BORE SHROUDING TEST: 4.03" vs 3.91" Edelbrock RPM Heads Really Fit a 318? Project Mission Impossible

I was disappointed after watching the video .

Not because of the results, but because of the way it was done .
I had anticipated the bore being sleeved down with a real insert,, not a big ring of tape .
And then to have a notch cut out of the tape reminiscent of something from the Slate Rock and Gravel company .
I turned it off after that .
That was not a real test in my opinion !
Yes,,,All of the OEMs relieved bores in the past to increase flow ,(usually to clear the valves really ).
But any backyard guy can relieve an iron bore by hand much smoother .
And all of the flowbench guys know that sharp or abrupt corners kill flow .


Those look like good heads,,,but I still think an overbored 318 with a judicious bore notch would flow very close to the larger sized baseline .

Of course,,,I love the 340 as well and most here Poo-Poo on that also .
Lol

Still really good heads in my opinion for the money,,but we already knew that before the video .

By the way .
The S R & G company was the quarry where Fred Flintstone worked .

Tommy