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Old 09-28-2010, 01:40 PM   #1
renosubby
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Default Should I port and polish heads.. Is it worth it

So I am doing BC 280 cams and valve train.
I am wondering if porting would be worth the cost! please let me know.
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Old 09-28-2010, 02:00 PM   #2
kellygnsd
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At what HP/$ ratio is worth it to you?
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Old 09-28-2010, 02:12 PM   #3
renosubby
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if im going to gain 15-20 whp then yes it's worth the price.. but if its 5whp no way
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Old 09-28-2010, 02:26 PM   #4
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Off topic

What are you going to do to keep the HGs in place? ARP Studs, o-ring the block?

I would say that porting and polishing the heads is worth it with a nice set of cams, how much will you gain? no one knows
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Old 09-28-2010, 02:30 PM   #5
renosubby
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Quote:
Originally Posted by juanmedina View Post
Off topic

What are you going to do to keep the HGs in place? ARP Studs, o-ring the block?

I would say that porting and polishing the heads is worth it with a nice set of cams, how much will you gain? no one knows
arp studs
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Old 09-28-2010, 04:39 PM   #6
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Need more info. What turbo? How much boost? What fuel? HP target?
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Old 09-28-2010, 04:43 PM   #7
renosubby
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Fp red, forged internals, and all supporting mods
500 on c16. now at 465 on 110
on pump i make about 395 i was hoping for 415 on pump
24 psi pump
29-30 race
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Old 09-28-2010, 08:57 PM   #8
ASU
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I assume that you are going to run bigger sized valves, the best bang for the buck port you can do to your heads in blending the bowls its cheap and thats where your are going to get most of your power.
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Old 09-28-2010, 09:35 PM   #9
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Quote:
Originally Posted by ASU View Post
I assume that you are going to run bigger sized valves, the best bang for the buck port you can do to your heads in blending the bowls its cheap and thats where your are going to get most of your power.
from someone who ports heads and has spent lots of time on the flowbench, I completely agree. Massaging the neck/bowl only will save time and money and give a nice gain. Unless you are going for an insane goal or record, don't sweat a full port job.
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Old 09-28-2010, 09:47 PM   #10
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i say just get the mahcine shop to show your heads a little love nothing too crazy...after all the way to make more power is to flow more air and add more fuel
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Old 09-28-2010, 09:57 PM   #11
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Quote:
Originally Posted by Homemade WRX View Post
from someone who ports heads and has spent lots of time on the flowbench, I completely agree. Massaging the neck/bowl only will save time and money and give a nice gain. Unless you are going for an insane goal or record, don't sweat a full port job.

I had a Head melt down, they where fully ported actually crazy ass porting. Now I have a new set of heads that where cut for valves and just blended bowls. So it goes on the Dyno on Weds so Ill report on the HP loss which I will see some loss but I dont think anything big. Setup exactly the same except for heads.
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Old 09-29-2010, 04:52 AM   #12
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It definitely worths porting and polishing.Depending on how much boost
you plan to use ,you ll see proportional gains.
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Old 10-19-2010, 11:37 AM   #13
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Quote:
Originally Posted by ASU View Post
I had a Head melt down, they where fully ported actually crazy ass porting. Now I have a new set of heads that where cut for valves and just blended bowls. So it goes on the Dyno on Weds so Ill report on the HP loss which I will see some loss but I dont think anything big. Setup exactly the same except for heads.
any update on this???
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Old 10-19-2010, 12:18 PM   #14
ASU
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About a 10 whp loss nothing big.
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Old 10-19-2010, 12:43 PM   #15
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Quote:
Originally Posted by ASU View Post
About a 10 whp loss nothing big.
how was the power curve?
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Old 10-19-2010, 05:37 PM   #16
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10whp sounds pretty low for something making 562whp -- Even with most of the gains being in the bowls / valve upsize. 2% power gain =(
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Old 12-01-2010, 03:11 AM   #17
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ASU what turbo was that on and what cams?
10HP at $1000 of Labor doesnt sound good to me!
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Old 12-01-2010, 10:53 AM   #18
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I dont just look at PEAK power when a port job is done... I also look at power curve.
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Old 12-01-2010, 10:55 AM   #19
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^^^truth. I also look at the trend of the torque curve.
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Old 12-01-2010, 01:02 PM   #20
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im thinking ASU had small cams,
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Old 12-01-2010, 03:01 PM   #21
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sorry.can you explain me about porting??? what is it??
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Old 12-01-2010, 03:03 PM   #22
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porting is when you port your exhaust tip for more flow, make it a potato shooter
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Old 12-01-2010, 03:45 PM   #23
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^^^^nice

Quote:
Originally Posted by xmel012 View Post
sorry.can you explain me about porting??? what is it??
but really, it is when you cut/grind away material inside the exhaust and intake ports to increase flow capacity and flow characteristics...not for noobs to do. You can do more damage than good.
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Old 12-01-2010, 04:45 PM   #24
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I'm a noob and I did it? my aluminum bit is my friend. I deshrouded my heads, I forgot the grit number but ported my runners. But not to contradict you homemade I've read alot of your words and I stand by alot of what you say, and I agree . I actually hit a few valve seats and ended up going with 1+ because of it but it's a blessing in desguise.
I figure if u don't got it in the car. Might as well do what you can while you can. It's all worth it.
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Old 12-01-2010, 05:20 PM   #25
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I'd like to think i did a good job with the bowl, I wish i went with +1 oversize valves.

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