Reprising old question on 350 carb/intake
Hi everyone. I have a question, and maybe an answer, to an old questioned asked here in 2008. The Thread was titled '1975 Chevy 350 intake manifold 2bbl carb mounted with 2 bolts'.
No one seemed to know why it was made that way- tho some thot it was GM trying to save money.
I have that same intake. My carb gasket was leaking, it is at least 15 years old, so I decided to check things out. Once I had removed the carb I realized I had done this years before. I decided to drill and tap the 2 missing holes (instead of simply buying a new gasket- which I sure wish I had done now). Once I drilled/tapped and reconnected the carb the engine runs like it is missing.
My question is, could drilling/tapping those two holes have caused this? One of the holes, the P/S rear, is about 1/4 inch thick and, once drilled, enters the intake chamber. The other one, D/S front, doesn't. Thanks for any advice you can give or any fixes to this frustrating problem.