Reprising old question on 350 carb/intake - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 28th, 15, 09:58 AM Thread Starter
Larry
 
Join Date: Apr 2015
Location: Colorado
Posts: 2
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.
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post #2 of 3 (permalink) Old Apr 28th, 15, 10:22 AM
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Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,749
Smile Re: Reprising old question on 350 carb/intake

Put sealant on those new bolts or studs that you used, so it can't suck air thru the threads.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 3 (permalink) Old Apr 28th, 15, 10:38 AM Thread Starter
Larry
 
Join Date: Apr 2015
Location: Colorado
Posts: 2
Re: Reprising old question on 350 carb/intake

TJS69, I think you're right. Do you think the issue was caused by me drilling into the intake? I did put some RTV on the D/S hole but I don't think I drilled thru anything that would cause a leak with that one. The problem must be the P/S rear hole that went into the intake. Will try that now. THANKS!
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