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tbi 350 cam decision. and computer question

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Old 01-30-2010, 01:10 PM   #1
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tbi 350 cam decision. and computer question

i have recently got a tbi 350 for my truck. i was looking into giving it a little more power. my question is what would be the best cam for a daily driver?

i have been looking at this cam

http://www.summitracing.com/parts/TF...e%7c5.7L%2f350

the engine is out of a 92 fullsize. my truck is also a 92 s10 tbi 4.3.

would the cam i have picked out be a good cam for the motor? any susgestions would be great.


also were can i get my computer reprogramed? or is there a chip i can buy and install myself? i have also heard sometimes you dont need to have the computer reprogramed?
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Old 01-30-2010, 01:39 PM   #2
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Re: tbi 350 cam decision. and computer question

It looks like a pretty decent cam. I'd run it, especially for the price. lol It really depends on everything else you've done to the engine as I'm sure you've heard a thousand times. I'm going to be running a more mild grind with my TBI set up, but I also have a 283. Cams designed for larger displacements small blocks act like a "bigger" cam in little dudes like mine. Trick Flow makes good stuff. If you call them, they might be able to help you out. The last thing they want to do is sell you something that you want like, because then you are liable to say that their stuff sucks. Anyway, I'm in the same boat as you as far as the computer goes. The cam I'm ordering is compatible with stock chips so I won't have to worry about that when I get the engine running. Staying with Summit, I know they sell Motorvation chips that you can get custom programmed. I hope this helps. Let me know why how everything goes.
Old 01-30-2010, 01:40 PM   #3
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Re: tbi 350 cam decision. and computer question

Oh, also make sure your engine already has a roller cam. If not, you'll be shelling out over $300 for retro fit lifters.
Old 01-30-2010, 01:46 PM   #4
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Re: tbi 350 cam decision. and computer question

Go to tbichips.com write the guy an email and tell him what u plan to do and hell tell you everything you need to know. He even has a lot of stuff on the website that lets u know whats good for the engine and everything.
Old 01-30-2010, 01:56 PM   #5
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Re: tbi 350 cam decision. and computer question

the only thing done to the motor is heads have been shaved. it has a aftermarket cam in which made it knock. the guy i bought the engine from said he didnt knwo you had to have a specific cam for a tbi motor and the cam he used was for a carbed motor.
Old 01-30-2010, 02:01 PM   #6
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Re: tbi 350 cam decision. and computer question

Comp Cams only make 1 cam that works in a TBI, you really dont have much "cam selection".

There are a million ones that wont work, and very few that will. TBI is just not made for performance.
Old 01-30-2010, 02:02 PM   #7
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by SweetS10V8
Comp Cams only make 1 cam that works in a TBI, if that tell you about your cam selection.

There are a million ones that wont work, and very few that will. TBI is just not made for performance.

which is the one cam that will work?
Old 01-31-2010, 07:18 PM   #8
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Re: tbi 350 cam decision. and computer question

bump b/c i need to get it ordered.

one more question, will my stock 4.3 mounts work with the 350?
Old 01-31-2010, 07:43 PM   #9
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Re: tbi 350 cam decision. and computer question

yes everything from your 4.3 will work even the belt setup.

and far as cam goes you can put vortec heads on and get more power than putting a decent size cam in it. the TBI heads just suck.
Old 01-31-2010, 07:48 PM   #10
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Re: tbi 350 cam decision. and computer question

heads would be a little out of the budget. im tring to keep it a low budget swap.
Old 01-31-2010, 10:00 PM   #11
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Re: tbi 350 cam decision. and computer question

http://www.summitracing.com/parts/CCA-12-249-4/

i have also found that cam, it says Computer compatible for a 92 350. would this one work? or does anyone know the one comp cam that will work that sweets10v8 was talking about?
Old 01-31-2010, 11:09 PM   #12
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Re: tbi 350 cam decision. and computer question

do you have the eng with you. if you do pull the cam out and see what he had put in it. on the end it will have the manufatorer and grind number.

that cam will work, but little on the small side for me.
Old 01-31-2010, 11:13 PM   #13
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
do you have the eng with you. if you do pull the cam out and see what he had put in it. on the end it will have the manufatorer and grind number.

that cam will work, but little on the small side for me.
im tring to get a decent size cam without having to get a stall converter. what size would you recommend?


i have the engine, but im waiting on my engine stand to come in from harbor freight so i can tear it apart. but it has a erison(sp) cam.
Old 02-02-2010, 10:55 PM   #14
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Re: tbi 350 cam decision. and computer question

http://www.summitracing.com/parts/CC...n/?prefilter=1


would this cam be any better then the 249 i posted above?
Old 02-02-2010, 11:14 PM   #15
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Re: tbi 350 cam decision. and computer question

I would not think twice about that cam. It would be great for a TBI and pretty good hwy driveablitly. It will have good vac for brakes and it should not drive the computer too crazy. I am trying to find the OEM spec for a TBI cam and compare those. I would also run a 4.3 convertor to get another 4-500 rpm more stall. Make sure you get the supporting valve springs to go with that cam.

OEM specs are: Specs on Stock TBI cam is .050" tappet lift (intake/exhaust) is 179/194; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is .350/.384. Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. With the proper cam and springs the redline can easily reach 6000rpm.

Last edited by S15vortecpwr; 02-02-2010 at 11:17 PM.
Old 02-02-2010, 11:17 PM   #16
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Re: tbi 350 cam decision. and computer question

i plan on running my stock converter. so you would suggest the 256 over the 249 anyday?
Old 02-02-2010, 11:21 PM   #17
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Re: tbi 350 cam decision. and computer question

TBICHIPS.com recommends the 249 cam over the 256, but i like living over the edge a little I think he is also running 1.6 rockers so that will help the smaller lift of the 249. heres the link.

http://www.tbichips.com/truckmods.htm
Old 02-02-2010, 11:23 PM   #18
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Re: tbi 350 cam decision. and computer question

what are you planning to run for rockers? 1.5 or 1.6

1.5 i would go for the bigger 256
1.6 i would go for the smaller 249
Old 02-02-2010, 11:24 PM   #19
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Re: tbi 350 cam decision. and computer question

my truck is a daily driver. so i would need the one that would be the most reliable. so would you recommend that stick with the 249 to be safe?
Old 02-02-2010, 11:25 PM   #20
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
what are you planning to run for rockers? 1.5 or 1.6

1.5 i would go for the bigger 256
1.6 i would go for the smaller 249

stock.
Old 02-02-2010, 11:31 PM   #21
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Re: tbi 350 cam decision. and computer question

from personal exp i have run alot bigger than the 256 in a TBI trk, but i had to idle it up with the idle adjuster and it got only about 10 mpg. It was in a 89 2500 and i think the cam was around a 272 or so. It loped real bad and it ran out real quick since the TBI was not tuned. it need ore air and fuel.

for a DD i would go little small with the 249. I would want it to be the most driveablilty it can be. you still should get a 25hp boost or so. If you have driven a stock TBI you will deffiently feel a difference. R u doing anything with the heads, like any porting or decking.

If i would have kept my 95 silverado i was gonnna go for the 256 but i have 3 other vehicle to drive also.
Old 02-02-2010, 11:33 PM   #22
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
from personal exp i have run alot bigger than the 256 in a TBI trk, but i had to idle it up with the idle adjuster and it got only about 10 mpg. It was in a 89 2500 and i think the cam was around a 272 or so. It loped real bad and it ran out real quick since the TBI was not tuned. it need ore air and fuel.

for a DD i would go little small with the 249. I would want it to be the most driveablilty it can be. you still should get a 25hp boost or so. If you have driven a stock TBI you will deffiently feel a difference. R u doing anything with the heads, like any porting or decking.

If i would have kept my 95 silverado i was gonnna go for the 256 but i have 3 other vehicle to drive also.

the heads have been shaved. idk how much. thats how i bought them.
Old 02-02-2010, 11:34 PM   #23
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Re: tbi 350 cam decision. and computer question

that will help bump up the compression. That will help with that cam also. anything to help out those heads is a plus.
Old 02-02-2010, 11:38 PM   #24
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
that will help bump up the compression. That will help with that cam also. anything to help out those heads is a plus.

yea, thats all i know about the engine except its been freshly rebuilt with the wrong cam. until i get my engine stand to tear it apart.
Old 02-02-2010, 11:42 PM   #25
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Re: tbi 350 cam decision. and computer question

keep us posted and pics are a must. lol
Old 02-02-2010, 11:43 PM   #26
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Re: tbi 350 cam decision. and computer question

i got a few pictures of the engine when i picked it up. give me a sec ill post them.
Old 02-02-2010, 11:58 PM   #27
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Re: tbi 350 cam decision. and computer question



Old 02-02-2010, 11:58 PM   #28
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Re: tbi 350 cam decision. and computer question

Old 02-04-2010, 06:45 PM   #29
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Re: tbi 350 cam decision. and computer question

since my truck is bagged can i use stock upper control arms? i run a 25.5" tire. but soon to be 25.
Old 02-07-2010, 05:16 PM   #30
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Re: tbi 350 cam decision. and computer question

I had this cam and it worked excellent: http://www.summitracing.com/parts/CCA-12-364-4/
I had TBI 350 setup in my 96 S10 which was my daily driver. That cam worked great with the stock engine and with a modified engine. That cam is designed for TBI compared to other cams which are just computer controlled which is not the same thing. With a stock engine with the Edelbrock TBI intake, that cam, 1 3/4 shorty headers, duals, powerglide trans and 3.73's it ran 14.60's. With 10:1 motor Holley intake, that cam, World Sportsman II heads and 4.30's ran 13.22 @ 103. From what I found and from what I have been told those heads are terrible, biggest improvement is changing those heads. Also that cam didn't require any tuning with the stock engine but needs 1.6 rockers which you can get a good Pioneer set without breaking the bank Hope this helps.

Allen
Old 02-07-2010, 07:31 PM   #31
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Re: tbi 350 cam decision. and computer question

so i just finished tearign the engine apart.. and found



both are the same cylinder just two diffrent pictures. so looks like now i need to look for a piston and ring kit. any help finding one for this engine would be great. stock bore
Old 02-07-2010, 11:28 PM   #32
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Re: tbi 350 cam decision. and computer question

i have decided on my rebuild kit
http://www.summitracing.com/parts/FEM-CSMHP761-011/

i got undersized bearing b/c my crank has been machined.
i should have everything in the next couple weeks.
Old 02-08-2010, 12:17 AM   #33
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Re: tbi 350 cam decision. and computer question

little advice run a stock oil pump. that high volume pump will suck the oil out of the pan in the upper RPM's

r u sure you crank is 10/10 or more. make sure on your bearings b4 ordering. It appears that something got on top of that piston and beat it up. the cam in it did not do that. Your pistons will need to b pressed on also.
Old 02-08-2010, 12:28 AM   #34
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
little advice run a stock oil pump. that high volume pump will suck the oil out of the pan in the upper RPM's

r u sure you crank is 10/10 or more. make sure on your bearings b4 ordering. It appears that something got on top of that piston and beat it up. the cam in it did not do that. Your pistons will need to b pressed on also.

yea the bearings that came out of the motor said .010. but we do believe something did that to the piston, or it was just a weak piston. im just glad it didnt scare up the cylinder wall.
Old 02-08-2010, 01:02 AM   #35
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Re: tbi 350 cam decision. and computer question

so the stock oil pump would be the way to go instead of the high volume?
Old 02-08-2010, 04:14 PM   #36
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Re: tbi 350 cam decision. and computer question

If the bearing say .010 than you are good to go. That oil pump will work if you run a 6qt or bigger oil pan. I have a hgih volume pump in my 78 camaro and at around 5k rpms it will loose oil pressure due to it sucking the oil out of the pan. It will turn 6500.

I guess it really depends on how many rpm's you planning on turning with it.
Old 02-08-2010, 05:05 PM   #37
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Re: tbi 350 cam decision. and computer question

well i took the block to the engine shop at school to let them hone it out for me and it cant be be fixed by honing. and i dont want to bore the cylinders so now i have to look for another block. and the crank isnt any good either it needs to be replaced
Old 02-08-2010, 06:51 PM   #38
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Re: tbi 350 cam decision. and computer question

whats wrong with boring??? Unless its a money thing.

IMO i would try and find a new long block of your liking. When i build my camaro motor 9 years ago i have roughly 3000 in it. 60 over, cam, pistons, rods, crank, heads, intake, carb, rockers, etc. basicallly the only thing old is the block. The heads are newer. You can buy a 400+ hp SBC for $2k now if you look. I am pushing 350/375 or a from a 305. The only reason i build it was to prove everyone wrong that you can make a 305 run with a 350 and so far it has outlasted 4 of them. lol.

building a motor is not what is is cracked up to be. I enjoyed building it, but now i have learned in my older years, just buy new and be done with it.

Last edited by S15vortecpwr; 02-08-2010 at 06:55 PM.
Old 02-08-2010, 06:55 PM   #39
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
whats wrong with boring??? Unless its a money thing.

IMO i would try and find a new long block of your liking. When i build my camaro motor 9 years ago i have roughly 3000 in it. 60 over, cam, pistons, rods, crank, heads, intake, carb, rockers, etc. basicallly the only thing old is the block. The heads are newer. You can buy a 400+ hp SBC for $2k now if you look. I am pushing 350/375 or a from a 305. The only reason i build it was to prove everyone wrong that you can make a 305 run with a 350 and so far it has outlasted 4 of them. lol.

building a motor is not what is is cracked up to be. I enjopyed building it, but now i have learned in my older years, just buy new and be done with it.

nothing is wrong with boring it its basically a money thing. i was tring to keep the build around 500 and now i defiently cant do that b/c the rotating assembly was around 600 by its self.
Old 02-08-2010, 07:10 PM   #40
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Re: tbi 350 cam decision. and computer question

or if i could find a good set of used rods i would have my crank re-turned to .020 and that would save around 200 then i could afford it
Old 02-08-2010, 10:18 PM   #41
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Re: tbi 350 cam decision. and computer question

did it spin a rod bearing too, if it did, i would have to say he overreved it and the piston came apart. I have seen a few pistons come apart. I even seen a forged piston come all too pieces when it hit 7500 rpms, the top ring land came completly off the piston.
Old 02-08-2010, 10:31 PM   #42
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by S15vortecpwr
did it spin a rod bearing too, if it did, i would have to say he overreved it and the piston came apart. I have seen a few pistons come apart. I even seen a forged piston come all too pieces when it hit 7500 rpms, the top ring land came completly off the piston.
sounds like what happened. i believe ill hold off on rebuilding the engine for now. and buy a few part at a time when i can afford it. or maybe ill come across a good deal on a running 350.
Old 02-10-2010, 01:11 PM   #43
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Re: tbi 350 cam decision. and computer question

so i found another 350 local. only thing is its a 79 and is carbed. does anyone know if i can put the tbi heads on it and run tbi that way? or will i just have to stay carbed?
Old 02-11-2010, 01:19 PM   #44
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Re: tbi 350 cam decision. and computer question

decided to pick up the carbed 350 and keep it carbed to clean up the engine bay. im going to buy a re-ring kit for it and a cam. just wondering if this cam would work without a stall converter?

http://www.summitracing.com/parts/SUM-1104/
Old 02-11-2010, 01:37 PM   #45
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Re: tbi 350 cam decision. and computer question

You should be fine with that cam and the stock torque converter.
Old 02-11-2010, 02:16 PM   #46
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Re: tbi 350 cam decision. and computer question

Quote: Originally Posted by So_vayne
You should be fine with that cam and the stock torque converter.

would it go well with the rest of the engine stock?

Last edited by cory_watson; 02-11-2010 at 02:17 PM.
Old 02-11-2010, 06:51 PM   #47
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Re: tbi 350 cam decision. and computer question

another question, will the serp belt setup off of my other 350 or my 4.3 work on the 79 350 block and heads?
Old 02-11-2010, 09:46 PM   #48
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Re: tbi 350 cam decision. and computer question

the tbi intake will bolt to the 79 heads and they are probably better than the tbi heds anyway.

the serp will owrk, but one of the alt bracket at the bottom had to be tapped for the use of 89 camaro serp kit on my 78 camaro, i didn't wory about that and just used the one bolt

that cam will work without a stall but for maximum performance a 2500-3k stall is preferred. that is one cam bigger than the one in my 78 camaro (i have a th350) and i drove it awhile with stk convertor, i added a 2800 stall and it was like night an day. It drove much better with the stall. Thats cam spec starts at 2200 rpms ans a factory stall is more around 1500. you will be fine to start with. this will just give you a good start for more upgrades. Mine has a very choppy idle but i have mine idled down (500rpm in gear) so it will lope hard.

Last edited by S15vortecpwr; 02-11-2010 at 09:51 PM.
Old 02-11-2010, 10:24 PM   #49
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Re: tbi 350 cam decision. and computer question

would you suggest to run the tbi or run the carb? i would be running a quadra jet. and if the tbi would be better would i need the tbi cam?
Old 02-11-2010, 11:48 PM   #50
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Re: tbi 350 cam decision. and computer question

I like the TBI for ease of cranking and running when cold. It is also very easy to install.

I like a carb for performance.

I was just stating that you could put the TBI intake on those heads, they all have the same bolt pattern.
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