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I got a question. I just installed a 390 Holley carb on a spreadbore manifold and i was wondering about the E.G.R. The E.G.R. valve interferes with the carb body so it had to go. I didn't go with a block off plate but i did get rid of the diaphram housing and gutted the valve. This way i have a soild base to anchor back to the manifold. I was able to seal the valve port but im not too sure about the 2 smaller holes that are on the underside of the base. I didn't think that they passed thru to the intake side but i question this because i cant get the motor to idle down below 800 RPM. If anyone has any input on this i would gladly like to hear it Thanks...

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Also, i've disconnected the throttle cable to insure that it isn't holding the throttle plates open. It has all new hoses and fittings to make sure that they dont leak air. I've checked the secondaries to see if they're closed at idle.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

hey! glad you finally got that carb.
email me you got the address

I think that autozone or pep boyz sells a block off plate. it wouldn't hurt to call and ask.
the holes in the EGR are for the diaphram to actuate. you might want to spray some carb cleaner on the EGR housing to see if you have a vacuume leak.
on some holleys you can adjust the idle using the secondary throttle plates. you might want to look and make sure yours doesn't have an adjustment. I had a 390 on my 3.8, but can't remember if it had that adjustment.
I would also say to check the idle screw, idle mixture and the float bowl fuel level.

hope this helps

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03Cobra

I adjusted the secondary idle screw and it seemed to help some. But is isn't quite right yet. I should be able to turn the primary idle screw out to the point that the motor will die but thats not happening. I sprayed carb cleaner everywhere to try and locate any leaks but it didn't phase it.
Also, i think i need to change my secondary diaphram spring because i dont think the secondaries are comming in to play no matter how hard i get on it.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.