rewguy wrote: ↑Thu Dec 26, 2019 12:36 pm
Or since the heads flow decent air, and it has a decent converter in it.....a single plane
I don't really think you should pick the intake by flow. Pick an intake that will support the rpm range the rest of the combo will make power at.
rewguy wrote: ↑Thu Dec 26, 2019 12:36 pm I'd hate to cripple a Decent cylinder head with a dual plane, if the dual planes only advantage was below 4500 rpm. Plan on shifting about 6300-6500 max.
From the dyno/track tests I've done and seen by others I trust, the cross-over where a single plane starts out powering a dual plane is 4500-4800 ish rpm. Below that rpm a dual plane has always been better,.. above that rpm a single plane has always been better. It doesn't seem to be related to anything but rpm so far. cfm - cubes - cam etc don't seem to matter, just rpm.
rewguy wrote: ↑Thu Dec 26, 2019 12:36 pm Hoping to make 475-490hp if that sounds realistic.
That's more than realistic I think. Pseudo made over 500 at the same cubes, close on cam, more comp, but... un ported small port vortec bowties heads.
If I was going to pick an intake for your combo, I'd put a Motown on it. It has had a better power curve than the other single planes we've tested it against. It has made more power below peak HP and the same peak HP. It has scored the best in EMC testing and that is the rpm range your working in.
The gm intake mentioned and 2913 eddy will run good too, but as mentioned it needs some porting.
With your combo and stall speed,... single plane all the way if I was doing it.
Randy