quote:Originally posted by ttam23:
what hp gains (if any) can i expect from changing out the stock carb and manifold with a Edelbrock 2665 Performer 351-4V and a summit racing 750 carb. all other parts stock on a 1972 pre-L . From what i read on the mustang forums http://www.7173mustangs.com/th...brock-intake-351c-4v it looks like i should just keep the stock intake any thought?
That Edelbrock is not the way to go. The Forums are correct. The stock manifold is better.
The Ford aluminum manifold is the same casting as the iron manifold. It just looses the weight of the iron, AND if you live in a climate where it gets cold and has a real winter, under about 40 degrees it starts to freeze up the carb WHILE you are driving the car.
The iron manifold doesn't have that problem.
You could pick up about 10 hp with a Holley 750 mechanical secondary carb, i.e., a "double pumper". 4779.
Be aware though that out of the box it has a heavy idle. Heavy enough to smart your eyes...and everyone else's too.
You need to go to the level of at least a Boss 351 to be able to use it.
Personally I think on a stock hydraulic cammed 4v/cj all you need is a Holley 1850, 600 cfm carb.
A 750, i.e., a 3310, won't do anything but use more gas.