i want to get a holley. right now i have a stock 12a and an intake manifold from australia i got off ebay just sitting in my room. do i have to install a higher volume fuel pump at the same time? does it matter if get a 2 barrel or 4, im not really sure of the difference...recommendations appreciated
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If it's a 4 barrel manifold you want a 4 bbl carb. Don't be misled by CFM ratings of 2 vs 4 bbl carbs. 4 bbl's are flowed at 1.5" vacuum; 2 bbl's are flow at 3". So a 500 CFM 4 bbl outflows a 500 CFM 2bbl by about 40%.
Your stock fuel pump won't supply appropriate pressure for a Holley - you want 6 psi (and more volume capacity than the stock pump). Are you sure it's a Holley manifold? I thought the Aussies were more into Webers. |
i have no idea what kind it is, i have pics i juist need to scan them
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it would probably help if you told us what type of intake it is.
anyway, either way, you are bvound to benefit from from an upgraded intake/fuel system over stock. |
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