Has anyone DIY port/polish there heads? - Pontiac G8 Forum: G8 Forums - G8Board.com
 
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post #1 of 14 (permalink) Old 11-20-2012, 03:20 PM Thread Starter
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Has anyone DIY port/polish there heads?

I plan on getting vms's 1.5 cam and installing it myself, I cant afford a port polish head job from them but was reading up on doing it myself, it almost seems a waste to have the heads off and not de-burr them, port match and a polish. Ive been researching it and doesnt seem to be that hard. Has anyone did this befor or would it be a waste a time?

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post #2 of 14 (permalink) Old 11-20-2012, 03:25 PM
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I've gasket match ported heads before with my Dremel tool and carbid tips but I've never messed with the combustion chamber or the valve seal area. Gasket matching isn't that hard and it'll pick you up a few horse's that for sure.
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post #3 of 14 (permalink) Old 11-20-2012, 03:27 PM
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Im going to.
About an 1" to 1.5" within the valve seat is the most important.

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post #4 of 14 (permalink) Old 11-20-2012, 04:05 PM Thread Starter
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I c.....im not trying to go nuts here but i figured a little clean up in there cant hurt much.

2004 Turbo Cavalier Arrival Metallic Blue- @ 12 psi SOLD!
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2008 G8 liquid red - Custom CAI, armour coated 1 3/4 pacesetters headers (long tube), cat delete, X pipe, Doug Thorley axle backs, spectre 4" maf housing and LS3 maf card, rick crawford custom spec'ed cam (219/227, 604/614 113+1), dod delete kit, yank ss3600 stall, prc heads (ported/polished/milled .035), pat g tuned.
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post #5 of 14 (permalink) Old 11-20-2012, 11:09 PM
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Im going to.
About an 1" to 1.5" within the valve seat is the most important.
You're a little more advanced than the average DIY'er sir....

OP, FWIW the L92/LS3 castings flow so well that there has to be extensive amounts of work done to see a gain making it worth while. Even on the CNC'd castings I only see about a 25-30rwhp increase. All things considered those gains are acquired with a well thought out CNC program, valve job, etc. Simple touching up the heads with a dremel will yield little to no gains. If anyone wishes to debate that fact I'd love to see some solid data that states otherwise.

But hey, if it makes ya feel good do it.

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post #6 of 14 (permalink) Old 11-21-2012, 01:06 PM
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post #7 of 14 (permalink) Old 11-21-2012, 01:25 PM
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post #1, full "howto"

http://www.audiforums.com/forum/off-...e-wrong-80267/


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post #8 of 14 (permalink) Old 11-21-2012, 01:40 PM
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Quote:
Originally Posted by Damian View Post
You're a little more advanced than the average DIY'er sir....

OP, FWIW the L92/LS3 castings flow so well that there has to be extensive amounts of work done to see a gain making it worth while. Even on the CNC'd castings I only see about a 25-30rwhp increase. All things considered those gains are acquired with a well thought out CNC program, valve job, etc. Simple touching up the heads with a dremel will yield little to no gains. If anyone wishes to debate that fact I'd love to see some solid data that states otherwise.

But hey, if it makes ya feel good do it.
It's all the little things that add up in my book. 5 rwhp from a few hours of your free time, is time well spent. :-)

Lol Zep, I'm almost 100% sure that guy was joking. I can't live knowing that is real.


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post #9 of 14 (permalink) Old 11-22-2012, 12:39 PM
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It's all the little things that add up in my book. 5 rwhp from a few hours of your free time, is time well spent. :-)
I agree with your point, but 5rwhp could be dyno variance.

Hand porting L92/LS3 castings (especially with no professional porting experience) is a "feel good" thing. Won't make a lick more power but you'll feel good doing it anyway.

Cheers.

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post #10 of 14 (permalink) Old 11-22-2012, 06:39 PM
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Home port on a LTR450 Suzuki:


Same cylinder head after being sent off:


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post #11 of 14 (permalink) Old 11-22-2012, 11:43 PM
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That's a nice Suzuki head job. But I could have sworn we were on a G8 forum.....

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post #12 of 14 (permalink) Old 11-23-2012, 07:16 AM
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That's a nice Suzuki head job. But I could have sworn we were on a G8 forum.....
Hey stranger, good to see you stop by.

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post #13 of 14 (permalink) Old 11-23-2012, 07:48 AM
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That's a nice Suzuki head job. But I could have sworn we were on a G8 forum.....
Ahh, just an example I had in my pix on my laptop. Didnt have any pix of rectangle ports

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post #14 of 14 (permalink) Old 11-25-2012, 10:45 AM
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Hey stranger, good to see you stop by.
I troll around from time to time.

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