cam swap on my 92 gmc tbi
#11
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193's are 64 cc's, just like 062 or 906 Vortecs..... The only swirl ports with larger chambers are found on some 1 ton trucks with a casting number like 14102191. Those have 76 cc chambers. A half ton's LO5 will be 9.3:1 compression with 64 cc chambered 193's.
They are a terrible head for top end power, but for low end torque they actually do okay. That said Vortecs will do better than the TBI's across the board...
But then a junkyard LQ4 will skulldrag all above combos so who really cares.....
They are a terrible head for top end power, but for low end torque they actually do okay. That said Vortecs will do better than the TBI's across the board...
But then a junkyard LQ4 will skulldrag all above combos so who really cares.....
But usually in the quest the OP has seems to be the search for more power, it just depends on what he plans to do.
#12
But then really if you want to get right to it, if he wants more than a torquer or mild performer, why is he staying with a TBI truck....... or a 350 for that matter. Guys have made some impressive numbers with a TBI truck but it's dinosaur technology that fewer and fewer people can do much with..... or want to. Most in that case, just stick on a carb and forget about TBI. For a budget build its cheaper to swap a cammed 6 liter than it would be to build up a 350 and then do whatever you are going to do for induction. If budget is less of a concern....... well do whatever you want.
Look at it this way maybe. You can cam an LQ4, dump on a set of headers and make a very mild drivable engine that is 400 Hp and similar torque, or more depending on what you want to live with.
Good luck even getting a TBI 350 to ever run and produce that much power. It's been done, sure. Usually a 383 or 400 would be used though. But I can guarantee you it will cost double what the LQ4 swap would.
Look at it this way maybe. You can cam an LQ4, dump on a set of headers and make a very mild drivable engine that is 400 Hp and similar torque, or more depending on what you want to live with.
Good luck even getting a TBI 350 to ever run and produce that much power. It's been done, sure. Usually a 383 or 400 would be used though. But I can guarantee you it will cost double what the LQ4 swap would.
Last edited by 1994Vmax; 03-18-2012 at 07:10 PM.
#13
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A big reason to run a Edelbrock TBI performer intake is the OP is from "CALI" so things like EGR are important.
Nobody mentioned it, but on all my TBI trucks I have had, I have set the base timing between 4-8 degrees advanced with the electronic advance disconnected. Some people say that does nothing, but it makes give up a little more off the line take off. Have to run better fuel though, or it will ping.
I am doing a LQ4 swap on my 94 suburban. So I am selling my Edelbrock TBI intake, stainless shorty headers, magnaflow Y-pipe. My 94 TBI won't work, but if you send me pictures of your TBI, I probably have the right base in the shop I can do the ultimate mods to for you. New EGR, IAC, and o2 sensor.
I also have some wire looms and an open element air filter setup.
Nobody mentioned it, but on all my TBI trucks I have had, I have set the base timing between 4-8 degrees advanced with the electronic advance disconnected. Some people say that does nothing, but it makes give up a little more off the line take off. Have to run better fuel though, or it will ping.
I am doing a LQ4 swap on my 94 suburban. So I am selling my Edelbrock TBI intake, stainless shorty headers, magnaflow Y-pipe. My 94 TBI won't work, but if you send me pictures of your TBI, I probably have the right base in the shop I can do the ultimate mods to for you. New EGR, IAC, and o2 sensor.
I also have some wire looms and an open element air filter setup.
#14
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At the very least the stock heads need some real valve springs to handle any kind of cam. I forget what the stock cam specs are but the lift is well under .400" i believe. its one of the saddest cams gm ever used. the heads can be improved to some extent but for the money you might as well get some iron world heads or darts or worked over vortecs which will far out perform the Tbi heads.
#15
A big reason to run a Edelbrock TBI performer intake is the OP is from "CALI" so things like EGR are important.
Nobody mentioned it, but on all my TBI trucks I have had, I have set the base timing between 4-8 degrees advanced with the electronic advance disconnected. Some people say that does nothing, but it makes give up a little more off the line take off. Have to run better fuel though, or it will ping.
I am doing a LQ4 swap on my 94 suburban. So I am selling my Edelbrock TBI intake, stainless shorty headers, magnaflow Y-pipe. My 94 TBI won't work, but if you send me pictures of your TBI, I probably have the right base in the shop I can do the ultimate mods to for you. New EGR, IAC, and o2 sensor.
I also have some wire looms and an open element air filter setup.
Nobody mentioned it, but on all my TBI trucks I have had, I have set the base timing between 4-8 degrees advanced with the electronic advance disconnected. Some people say that does nothing, but it makes give up a little more off the line take off. Have to run better fuel though, or it will ping.
I am doing a LQ4 swap on my 94 suburban. So I am selling my Edelbrock TBI intake, stainless shorty headers, magnaflow Y-pipe. My 94 TBI won't work, but if you send me pictures of your TBI, I probably have the right base in the shop I can do the ultimate mods to for you. New EGR, IAC, and o2 sensor.
I also have some wire looms and an open element air filter setup.
OP mentioned nothing about emmissions...... not my problem, lol...... However.....
If you want to get technical the Vortec head swap is illegal via Cali law too.... as none of the Vortec head to TBI intakes have EO approval..... even the ones with EGR. Oddly enough that Edelbrock TBI to MPFI conversion thing available for Vortec heads is, but that's it.
Even the factory 1996 van intake that was TBI but for Vortec heads won't work as it was a different emission class than a 1/2 ton truck.
California is lame, leave the thing stock, lol.
Last edited by 1994Vmax; 03-19-2012 at 05:02 PM.
#16
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92 through 95 uses the same TBI base and pod. 1991 and older had the different pig tails for the throttle position sensor....... So you can try and sell him the entire TBI while you are at it. If you try and sell him the 91 and older setup you are selling him the incorrect parts.
OP mentioned nothing about emmissions...... not my problem, lol...... However.....
If you want to get technical the Vortec head swap is illegal via Cali law too.... as none of the Vortec head to TBI intakes have EO approval..... even the ones with EGR. Oddly enough that Edelbrock TBI to MPFI conversion thing available for Vortec heads is, but that's it.
Even the factory 1996 van intake that was TBI but for Vortec heads won't work as it was a different emission class than a 1/2 ton truck.
California is lame, leave the thing stock, lol.
OP mentioned nothing about emmissions...... not my problem, lol...... However.....
If you want to get technical the Vortec head swap is illegal via Cali law too.... as none of the Vortec head to TBI intakes have EO approval..... even the ones with EGR. Oddly enough that Edelbrock TBI to MPFI conversion thing available for Vortec heads is, but that's it.
Even the factory 1996 van intake that was TBI but for Vortec heads won't work as it was a different emission class than a 1/2 ton truck.
California is lame, leave the thing stock, lol.
#17
My tbi350 was at 6* timing when i unloaded it.sum-1103 cam,ported heads,custom chip,LT's,50mm TB,holley projection intake manifold port matched.I was about to stroke it,throw a carb,weiand vortec intake and vortec heads.
#18
Don't go back in time man go to the future these LS truck motors are a dime a dozen and should be able to get one for $1000 with all accessories not sure on price of a wiring harness there are a lot of books for $30 to swap LS engines into anything
#19
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Im with Vmax and others,you can spend a pile of dough only to make it run a little better
back in 05 did a TBI 350 added trickflow heads, headers and a custom roller cam and chip,of course cat back.ran good,not quite as good as the new 96 250 hp vortec stock ran,that new vortec felt strong it the day.
do a 5.3 or 5.7 or 6.0 transplant
I have never seen a strong TBI 383,heard a lot of guys say they were
back in 05 did a TBI 350 added trickflow heads, headers and a custom roller cam and chip,of course cat back.ran good,not quite as good as the new 96 250 hp vortec stock ran,that new vortec felt strong it the day.
do a 5.3 or 5.7 or 6.0 transplant
I have never seen a strong TBI 383,heard a lot of guys say they were
Last edited by gonzo 6.2; 03-21-2012 at 12:40 AM.