is it going to the birds?

[70's Looker]

well well well, everytime my engine is running at idol and under load it sounds like there are birds signing in the engine-around the engine, to me it sounds like a metal beating on metal sound but everyone else thinks it sounds more like exhaust ive changed exhaust gaskets everywhere and still the damn bird sings, has anyone heard of the heaterboxes rusting inside and have it spitting out the sides of the boxes other than pulling the engine out and doing a good old tear down ( there are no traces of metal when i change oil too)

[Hansk]

Lose heads?

[70's Looker]

damn! the one thing i didnt want anyone to ask, i kinda thought it could be that, i had to put a new head on it and kinda guessing that new head has settled now and not tight, im just to lazy to want to pull the engine

[BUSDADDY]

Done a compression test?
What carbs do you have? (some sqeak at idle)
Sure it's a cylinder and not other things that squeak like distributors?
Tried pulling plug wires one at a time and listening for the noise to stop?

Don't pull it until you find the cause.

[70's Looker]

no gauge compression test, but its still hard to turn over my hand, BUT number 4 was lighter then the rest (head i replaced) stock 30pict 1500cc single port, i used a rod and put it on various parts but could not source the sound with it, i think i will most def pull plug wires now never even thought about that! thanks for the tips as well

[Hansk]

Pop the rocker shaft off that side and check if the 4 lower head nuts are lose.