The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-10-2015, 08:22 PM   #1
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
valve tick and a squeek on new l31 heads

so i just got this thing assembled
010 block
kb pistons
cant remember the cam but 440/420 lift
l31 vortec heads .475 max lift from jegs
lunati 1.5 roller rockers
edelbrock performer rpm vortec intake
1405 carb
ram horn headers
machine shop set up .004 quench
timing is spot on with a stock engine
high flow oil pump

so while my brother was breaking in the cam ( 2000 rpm for 20 minutes is what the shop told us to do) a random tick started happening. shut it down and pulled the covers, rotating by hand could not notice any of the valves behaving badly. started it up without the covers and could not notice and sticking valves. then a squeek sound happened. shut the engine off and now its time to figure out whats going on.
my brother is going to do a compression test after work in the morning to narrow down the cylinder in question. we think its the passenger side only. and this tick only happens at higher rpm. idle is spot on with no weird noises and smooth as can be.
some things that i think might be the problem
-we didnt soak the lifters and its an injured lifter
-timing is slightly off and the valve is bent
-exhaust leak
-defective head from jegs
-calculations were wrong and the cam is too big
-the squeed came from a roller rocker
-voodoo magic and curses

if anyone could throw some pennies at me that would be awesome. need advice and maybe an adult.
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-10-2015, 08:27 PM   #2
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

Heres some pictures
Attached Images
   
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-10-2015, 11:21 PM   #3
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
Re: valve tick and a squeek on new l31 heads

I can help scratch a few things off your list. Every major cam manufacturer advises AGAINST soaking lifters. Its not necessary and will actually screw up making a proper valve adjustment because you cant properly set pre-load if the lifter is full of oil. Timing being slightly off wont bend a valve. The only way to bend of a valve is to hydro-lock the engine or have a piston hit the valve. You would have noticed if either one of those happened. There are other causes but generally its catastrophic and your post would read much differently. Your cam lift wouldn't cause an issue even with dead stock vortecs and as a matter of fact is fairly small. Were the rings set properly. Keith Black pistons are incredibly finicky about ring gap and will snap the ring lands off if gap isn't exactly right. I wouldn't use a Kb Hypereutectic piston in a lawnmower. Any chance you can get the noise on video and post it here? The oil pump or distributor could be squeaking. You could have a poly lock contacting a rocker. Tons of things. How loud is the noise?
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 08-10-2015, 11:58 PM   #4
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

ill see about posting a video tomorrow when i get a chance. hopefully kb doesnt screw my pooch. i had the machine shop gap the rings before i got it back. going to try to find a bore scope for rent and peak into the cylinders if the compression test comes out weird.
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-11-2015, 12:01 AM   #5
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
Re: valve tick and a squeek on new l31 heads

You can probably buy a borescope cheaper than you can rent one.Check Harbor freight and Amaon.com. no clue on quality but here are a bunch of options. Amazon Best Sellers: Best Borescopes Amazon Best Sellers: Best Borescopes
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 08-11-2015, 03:13 PM   #6
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

My brother pulled the valve covers off and took a straight edge to the tops of the valves and they all looked straight. However #2 cylinder intake valve rocker had some wear on it. With full roller rockers is it neccesary to get taller valve covers? Maybe thats where the sound was coming from. He hasnt tested compression yet. Thatll happen later today and i asked for a picture of the rocker.
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-11-2015, 04:50 PM   #7
Tom
driving is in my blood
 
Tom's Avatar
 
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,737
Re: valve tick and a squeek on new l31 heads

A: I agree on KB pistons sucking and B: yes you are supposed to run taller covers with full rollers. I'd be pulling the lifters and checking the cam though myself, I've had what I thought was a header leak [tick tick tick] that ended up being a cam lobe going bad. Did you run break in oil or use a break in additive in the oil? If not that's a problem.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
Tom is offline   Reply With Quote
Old 08-11-2015, 05:27 PM   #8
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

I am using joe gibbs break in oil. 5w30. And a flat tappet break in lube on the cam. I am betting the sounds we heard was the lifters. But were going to double check everything in the valve train again just to be safe.
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-11-2015, 08:18 PM   #9
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

so i dont have a picture yet but the #2 intake valve rocker became misaligned at some point and realigned. could that be from the valve sticking and slack being generated between cam and valve?
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-11-2015, 08:39 PM   #10
cableguy0
Senior Member
 
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
Re: valve tick and a squeek on new l31 heads

I have seen guys not seat the pushrod in the cup of the rocker and do that. Usually though so long as the valves were adjusted properly it wont happen without something breaking.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.
cableguy0 is offline   Reply With Quote
Old 08-12-2015, 12:41 AM   #11
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,250
Re: valve tick and a squeek on new l31 heads

Are you running the correct guided/self-aligning rockers?
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
Captainfab is offline   Reply With Quote
Old 08-12-2015, 07:25 AM   #12
bigmac73
Senior Member
 
bigmac73's Avatar
 
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
Re: valve tick and a squeek on new l31 heads

Quote:
Originally Posted by Captainfab View Post
Are you running the correct guided/self-aligning rockers?
that is true vortec heads need self aligning rockers....
__________________
Mike
72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider.
421 SBC / TH350 3000RPM Stall
Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks
bigmac73 is offline   Reply With Quote
Old 08-12-2015, 03:02 PM   #13
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

LUN-15340-16 these are the rockers im using.
Got some sound clips. Ill try to load them.
Got some pics of the rocker
Attached Images
   
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-12-2015, 05:27 PM   #14
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

https://m.facebook.com/groups/218607...id=20531316728
If this link doesnt work the video is on the facebook page
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Old 08-13-2015, 10:28 AM   #15
twich3136
Registered User
 
twich3136's Avatar
 
Join Date: Oct 2011
Location: salem oregon
Posts: 101
Re: valve tick and a squeek on new l31 heads

http://www.stangtv.com/tech-stories/...t-the-details/

Found this write up and the first paragraph pretty much sounds like my engine. We didnt adjust the distributer at all.
__________________

USMC
SEMPER FI
68 Chevy Longhorn 350/400 factory posi
twich3136 is offline   Reply With Quote
Reply

Bookmarks

Tags
bent, break in, l31, valve, vortec


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:07 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com