This is a easy debate..................4Valve > 2Valve PERIOD. If your going to do a PI swap dont screw around with the 2valve do some looking and find a 4valve motor. Preferbly one from a Mach car (they are stronger than the 99-01 Cobra motors). With all the bolt on crap for a 2valve you will just be around or slightly higher than the 4 valve STOCK. My 99 made 272hp and 280tq on the dyno STOCK, thats the normal for these 4valves, however the Mach cars usually dyno 280hp+ and the tq is crazy on average ive seen 310-315 on these newer motors and thats bone stock numers fellas, they have diffrent cams and intake from the 99-01 Cobras. The modular motors have really advanced over the last 3 to 4 years.........dyno sheets DO NOT LIE. I would have much rather had a Mach 1 but I had to settle into something a litttle cheaper with my 7 year old cobra. Bottom line if you can locate a 4 valve motor GET IT and you may get lucky and have a ass kicker out of a Mach car 8)
I'm gonna have to debate you on this one snakie.
the value of a used setup depends on what you find.
but swapping from a 2V to a 4V takes alot more than the motor.
you have a different computer and wiring system, and alot of odds and ends that you'll be adding to get it running.
that will all add up in $$$ and hours.
plus you look at HP gains from any 4V, NA
unless you're adding a blown, forged 03 cobra setup, you're only gaining around 100-150ish HP.
you can get over 100 HP from ported PI heads and cams on a 2V.
I have a dyno sheet from TPH,
twin turbo'd 2V - 911 rwhp. :bunny3:
there's more info on my thread on the PI swap. Please read.
the 4V is nice, but it's not "alot better" when paired up to a nicely built 2V.
remember, the mighty 302 is a 2V with 1 cam....
I've raced a 96 cobra (4V) when I was still NPI and he only beat me by 1 car....
another factor in my book - if you're wanting to push over 500 HP, you'll have to rebuild the shortblock on the 4V too. $$$$
there's also alot to be said about correct suspension setup for traction, launches and corner exit, and
good old fashoned "im lighter than you'r 4V. pig." (no offence Snakie)
I've looked into these options before, so I have my opinions, hope it's helpful