I can state that the E Street/RPM casting, in well ported form, without epoxy or welding can support 780+ horsepower using a 451 stroker and 91 octane pump gas.
How much port work do the Edelbrock heads need to match the trick flows OOTB. I know it's likely cheaper to buy the trick flows for the given flow advantage. But can these E Street be made to flow like trick flow later on? Within reason I guess. Yeah I know define reason right. LOL
Flow rates aside--You cannot match the gorgeous chamber on the TF's or there sweet intake valve shape which in large part results in the killer .400"-.500" flowrates. The most flow I have personally achieved with an Eddy 5090 and the stock valve was 298.5cfm @ .600" . With a bunch of other trickery these went on to support 680hp 654tq on a 469BBM though and got us within 4 points of 2nd place in the 2016 EMC. The good ole days. J.Rob
I wish the video was still online where the Comp Cams dyno operator during the contest set his readout screen to a maximum of 600 HP.....because......the previous 451 engines had maxed out in the 580's. After our first pull he turned around and exclaimed to the crowd behind him, "IT WENT OFF MY CHART!" And there it was.......a straight line disappearing off into the wild blue yonder with 600 HP down around 5,400 rpm on a 7,000 rpm screen.
Those are impressive numbers on the eddy heads. So there is a bit of room to grow with them if need be. Nice to have options. They seem to be adequate for many builds.
I have the RPMs for a 451 still in boxes debating what all I am going to do with them before install.
