ADVICE: Port my 2gen head or not??

Onefast99gsx · 11-26-2004

Hey everyone... i have a '99 GSX. My car is parked for the winter as i'm putting on the goodies that i been purchasing over the past near 2 months( PTE 50trim turbo, PTE 780cc injectors, DSMLink v2, 1g throttle body, 1g head). I will get 272 cams sometime in the spring as i'm pretty tapped out right now and saving for wheels. I really want to get the most of of my car. My goals: 11.99 at least once to say i did it. 12.0 to 12.50's on any given day at the track.

Another popular member on here from the cities told me that a 2gen head in the long run is better because there is more material to work with than a 1gen head. I was thinking of mainly just port matching to the 1gen intake(Stage I/ II?). My head has low miles on it and i'd really like to stick with it. Yeah, i could just bolt a 1gen head on but i've seen many 1gen heads with the cracked valves guides where the valve stem meets with it. I don't want to get into changing that stuff.

Based on my goals and what i've said above, can someone recommend something to me? Don't port it, port match it, etc...

Looking for advice from you guys that actually know something about it and not just ones opinion.

THANKS!!!!

EclipseGST · 11-27-2004

personally this is kind of an opinion but also a fact you have to think about... the way i see it is if you have a lot of money to burn then port the 2g head, its going to cost a substantial amount of money to make a 2g head better then a 1g head. where as you could spend the money getting a 1g head lightly ported and polished, reseat the valve seats and probably still have some money left over to get a nice intake manifold. i dont know how much money we are talking here on porting the 2g head but i know its not goin to be cheap comparing price wise to the power you get out of it. i believe Raptor is workin on make a 2g head flow a lot better than a 1g head right now and i am kind of curious to know what price range we are talking about here. so mike if you see this i would be interested in a estimate cost... thanks

~Jake

At-Least-It's-An-Evo · 11-27-2004

Just throw a stock 1g head on there and call it a day.

**Shane@DBPerformance** · 11-27-2004

You can run 11s and make decent power on a stock 2G head. Putting on a 1G throttle body and a sheetmetal intake would help alot. The 2G intake manifold is the bigger problem. You could for fairly cheap just swap on a 1G head and 1G intake manifold. People talk about how the 2G head is better for a radical port job, but I don't know anybody who actually spent the money to have it done and is running one. The port size at the intake flange isn't everything, it doesn't have to be huge like on the 1G head. It is small on the EVOs and they have no trouble making power. It is small on Honda VTEC heads and they excel at making HP at high RPMs. Port matching the 2G head to a 1G intake manifold can be done, but it takes a shit load of time and work. You have to pull metal out pretty deep into the ports to get a smooth transition to the large port size on the 1g intake manifold. You don't want to try to make the change from 1G intake port size down to 2G intake port size in an inch, air flow doesn't like having big changes in port angles.

john · 11-29-2004

As far as porting costs, locally I believe a stage 3 head is ~$300 and a stage 5 port is ~$500. The stage 3 1g heads supposedly flow better than a stage 3 2g head meaning that a 2g head would need $500 to outflow a 1g head. If I were going to spend the money, I would do 1g head, intake mani, TB, and you could aslo afford a stage 3 port job and new valve seals ($50). If you want to keep the stock head, ghettostyle has a new 2g Venom sheet metal intake manifold he is looking to sell. PM him ASAP if you want it as I believe he is going to be shipping it out in a day or two.

slowbubblecar · 11-29-2004

The venom sheet metal intake is pretty much sold.

Onefast99gsx · 11-29-2004

ghettostyle- if the guy or whoever is buying it backs out let me know. I'd be interested in it. I could pick it up. I'm about 1hr east of Eau Claire but would travel to Mpls. Before i get too far with it, how much is a used one going for nowadays?

**JET** · 11-29-2004

I would just go with a 1g head with some mild porting. I wouldn't bother with the 2g head, it takes a LOT of work to make it flow better than a 1g head. If you really want some flow, then go with 1mm oversized valves and call it a day.