kidcourier (2/15/2012)
......A couple more questions: #1- Edelbrock #254 Early/small ports and #257 later/large ports? Yes. And the #255 has intermediate sized ports.
#2-Does the manifold "Brand" dictate carb direction-sideways or inline? #3-Looking at the carb base,why does one have 4-holes straight down and the other have 2 that are connected and 2 straight down?Any advantages to these designs? Hope I didn't confuse anyone on this description(LOL) ,really looking forward to the dualquad comparison and taking the best carbs/manifold against John's dual plane/carb combo for both street/strip comparison.Again,thank you for the info it's a learning process for me! KID
I’m not aware of any cast Y-Block dual quad manifolds that were originally designed to turn the carbs sideways. All the above pictured intakes use some form of carb adapter to allow the use of later model carbs and orientate the carbs as desired. The Ford ECG-D 2X4 manifolds for the YBlocks allowed the carbs to face forward on the Ford cars but on the Thunderbirds, the carbs faced rearward using the same intake. Where the carbs faced rearward, a bellcrank was used in which to get the accelerator linkage working correctly.As far as the holes at the carb base in the manifolds, that’s just the various manufacturers doing what they thought was either best for performance or simplest to cast. The dual quad intakes cast for Ford would appear to have a preference for the opposing corner throttle holes to be linked. This was at least the case up until the 427 HiRisers came to the forefront at which point Ford went parallel with the carb holes at the flange. Most aftermarket intakes had their shared holes running parallel on the left and right sides of the intake. Here are a pics of some YBlock 2X4 intakes.
