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Topic Review (Newest First)
01-11-2013 05:24 AM
Camaro_Nut2001 I finished porting the second head last night. I've got to cut the guides down, clean it, lap the valves in, clean it again and put it together. Plan on being ready to put em on and do my clearance checks, pushrod length etc... on Tuesday. Then its time to get the lil "Iron Duke" and 5-speed out and start getting everything ready for the swap. I have made my decision on the trans bolt access idea. Instead of cutting holes to get to the top bolts, thats what I did on my last S10 build, i'm gonna cut a section out of the floor pan, mig four small strips of 16ga. to the underside, lay a small bead of silicone on the strips and lay the piece I cut out right back in place after I get the motor and trans in. This way, if I ever have to pull the trans I can just pull the carpet, sound and heat dampner, floor plate up and have super easy access to the trans bolts . I've still got lots of playing to do but im gettin excited about seein what this lil flat top motor runs like.
01-09-2013 11:46 AM
ap72
Quote:
Originally Posted by 1Gary View Post
AP-I don't think on production Vortec heads you go as big as 190cc's.
you can, its not that tricky, just takes a little more time with a carbide bit. I've done several sets in the 190-194cc range. I keep it there as I usually use a 1.94" valve.
01-09-2013 07:58 AM
bygddy
Quote:
Originally Posted by vinniekq2 View Post
1gary. Im glad you share your knowledge with us.
I know that all members dont always agree or only partially agree,but I dont see the need for attacks.
Like you I offer my all be it limited,experiences. I enjoy learning at the same time.

I will try to be less blunt in the future,or take problems to private messages. I would like to see a few different engines and combinations in the future
+2..... I love a good debate, and any and all opinions....especially when there's experience or education behind them. Keeps things interesting....i sure as hell hope Garry isn't bowing out.....
01-09-2013 07:55 AM
1Gary AP-I don't think on production Vortec heads you go as big as 190cc's.
01-09-2013 07:22 AM
ap72 Porting them well will take them to about 190cc's and 250-260cfm with a 1.94" valve. And if you have a 350 that is approaching 6,000 RPM (very common for most hot street builds) that can equate to some major power.

The vortec heads were a design improvement but they were also truck heads that were produced as cost effectively as possible. Which leaves a LOT of room for improvement on a hot street build.
01-08-2013 10:09 PM
RAYFIN Porting Vortec heads is like touching up a Picasso...
01-08-2013 09:34 PM
vinniekq2 1gary. Im glad you share your knowledge with us.
I know that all members dont always agree or only partially agree,but I dont see the need for attacks.
Like you I offer my all be it limited,experiences. I enjoy learning at the same time.

I will try to be less blunt in the future,or take problems to private messages. I would like to see a few different engines and combinations in the future
01-08-2013 09:05 PM
1Gary
Quote:
Originally Posted by ap72 View Post
To say any port is optimized as cast is a bunch of stinky BS. Just as any other head they can be improved upon by porting the intake and exhaust, in the case of the oem production vortec heads they can be improved a great deal.
Ya know,honestly,it doesn't matter much what I think or what you think.I offer up what I know and you do as well.I promise you that in my retirement,nothing is going to upset me,and certainly not a post to the thread like this one.

I don't care about nothing more than trying to help out people.

All the battles are behind me now.

The eight bolt Vortecs I was told have a greater tendency to leak.But that could very well be because of the crappy OEM gaskets.
01-08-2013 05:52 PM
Camaro_Nut2001
Quote:
Originally Posted by techinspector1 View Post
Great article Gary, should be required reading for all of us....Joe explains the proper grit to use in the last paragraph of the article.
There you are, lol. I was hoping you would chime in on the DCR and SCR conversation we've had, not to mention your imput on the op.
01-08-2013 03:20 PM
ap72
Quote:
Originally Posted by 1Gary View Post
I am very sure by a reliable source the Vortec heads rough surface plays a role in the performance of the heads by suspending the A/F mixture.That you can benefit from porting the exhaust side,but not to alter the intake runner.That if you smooth port the intake runner,what your left with is just another set of OEM castings.
It is one of those deals that is a summary in your knowledge base you have learned along the way.
To say any port is optimized as cast is a bunch of stinky BS. Just as any other head they can be improved upon by porting the intake and exhaust, in the case of the oem production vortec heads they can be improved a great deal.
01-08-2013 02:57 PM
BuzzLOL .. Obviously there is benefit in altering the intake port... that's why heads have gone from the older 157cc intake ports to 175cc and 185cc Vortec intake ports and 195cc AFR's and 235cc MoTowns, etc...
01-08-2013 02:16 PM
techinspector1
Quote:
Originally Posted by 1Gary View Post
While I look for the ref to your question,I found this info that might be useful to the O/P:

Porting For Performance The Science of Horsepower: Engine Builder

Off hand I think it was Larry Carley or Joe Mondello,but I got to find it.You see at the bottom of this ref,Joe talking about a different finish on the intake side.But Joe has been dead I think for two yrs now,so I might not find the ref I want.I used to talk to him often too yrs ago.
Great article Gary, should be required reading for all of us....Joe explains the proper grit to use in the last paragraph of the article.
01-08-2013 01:52 PM
1Gary I am very sure by a reliable source the Vortec heads rough surface plays a role in the performance of the heads by suspending the A/F mixture.That you can benefit from porting the exhaust side,but not to alter the intake runner.That if you smooth port the intake runner,what your left with is just another set of OEM castings.
It is one of those deals that is a summary in your knowledge base you have learned along the way.
01-08-2013 12:25 PM
ap72
Quote:
Originally Posted by 1Gary View Post
While I look for the ref to your question,I found this info that might be useful to the O/P:

Porting For Performance The Science of Horsepower: Engine Builder

Off hand I think it was Larry Carley or Joe Mondello,but I got to find it.You see at the bottom of this ref,Joe talking about a different finish on the intake side.But Joe has been dead I think for two yrs now,so I might not find the ref I want.I used to talk to him often too yrs ago.
a different finish being a 80grit cartridge roll. even the finish a carbide bit leaves is must smoother than a rough casting, especially a GM casting. going over it with 80grit helps smooth the high and low spots, its not needed but sometimes it helps. I like to spray the port with dye right before I'm done and then take a used 80grit roll to it, the low spots show up immediately.
01-08-2013 11:24 AM
1Gary Patriot went out of business,so if you have a good set,you might want to baby them.I was told they where bought out and was going to reopen in acouple of months under another name,but I didn't get who bought them or what the new name was.
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