The tiny narrow ass pinch speed doesn't cause separation at that juncture, at least as far as I've ever seen with a pitot or bench results going from stock to around 282cfm @28", but that WAAYYY too fast floor speed created by it just hamstrings the SSR further on down the line.. was what I was getting at with my above comment.E.Roy wrote: ↑Tue Apr 03, 2018 12:13 am Thanks for the input, sounds like I'm on the right course then. I edited my post on you to add this
"On the intake I'm focusing on 3 areas, blending the seat to bowl, narrowing the guide boss to a vane, and taking .100" out at the pushrod pinch because I think stock it gets flow separation."
I could tell there was a lot of swirl action, even the beak in the chamber that shrouds the intake, which I'm grinding to match 45deg seat.
It makes sense to a degree, they were making a truck head with mpg in mind.
Maybe I'll post pics
Eric
Basically, settle down the upstream speeds and you'll have an easier time getting the SSR flow separation under control was the main point. Otherwise you'r left bandaiding the SSR because of that too narrow pinched floor width. You can really only gain so much width in the pinch without going to an offset rocker/pushrod setup so you'll need to get the roof up as high as possible and then push the common walls on either side of the divider as hard as possible. There is no water in the first couple inches so you can go deep on both sides/ports until there's barely any divider left. If you use the OEM improved metal gasket(aluminum IIRC, that divider can easily be whittled down to around .080" without worry for losing the gasket during torquedown or over longer term heat cycling. You can go even narrower than that if longevity is not a key concern too. Think my last set went downwards of around .060" and still sealed up with the modified gasket just fine. Good luck with it.