls1 springs inside them so the should be better than the stock ones.

ive had the top end off more times than i care to remember.