Vulcan heads-gasket match and polish exhaust ports, paint exterior-$150 for the pair of heads.
Vulcan heads-all above, plus gasket matching and polishing of the intake ports-$200.
A couple things to note: you don't want to touch the lower intake, the rougher surface helps to atomize and swirl the fuel mixture a little better. Also, the stock bowl area around the valves is adequate, so there's no need to go nuts there as long as you're not planning on forced induction.
Porting and polishing tends to yield better gains in the upper RPM's. With the Vulcan engine, the low end torque is retained, and freer breathing is allowed at higher RPM's. I had done this to the first engine that was in the car, and it showed about a 4-5 HP increase on the dyno.
Porting and polishing on a Vulcan (or any engine for that matter) should be considered a building block for other things, such as forced induction, freer flowing exhaust, etc. Alone, you don't notice that much of an increase, but it will work in conjunction with other mods.
Originally posted by Anemicmargarita@Oct 23 2004, 08:39 PM So if I were to run New platinum plugs, 8mm wires, CAI, and dual flowmasters On top of the P & P What could be the estimate of hp gain? 25 - 30 hp?
So I only have two options to make my vulcan faster. 1. buy a supercharger or 2. BUY A REAL SPORTS CAR. I think I'm gonna go with number 2 . Within about 3 months my Gen II will be up for sale if anyone wants it, low miles, great condition.
honestly, for the money you are thinking about spending on the p&p, you should invest in a chip. you will notice some gains from it.....not just a little on the top end! i agree with brad, plug wires get you nothing, stock air box flows plenty of air per the demands of the motor(stock) and too large of an exhaust will be a dissapointment! brian