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Old 07-14-2005, 11:01 PM
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Best dual 4's for our 428?

This summer fall, we are going to begin prepping the 428 for the mustang. The intake that came with our engine is a mediocre single plane 390 manifold, so that's going to go. We are going to get a new 2 x 4 manifold, (what's a hot rod without multiple carburation ) and planned on using a set of new holley 600's. Mostly the holleys for a more authentic look.

The only 2 x 4 car I had years ago, ran 2 carter 625's in line. Before we get the holley's, I wanted to get a little feedback on other possible carb, options, what are your experinces with multiple carbs?
thx

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Old 07-15-2005, 06:12 AM
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2 x 4 Carbs

Which intake are you going to use? What other modifications have you made to the engine?
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Old 07-15-2005, 10:23 PM
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We are going to use the new blue thunder intake, dual plane medium rise manifold. Essentially an updated (improved) version of the 2x4 manifold that shelby used in 67.

Other mods, we are using the edelbrock aluminum heads, hydraulic 0-5500 rpm cam, roller tip rockers, headers, windage tray. The car will be used primarily for cruising, car shows, likely not too much 1/4 mile racing.
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Old 07-16-2005, 07:20 AM
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What compression ratio is the engine going to be?

Do you know the specs on the cam you're planning on using?
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Old 07-16-2005, 11:05 AM
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We bought the engine with 7000 miles on a rebuild. One of the heads had a crack on the exhaust flange so both heads have been off. The pistons are stock cast 10.5 to 1. I was told that the current cam is an RV cam. If we change it, it will likely be another hydraulic street cam, that can get us through emmissions with no problems.
I know that the engine did go through emmissions as is, so 60% chance that we won't change the cam, in the 1st year.
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Old 07-16-2005, 12:28 PM
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With 10.5 to compression I'd go with a pair of 525 Road Demon Jr. carburetors.
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Old 07-16-2005, 12:35 PM
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Quote:
planned on using a set of new holley 600's. Mostly the holleys for a more authentic look.
I had a 1967 SHELBY GT-500 and believe me the intake system was *****in'...
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