help on dual quad manifold request

[My427stang]

I do know a bit about Edel heads, the info you are posting just surprised me.

I personally own Edelbrock 428 heads on (72 cc / dual exhaust bolt pattern) and run them on my 489, and have had my hands on or installed 3 other sets in the past year on FEs alone. Edelbrock intake ports ARE dimensionally med risers, but like I said if there is a type of Edelbrocks I havent seen (one that came out recently), I will accept it, but I havent seen one yet that isnt designed around a med riser port and for reference the 1247 Felpro gasket size (med riser).

I also went looking before I originally posted, and after, and still havent found any documentation of a different Edelbrock intake port. Quite the opposite actually, everywhere I look I dont see any indication of any port options and I have never seen it. Matter of fact, their 76 cc says low/med riser it is in fact their original head that they came out with and that does have med riser port location. I think they call it a low riser because all low riser intakes will physically bolt up to a med riser. The reverse is not always true, some med riser intakes wont seal at the bottom of the port with a factory low riser head

Although you are right, original med risers have a machined combustion chamber, the port location and size is what makes it a med riser "port" and thats what applies here to his intake manifold choice. If you have something you can link here to show a different intake port on the various Edel heads, I'd be interested, but on Edels site all I found was what I posted originally, every Edel version has a 170cc intake port and uses the same gasket. Although that doesnt prove its the exact same intake port, that with my experience makes me yearn for something more for proof. If there are different ports, I'd like to get some on a flow bench to see the differences.

BTW I am not saying the Edels are 100% copies of a Ford med riser head, they just have med riser intake port location and size (unless of course, there is some "new" Edelbrock head that I have missed) at the gasket, they actually are dimensionally different through the port and bowl area, and thats a good thing too

Original Ford intake ports come in 4 designs not counting SOHC and TP (just the rectangulars ones)

1 - Low riser (original taller but less efficient port)
2 - med riser (1247 gasket, raised port)
3 - high riser
4 - emissions port / 390GT / 70's truck heads (1967 on, C7AE-A, C8AE-H,D2) located on the head like a med riser port but slightly narrower. Exhaust port is later design I think thats what you refer to as the "short low riser" Generally, we dont refer to those as low risers but as GT, or emissions heads

Like I said, I am not sure what you exactly mean, but I have not seen one Edelbrock head that didnt use the med riser style intake port. I am in no way "calling you out" but if there is a new head, I am very interested in seeing what it does, and I havent seen any of the Edels with any difference in intake port design, the only differences I see are changes in: chamber, exhaust bolt holes, and valve size

I will call the Edel techs and post back, I have a contact in the R&D area that I used when we did some changes on my RPM intake. I'll let you know what he says. Regardless, the intake will work, it just wont be a perfect port match

I'll also add, you "could" port match it, but cutting on the floor and blending to the short side turn actually could decrease flow, I wouldnt recommend it. The med riser design is a better port, even when coupled to the mismatch of a low riser dual quad