ls1chris

intalled a tsp torquer v2 cam along with comp cams lifters and tsp 7.400 @.80 pushrods.i have great oil presure at idle is about 38-40 psi and when you go wot it goes to about 45+ .but once the engine is warmed up after a few pases or revs it gets a loud and i mean LOUD knock knock knock.Sound's like a lifter is bleeding down then at idle it will finally pump back up . but at first fireup when it's cold its quiet as a mouse

Ive tightend the rocker arm bolts to 22 alway across the board and everything looks fine.but still a loud nock more than that is associated with a camed ls1. Some ppl say i need different pushrods or perhaps some adjustable rocker arms to get it lined out any input .i need to get this fixed as quick as possible .have to drive it to work this week. if you guys need some more info just ask ill try to provide anything to get help with this

Juiced

iTrader: (2)

i think you spun a rob bearing and have a rod knock.... .

Oil pressure at WOT should be between 65-80 psi, as the oil pressure goes up, the lifter noise should be less.

ls1chris

i dont think i have spuna bearing i car has ran perfect and i just got about 200-300 miles on a complet top end rebuild.and you are right my oil pressure is around that at wot i just put 45 + to show that it is oiling correctly.the car still runs damn strong.like if i go start my car right now and just let it idle for 25-30 mins its quite no noise but once you pull out and get the rpms up as in driving thats when the noise happens but you can let it sit and just idle for a few mins and its back quite again

Unstang

iTrader: (26)

If it is quiet when you start it, it is probably not a rod bearing...
Any idea where the noise is coming from?

ls1chris

sounds like its coming from the lifters but their are new just got them from comp cams.or maybe the pushrods but all of them are new with less than 500 miles on them and easy driving never went past 6200 rpm and only hit that rpm once or twice.

ls1chris

it has to be one of the following either pushrods ,lifters or rocker arms. because thats alli installed with the cam and dual springs.maybe i didnt do somthing i was suppose to when installing one of these parts.is their anything out of the ordinary you have to do to any of these parts when installed that i may have not done . Oiled the lifters up before install and then installed the pushrods 7.4 in then tighten the rockers down to 22

DaddySS

I would start by measuring your preload, make sure that is correct as step one.

ls1chris

what would be the proper preload for stock heads and rockers with 7.4 prs with a 232/234 595 598 cam .im goin to throw everything i know out the window and try to start fresh with your guys info .and recheck everything

ls1chris

bump for the night crowd

85ta383

iTrader: (18)

you need to get a push rod length checker.. you can get it from a sponser or oreillys sells them for 23 bucks but they have to order it too.

good luck

BigBake

I am assuming the heads are stock, and have not been milled, and you have a stock size head gasket also. If so, then those pushrods are too short, you are running a smaller base circle camshaft which requires more pushrod length. Also did you properly follow setting preload by placing #1 to TDC, and then torqueing in accordance with the service manual. That is the best way to achieve proper preload across the board.

BADD SS

iTrader: (4)

I have the same exact problem... just a little more oil pressure. I installled a torquer II and patriot ls6 heads milled to 60 cc, ls7 lifters, and my old 7.4 pushrods. Ran fine at idle, but once it got hot after about 25 minutes, sounds like a super loud lifter tick, that comes and goes. Bought a pushrod length checker, and it says I need 7.35's to achieve proper preload. Im in the process right now of doing the swap, i'll let you know how it works out.

PREDATOR-Z

From what I can gather so far, it seems that the LS7 lifters require shorter push rods. My guess is .050 shorter.

ls1chris

Predator i was hopeing you would read this thread.from what i gather today talking with my father he said that i have enitrely to much preload and its causing the lifter to bottom out .he says i need either shorter pushrods or get some roller rockers to adjust for it..the lifter i installed are comp cam replacement lifters part number 850-16.
and yes they heads are stock with Stock rocker arms . so should i get shorter lifters or get soem roller rockers .what would be the best bet to go

PREDATOR-Z

Reading through your stuff again and the fact that they are 850-16 lifters
(BTW they are unmilled heads/stock gasket right?)
Your p-rods would actualy be too short.

I run the same cam with the same lifters on milled 5.3L (.025) with 7.400

2 things that pop in my mind:
1- The little blue O oil ring
2- Did you clean your lifters (not just oil, but clean) before install.

LS1_TA_2002

Yep

ls1chris

yes they are the stock gaskets and heads,I did not clean them with any mineral spirts i just got them out of the box wiped them down and took some oil and pushed oil threw them untill it cam back out the top of the lifter.I thaught about the oil tube o ring but it has good oil presure around 38-40 psi at idle and its about 50+ at wot..Do you think it may be the fact im using the stock rocker arms and mounting shaft and not running a adjustable rocker arm or jst that the pushrods are to small

LS1_TA_2002

Only one way to be sure...
http://www.compperformancegroupstore...Category_Code=

ls1chris

i got one of the pushrod checkers on order to double check everything .but just still looking for more insight.ive heard so much stuff its hard to belive some.thats why i was curious if running the stock rocker arms would make a difference

JZ28

iTrader: (3)

https://ls1tech.com/forums/generation-iii-internal-engine/669000-fk-n-valve-tick-won-t-go-away-lifter-preload.html

Check out that thread. I am having the exact same problem with my car. Sounds like it might just be the oil pump o-ring.