SOLVED! 318 2500-3000 rpm idling issue. Don't think its a regular vacuum leak. Swapped 2 intakes, 2 carbs ,and 6 different gaskets still no luck.
Holley Dominator for small block, large port mopar, is a Spread Bore intake that causes interference with the Square Bore carburetor butterflies.
They need to be machined out or get a Spread Bore to Square Bore adapter to allow them to work right.
You being a Pontiac Guy, you probably think the spread bore intake is the proper one.
Not for the square bore carbs.
You will probably see the butterfly witness marks at the spread bore opening when you pull the carb off. (Keeping the butterflies from fully closing)
.
Holley Dominator for small block, large port mopar, is a Spread Bore intake that causes interference with the Square Bore carburetor butterflies.
They need to be machined out or get a Spread Bore to Square Bore adapter to allow them to work right.
You being a Pontiac Guy, you probably think the spread bore intake is the proper one.
Not for the square bore carbs.
You will probably see the butterfly witness marks at the spread bore opening when you pull the carb off. (Keeping the butterflies from fully closing)
.