Couple questions:

1.) Know abot Portflow, but who else would people recommend. What should I expect to pay for a quality job?

2.) I am assuming I need to take the head off and send to them. In doing so, do I need to take everytihng out of the head, i.e. cams, valves, etc.

3.) How much of a performance increase should I expect with my current mods (header, intake, cat., V-AFC).

4.) Anything else I should consider?

 

1. Portflow is the way to go. his rate is 900-950 if i remember correctly
2. you can just remove the cams/caps/spray bars and send as is
3. expect a good amount of gain in midrange, maybe a little up top
4. things to consider depends on what your ultimate goal is

 

What is the purpose of using oversize valves? I would imagine just a better rate of flow? pros/cons?

 

good for use in over bored(ie 83+mm) but no real use for stock bore
cant use aggressive cams due to valve-valve clearance issues

 

I think you are right with the flow. Get fresh air in faster and get exhaust gases out faster. Not sure beyond that.

 

gotcha

 

Exactly what Sakai said. Big meaty midrange, just a little on top.
Real smooth curve.

I had Topspeed do my head. I think he gets $700-750.00, and his turnaround time is 2 weeks or so. Highly recommended.

Sorry for the shitty scan.
Before and after ported head.
B18C5, stock cams, stock ECU, stock exhaust, AEM intake, V-AFC, gears, DC JDM
Head was milled 12 thou for 11:1 compression.

 

Whats the email or number for topspeed?
Thanks

 

j.n.holcombe@worldnet.att.net

or

(239)514-7008

Ask for Josh

 

Where is Topspeed located?

 

I think in florida.