Thread: 1990 chey pick up 4x4

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There are some "TBI" cams and " Computer " cams available. but the dururations are what are special. however they will still need a chip program, and there still very mild...

a good example of what happens if you use the wrong... friend of mine in my high school autoshop class, swapped in a newly re ringed/ bearingd Vortech 350 into a '95 K1500 short bed step side.. He put on the TBI heads to avoid getting a new intake, and even tho I warned him about the cam choice. he put in a " Performance 3000 " camshaft.. it's a camshaft that Napa marks as OEM compatible for many carb'd 350 powered vehicles, I don't remember the dururation but it's 112" LSA I think. .442" lift IIRC.... truck sounded awsome.. problem tho, was it ran massivly rich and flooded/ destroyed 2 cats. and it would not spin the tires. just bogged down.. I don't know what he ever did with the truck..

Originally Posted by Matt167

There are some "TBI" cams and " Computer " cams available. but the dururations are what are special. however they will still need a chip program, and there still very mild...

a good example of what happens if you use the wrong... friend of mine in my high school autoshop class, swapped in a newly re ringed/ bearingd Vortech 350 into a '95 K1500 short bed step side.. He put on the TBI heads to avoid getting a new intake, and even tho I warned him about the cam choice. he put in a " Performance 3000 " camshaft.. it's a camshaft that Napa marks as OEM compatible for many carb'd 350 powered vehicles, I don't remember the dururation but it's 112" LSA I think. .442" lift IIRC.... truck sounded awsome.. problem tho, was it ran massivly rich and flooded/ destroyed 2 cats. and it would not spin the tires. just bogged down.. I don't know what he ever did with the truck..

well yes that what i said tpi cam will not work and many other will not i knew that on my last 350 build for my customer had a cam ground with one of ersons very small master with not alot of dur the 112 will not hurt its the dur and small lsa .i knew guys that used the hotter GM cams that plane would not work .... .i know abit about this as the cams were made in baycity GM and some how they were getting in some TBI engines and did not work very well. the MAP will not take the cam know if any one can tell me i am all ears i built my 4.3 bore it deck it did some bowl work to the heads back angled the ex valves used zz3 spring 1.6 harland rollers rocker .1 ich spacer .K&N fillter with edlebrock headers with stock roller cam just more lift with using the 1.6 at the time there was hotter marine cams but i knew guys were stuffing bigger cams in the TBI engines and just could not get them to run .i did put a chip in my 4.3 it ran good with it but the chip went bad. i put the stock chip back in. it ran about as good .it ran vey good for a 4.3 tbi

Originally Posted by pat mccarthy

well yes that what i said tpi cam will not work and many other will not i knew that on my last 350 build for my customer had a cam ground with one of ersons very small master with not alot of dur the 112 will not hurt its the dur and small lsa .i knew guys that used the hotter GM cams that plane would not work .... .i know abit about this as the cams were made in baycity GM and some how they were getting in some TBI engines and did not work very well. the MAP will not take the cam know if any one can tell me i am all ears i built my 4.3 bore it deck it did some bowl work to the heads back angled the ex valves used zz3 spring 1.6 harland rollers rocker .1 ich spacer .K&N fillter with edlebrock headers with stock roller cam just more lift with using the 1.6 at the time there was hotter marine cams but i knew guys were stuffing bigger cams in the TBI engines and just could not get them to run .i did put a chip in my 4.3 it ran good with it but the chip went bad. i put the stock chip back in. it ran about as good .it ran vey good for a 4.3 tbi

Pat,I would think you know about these already.Next time you do up a 4.3,might want to do this:

http://www.speedomotive.com/ps-502-8...crank-kit.aspx

I am coming up with a MAP answer for ya.

Still the O/P hasn't listed his cam numbers yet.So i am guessing what his issue is still.

Originally Posted by 1gary

Pat,I would think you know about these already.Next time you do up a 4.3,might want to do this:

http://www.speedomotive.com/ps-502-8...crank-kit.aspx

I am coming up with a MAP answer for ya.

Still the O/P hasn't listed his cam numbers yet.So i am guessing what his issue is still.

i did my 4.3 back in 2000. there were 90 cranks made back then but $$$$

Here is one of the links I was thinking of and had to find the file for it.4 barrel TBI's that will support up to 800hp.Stock???.Nope.But I can tell you all the number of carbs that compare to these and are priced very close to these.The TBI's are a very simple.No leaky float bowls or floats to deal with or needle and seats or jetting or chokes.Program the ECU(yes that might take some fiddling with) and go.When you are talking 800hp and I admit that is the extreme,you can't be talking about a cam that is tailored on the small side.Just a chip burn??.There are programs out there for that.We have had 383 V8 Astro's that use a TBI successfully.The stock or semi stock limited mods get close to the 400hp level.Truth be known is it is hard to take something like the stock units that by design where for fuel economy and emissions and turn them into performance units.LOL But that never stopped us before.Right??.

The link:

http://www.efisupply.com/4bbl_throttle_bodies.htm