The 24 thread..
#16
Registered
Joined: Oct 2006
Posts: 443
Likes: 0
From: St. Petersburg, Fl
as far as I know about 20hp and they turn higher rpm. They also have the newer stlye intakes. Usually promax blocks are painted black and x's aren't... for some reason mine aren't painted either...
#17
Registered

Joined: Nov 2003
Posts: 2,504
Likes: 153
From: Cape Coral, FL
The 300x's have different port timming, a little more compression and a different fuel injection system. The 300x's make around 340HP and the 300 Promax's make around 300HP. Both great motors.
#19
Are you looking for one? I know of one for sale here in Virginia.







