Thread: Noticeable difference?

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i am going to go out on a limb here and guess the sportsman 2's. below is an exact quote from thier site about the heads. unless the vortecs have had a litte work done to them you probably wont get a 30 to 70 hp gain as with the sportsmans.


Continuously improved since its 1987 introduction, the Sportsman II is still the industry's most popular cast iron high performance head. Featuring RightCast® 200cc intake runners, Fast-Burn chambers and your choice of angled or straight plugs, they're good for 30-70 horsepower increases right out of the box. They are the aftermarket's only 50-state emissions legal cast iron high performance cylinder head (E.O. #D-343-1). You should also know that all World Products heads are precision CNC-machined, and indexed off the chambers to assure perfect alignment with the cylinders.

i'd go with the sportsman IIs and reccomend also stepping up the cam just a little bit to get the most out of your new parts.... you'll have to go with cam and lifters since the lifters you have have already worn to your cam

For the same price i'd probably go for the Dart iron eagle 180cc's. The sportsman 2's are getting a little bit outdated with the combustion chamber design they have nowadays and they only come in 200cc which is a little big for a mild 350.