THE HELL's That Sound??

[Troy_Audio]

Hey Guys

I went to get my Dell40's today man are they nice..
But it the tuning session we ran into a few problems..
1) The manifold wont seem to seal
2) when the motor was running it just started knocking back.. like shut that thing off bad..
I looked under the car all was well
it was a steddy knock that sounds very matalic..
The first thing that we will check tomorrow it the valves,then the heads..
Any idea's..
I dont think its a bolt or washer that fell in cuz all parts were acounted for when removed..
Peace Troy
Pic#1) Left Carb --Pic#2) Right Carb & Val Stack--Pic#3)Tin rubbing Manifold Youcan see the burn..