it sounds like a lifter, but i could be wrong. they were set at 0 lash with the engine out of the car. just installed world heads and slp headers and the "ticking" persists even when warmed up. from under the car, it sounds like it's hitting the transmission oil pan, from under the hood, it sounds like cylinder 7 or 8. Could something be coming from the tranny? the noise intensifies when giving it gas. thanks in advance.

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86 305 TPI
700R4
3:42 axle
4 wheel disc
-Summit cam .442" lift
-Summit chain/roller
-Summit tranny cooler
-WORLD S/R Torquer 305 heads w/ LT1 springs
-High pressure oil pump
-Hypertech Airfoil
-SLP 1 5/8" headers
-CatCo cat.
-Flowmaster 80 series c/b
-Taylor Spiro-Pro 8mm
-Bosch Plat. plugs "hot"
-Indexed plugs
-K&N Air filters
-Trans-Go shift kit
-Removed AIR
-180 Thermostat
-T/B coolant Bypass
-All sensors replaced
-Custom Ram-Air
-Poly motor mounts
-Manual fan switch
-Newly Lowered!!!
Eibach Sportlines.

soon...
125 shot, slp runners, perf. chip, ported plenum
https://www.thirdgen.org/rides/index.tgo?action=view&rideid=6820.

 

Maybe a misadjusted rocker arm??

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89 RS
STILL Looking For:
An 87 IROC-Z28 350 TPI

Yeah I have an RS, but I want an IROC-Z!!

 

yea i would check the rocker arm.. mine did the same thing..

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91z28 350tpi auto, runs 14.3... aim screen name nice3rdgenz

 

Not sure if it's possible, but I've seen it on diesels before. Sometimes when pressure is let off of the lifter it will overextend so to speak. Naturally you get a valve hitting the piston, which usually causes a spun bearing. Check your valve lash again like the other guys suggested.

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'87GTA w/ SLP Cold Air, MSD Coil, Airfoil, Gutted MAF, AFPR, TES Headers, HI-FLOW CAT, Flowmaster Catback, Energy Suspension Master Bushing Kit

 

could also be a small exhaust leak...you say you just installed hedders. Also...definetly readjust rocker arms

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Alex A. (aka chevyboy)
1992 Z-28 L98/1LE. Heritage Edition. SLP runners, gutted cats, SLP 3" cat-back & muffler. 3" flo-tech cut-out, SLP TB foil, K&N filter @ TB, 3.23 posi rear.

 

I say check the headers for a leak. They will make a tick thats sounds like a lifter.

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1992 Camaro Z-28 custom 25th anniversary, 5.7 TPI auto, 2.73 posi, t-tops, arctic white with 92' medium mettalic gray stripes with black border stripe.

1967 Pontiac Catalina 2 door fastback, 400 v-8, auto, cameo white, dark red interior

1987 Olds Cutlass, 350 Rocket, auto, dark gray/light gray interior

 

My SLP headers tick real lightly on the driver side, sompe of those rear bolts are a real bear to get tight.

I agree with Rod

John

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G O D BLESS AMERICA

http://www.3rdgenformula.com

87 Formula 5.1 TPI Auto Modified (Yellow/Black)
87 Formula TPI (5 Speed) Yellow/Gray STOCK
14.8sec 1967 Buick Riviera
1990 Buick Riviera
83 Camaro
83 T/A

 

Rocker arms should be adjusted 1/2-1 turn past zero lash. Sounds like that's your problem. Also, could be a rocker arm nut loosening up. My 86' IROC had a nut that kept loosening up on the #6 cylinder.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

Yeah, sounds liek you need an educated ear to tell you if it's a header gasket leak or a valve or two set wrong (or perhaps something compley unrelated, you never know.)
Considering the mods you just did, those are your likely culprits. Are you sure you set the valves correctly? TAGTA350 is right, they are supposed to be set 1/2-1 turn past zero lash, where zero lash is the point of no play in the pushrod (but before you start compressing the lifter.) If this was your first time setting valves i'd bet a $ this is your problem, it's easy to screw up your first time, i did. Luckily i didn't kill the cam. I went to one trunk past a compressed lifter. Needless to say, that engine made funny noises.

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.7 @ 93.6
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

it isn't a rocker arm. i was going to get under the car for closer inspection but couldn't get the jack underneath because of it being lowered. there are a few spots from the y-pipe to cat that weren't welded completely closed at the top. yet it still sounds like it's coming from the tranny oil pan. i doubt a leak would sound like this. something is hitting.

 

my friend just recommended adding slick 50. think this would help?

 

Have you done anything with the transmission or torque converter? Does the noise hang around while you rev up the motor?? Check to see if the torque converter is tight against the flywheel. This will cause a ticking sound if its loose. I had this problem on mine so I put a washer to act as a spacer between the converter and flywheel. It completely took care of the problem. Its just something that could be checked pretty easily by taking of the flywheel/converter cover and checking the bolts.

 

yes, if i slowly open up throttle, i can tell the noise gets louder. when i did the head swap, the engine was pulled with the tranny. Pretty sure everything was put together just the same it was pulled apart. It doesn't really sound like something banging around. It's much more consistent.