2003 Mach 1 4.6L DOHC carbureted with distributor, custom wet nitrous system. MSD digital 7 programmable ignition. Heads stage III CNC ported by Fox Lake Power Products. Custom dome JE nitrous pistions. Motor built by Jeff Chambers, owner of CRT Performance. Vids taken at CRT Performance shop during motor inital breakin. Initial timing at 18-19 degrees for breakin..
I think that adapter to allow any 5.0 pushrod intake on a 4.6 4V is a really slick idea. Great for street rodders and engine swappers. Or if you want to swap in a 4.6 into an earlier 5.0 fox car and keep all your existing fuel injection stuff intact.
However, it's not the best for performance. Pretty much any 4.6 intake will out flow any 5.0 intake with that adapter.
Here's an article I read from MMFF magazine where they tested it out.
Also, that company, KarKraft is now out of business. No more neat adapters from them!