Stage 4 Porting of a TBI 350 193 Head
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From: Houston, Texas
Car: 1980 El Camino
Engine: Turbocharged 305
Transmission: TH350 (future 4L80E)
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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
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 manualbrakes.com; Apr 25, 2013 at 04:01 PM.
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From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
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Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Re: Stage 4 Porting of a TBI 350 193 Head
Wow, not bad. pretty informative. Thanks for the link!
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Joined: Aug 2013
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From: Urbana,Il
Car: 92 Roadmaster
Engine: l05 350
Transmission: 4l60
Axle/Gears: 2.56 non-posi
Re: Stage 4 Porting of a TBI 350 193 Head
Your link was awesome!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
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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Re: Stage 4 Porting of a TBI 350 193 Head
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.
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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Joined: Aug 2013
Posts: 6
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From: Urbana,Il
Car: 92 Roadmaster
Engine: l05 350
Transmission: 4l60
Axle/Gears: 2.56 non-posi
Re: Stage 4 Porting of a TBI 350 193 Head
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.
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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