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Stage 4 Porting of a TBI 350 193 Head

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Old 04-25-2013, 04:58 PM   #1
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Stage 4 Porting of a TBI 350 193 Head

I ran across this guy on youtube that did what he calls a stage 4 port on a set of 193 TBI 350 heads. He is up to Part 5 just on the ported 193 TBI heads.

Below is the link to Part 1 of the TBI porting

www.youtube.com/watch?v=QMkCV1s5BQ8

He has videos of other Chevy heads (LT1s, 601, 882, ProComps, etc).

I don't know about his work, but to me, he was pretty informative.

Dave

Last edited by malibudave; 04-25-2013 at 05:01 PM.
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Old 04-30-2013, 02:49 PM   #2
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Re: Stage 4 Porting of a TBI 350 193 Head

Wow, not bad. pretty informative. Thanks for the link!
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Old 09-01-2013, 07:20 PM   #3
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Re: Stage 4 Porting of a TBI 350 193 Head

Your link was awesome!
Quote:
Originally Posted by malibudave View Post
I ran across this
guy on youtube that did what he calls a stage 4 port on a set of 193 TBI 350 heads. He is up to Part 5 just on the ported 193 TBI heads.

Below is the link to Part 1 of the TBI porting

www.youtube.com/watch?v=QMkCV1s5BQ8

He has videos of other Chevy heads (LT1s, 601, 882, ProComps, etc).

I don't know about his work, but to me, he was pretty informative.

Dave
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Old 09-02-2013, 02:10 PM   #4
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Re: Stage 4 Porting of a TBI 350 193 Head

Quote:
Most people HATE this head, but when done is a stage III.5 version, it gets about 60 more Ft. LBs. and about 4 to 6 more MPG. This was done in conjunction with a custom HeadBytes camshaft, and Edelbrock TBI intake manifold.
So he changes the cam and intake manifold--both of which are known to be utterly lame in stock form--along with the head work, but he only specifies the improvement of the combined modifications.

HOW MUCH of that increase is due to the cam and manifold (First guess: 95%) and how much is due to the grinding of the ports and chambers (First guess: 5%)

Polishing the swirl-port turd may provide minimal gains, but you'd be farther ahead to drop-kick them directly into the recycle bin, and put your time, money, effort, and enthusiasm into '96-up Vortec, or other aftermarket heads instead.
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Old 09-02-2013, 03:19 PM   #5
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Re: Stage 4 Porting of a TBI 350 193 Head

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Originally Posted by Schurkey View Post
So he changes the cam and intake manifold--both of which are known to be utterly lame in stock form--along with the head work, but he only specifies the improvement of the combined modifications.

HOW MUCH of that increase is due to the cam and manifold (First guess: 95%) and how much is due to the grinding of the ports and chambers (First guess: 5%)

Polishing the swirl-port turd may provide minimal gains, but you'd be farther ahead to drop-kick them directly into the recycle bin, and put your time, money, effort, and enthusiasm into '96-up Vortec, or other aftermarket heads instead.
I must admit that I would rather see the gains individually accounted for. However, if you look at threads/photos/flowbench results posted here by longtime members such as DynoDon or especially Fast355, it makes one wonder just how far one can go with the 193 heads. Also, Dynobytes guy had to port the edelbrock intake as well.
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