BG carb choice
02-14-2005, 11:34 AM
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BG carb choice
I have a sbc 350 ported vortec heads powerflow plus intake crane cam 104124 214 degrees intake duration @.050 and imco exhaust. Currently runing quadrajet - want to switch to BG sea demon or mightymarine demon - I am running at 5000 feet above sealevel. What carb would you reccomend - sea demon ar mighty marine demon and what cfm????
THanks so much for the help
THanks so much for the help
02-14-2005, 03:27 PM
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Re: BG carb choice
A 650 Vacuum Secondary Speed Demon "Marine" carburetor would be your best choice. P/N 1282010VEM. You'll need to either switch intake manifolds, or use an adapter, since our carburetors use a square flange bolt pattern.
02-14-2005, 04:24 PM
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Re: BG carb choice
Thanks Rum Runner,
I know you speak highly of these carbs. I have the adaptor for now but am going to switch to a performer rpm air gap down the road
What is the adv. of the vacume sec. and what is the difference betw. speed demon and mighty marine demon?
DO I also need a new fuel pump?(currently stock mercruiser mechanical pump)
Thanks again
I know you speak highly of these carbs. I have the adaptor for now but am going to switch to a performer rpm air gap down the road
What is the adv. of the vacume sec. and what is the difference betw. speed demon and mighty marine demon?
DO I also need a new fuel pump?(currently stock mercruiser mechanical pump)
Thanks again
02-15-2005, 04:31 PM
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Re: BG carb choice
Originally Posted by fulloblarney
Thanks Rum Runner,
I know you speak highly of these carbs. I have the adaptor for now but am going to switch to a performer rpm air gap down the road. The Square flange intake will perform better.
What is the adv. of the vacume sec. and what is the difference betw. speed demon and mighty marine demon? The vacuum secondary carburetor will give you better throttle response, let you get on plane quicker, and allow you to run cleaner at cruise. The Speed Demon "Marine" Carburetors are designed for milder engines like yours, and have an electric choke for easier starting, while the Mighty Demon Marine Carburetors are designed for more Radical engines.
DO I also need a new fuel pump?(currently stock mercruiser mechanical pump) No,your stock pump should work fine.
Thanks again
I know you speak highly of these carbs. I have the adaptor for now but am going to switch to a performer rpm air gap down the road. The Square flange intake will perform better.
What is the adv. of the vacume sec. and what is the difference betw. speed demon and mighty marine demon? The vacuum secondary carburetor will give you better throttle response, let you get on plane quicker, and allow you to run cleaner at cruise. The Speed Demon "Marine" Carburetors are designed for milder engines like yours, and have an electric choke for easier starting, while the Mighty Demon Marine Carburetors are designed for more Radical engines.
DO I also need a new fuel pump?(currently stock mercruiser mechanical pump) No,your stock pump should work fine.
Thanks again
Doug
