Knocking noise after intake install

[DARK-5.0]

I got a buddy that installed gt-40 intakes on his 95 gt. Well I was only there for a short period and was just checking over things. He stuffed all the head ports in the heads and everything. Pulled them, vaccumed the ports, everything was clear. Well he started it a couple days later and had a knocking noise. I can't figure it out for the life of me. It sounds like its in the valvetrain because it increases with the revs. But what would cause a knock after just intake installs. Timing is perfect and everything.

What do you guys think could have happened??

Jeremy

 

[S/CBlack95GT]

Did he leave a tool in the lifter valley?

 

[DARK-5.0]

I actually thought about that because thats how stumped I was. So next weekend he is gonna pull the intakes back off. We checked for exhaust leaks, pulled the valve covers to see if a rocker came loose, everything. So its gotta be something in the lifter valley.

Jeremy

 

[Dan95-5.0]

i remember when i worked at an engine machine shop, a customer left a beer can in the valley of his SBC. lets just say it didnt last long. and it wasnt pretty. LOL

we all had a good laugh at his expense. Oh those good old days LOL

 

[slvrbullit302]

I have left a wrench in there before but didnt make any type of noise.

 

[black945.0]

maybe a stuck lifter or over tightened rocker

 

[mytight95]

overtightened rocker make those kinds of noises?????

 

[DARK-5.0]

hes never taken off the valve cover until we did to see if the rocker was loose. everything is set at factory specs. all we did was replace the intakes.

Jeremy

 

[94TURBO5 O]

Yep all it takes is one 12mm socket or a nut fall into the intake ports of the lower.

 

[DARK-5.0]

but all the head ports and everything were stuffed with papertowels, theres no way anything got past that. and the motor still runs smooth. I've personally bent an intake valve and it does not run smooth when its stuck open.

Jeremy

 

[94TURBO5 O]

Hmmm, so it's sounds like it coming from under the vc's? Can you describe the knocking sound meaning tapping sound, heavy knocking/clunking?