Ok guys so here's the story i went down to a buddys shop of mine yesterday to swap out intakes from a stocker to a ls6 after the reinstall we went to fire the car and and all of a sudden this loud knocking sound stared to happen we shut the car off right then n there took the intake back off and inspected everything, made sure a valve wasn't bent or nothing was inside bouncing around that mabie i had dropped inside but when we did finish inspecting nothing was there so i put it back on and get ready to fire it up again and I'm nervous as hell thinking i magically spun a rod or something just sitting there and have to tow my car home...... So i fired it up and BOOM!!!!! lol jk.....but we fired it up and the knock wasn't there anymore.. ..has this happen to anyone before?

 

Wish I knew what that knock sound sounded like. Definitely a strange phenomena.

 

freaky.. i had a mustang with a built 351w and one night i parked it came out the next morning went to go to work and it was running like crap and had no oil pressure. long story short it broke a rocker arm stud replaced it and everything was fine lol.

 

My car runs fine now but i was very nervous being its my DD, i just bought the car, & and i was 40 minutes away from home... Its really strange that it did that tho.

 

Maybe it was a bad case of piston slap. Idk these cars are known for that. Mine is worse sometimes for some reason

 

You probably dropped a piece of carbon or debris into the intake port and the motor passed it. Did you give the intake a good shake and a hard look inside? Most of a piston can end up inside there if that intake came from a blown motor.

 

Yea i even put a shirt over the intake ports to make sure nothig fell in but i simply dont know What happen im just glad that it was nothing serious

 

did the knocking change with rpm? if not mine did that after my ls6 intake install and it was just the evap solenoid clicking...it went away

 

Well when we started it we didnt rev it we shut it off right away and took it off to inspect

 

hm well if its gone now i wouldnt be too concerned unless it comes back