I have this blower on my car. I have 2V open chamber heads. I will eventually need to do NEW heads (to get rid of crappy multi-groove valves), and since the only cost I will have is valves (already have springs, retainers, and locks) and the cost of some 4V castings (if I cant get grandpa to give me the old CJ heads he has in his garage), I might as well debate whether to go 2V open or 4V open.
If I stick with the 2V I would have to do a full port job. Since I know jack about porting, any attempt I make would probably be a) not enough, and b) hurt more than it helps. That, and I HATE working with carbides (damn metal splinters get everywhere).
if I go 4V, I would still need to port match, but would I need to do much else? The exhaust side could use some work, but on a boosted car, I dont want it to be TOO good do I?
Performance... will the blower make up for any "lack of" low end velocity in these heads? Does the fact that I already have a 2500 stall and 3.89 gears make this question unnecessary?
Either way I am getting a new intake and new headers, so those are not considerations. The cost of 4V OC castings is minimal, so its basically a question of how much porting I would have to do on the 4V and if there is a performance delta in the equation.
Oh, the blower: