I am going to take my dads old 78 polaris 440 cobra snowmobile and run it in the antique snowmobile drag races this winter.
Any suggestions on how to get a bit more out of one of these engines and keep it looking stock (ie exhaust syst and carbs)
i am planning on new rings and taking 10 thou off the heads to bring the comp up a bit, dont know if there would be much more i could do other than try to port the intake and exhaust but dont know what to exactly do that way.
Any thoughts