Quote: pull the intake manifold off and flip upside down. sounds to me like it's cracked on the bottom side. I had a '73 440 New Yorker years ago that did this. I'm trying to figure out how you're keeping it running on 4 cylinders? and still driving down the road? please let me know if you need an intake manifold, as I'm well stocked for poly. my
Intake isnt cracked- Checked it. HOWEVER- I may be contacting you to buy some parts...
Someone suggested that the reason it changed could be seat wear due to using unleaded gas. I'm goign to use some Marvels mystery oil in it for now but think I should buy some extra heads to have hardened seats put into and swap out later.
