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Can l35 vortec cpi intake be used on a i35 scfi motor

Posted by Anonymous on


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Head Swap

The 2.8 is a 60 degree engine, and the 4.3 a 90 degree engine. Meaning the bank of the cylinders in relation to the center line of the engine. If you were asking about a 3.8 and 4.3 I'd say yes you could, as each of these is based on a 305, and 350 respectively. I don't believe the 2.8 and 4.3 have the same cylinder head bolt patterns to allow correct mounting to the block. Additionally you have to be sure about valve opening clearance requirements using the larger cylinder head because of the smaller bore of the 2.8. The 4.3 heads have larger valves, and may not clear the block surrounding the bore. The chamber of the 4.3 heads might extend onto the flat surface of the 2.8 block which is an engineering no-no due to hot spots/dieseling and other problems you would design into this monsterous mating.
I like the way you think though. Chevrolet has been doing this since they introduced the first small block back in the 50's.
You are right about the 2.8 being a dud. I had one, and it couldn't get out of its own way. You might be better finding a good low mileage 4.3, and grab the mounts along with the vehicle you got the engine from. Also be sure you get the computer, and harness. If that vehicle is injected and computer controlled, and yours is not, there would be a whole nother host of issues to deal with that you don't sound like you would wanting to encounter. In that case you might as well drop a small block in, because the issues would be similar.

Posted on May 21, 2009

  • 3433 Answers

SOURCE: 4.3 cpi rough idle ,pops on acceleration to

Chk theTPS Throttlrposiyion sensor Good luck, Ned

Posted on Sep 27, 2009

  • 1 Answer

SOURCE: 1995 chevy 4.3 idling at 2300 rpms

1995 S-10 Chevy Blazer just replaced fuel pump now it is idles at 1500 RPM's what should I do.

Posted on Nov 14, 2009

  • 2299 Answers

SOURCE: Engine turns over but does not start. I poured

Either a bad fuel pump or fuel pump relay. Take off the gass cap, have someone listen where the gas cap goes. When you turn the key to the on position you should hear the fuel pump run. If not, find the relay under the hood. Swap the relay with the one next to it (temporarily) Turn the key off then back on. If you hear the fuel pump running then replace the relay. If not the fuel pump is bad. Which is usually the problem.

Please Vote! Thanks!

Posted on Aug 31, 2010

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1 Answer

How do I remove and re install the CPI unit and gaskets on a 1998 Chevy Blazer with Vortec V6

You have to reove the upper plenum. that is the part on top of the intake that looks like a dome on top of the lower intake.There is 8 10mm bolts around the outside of the dome part. the disconnect the fuel lines at back of lower intake and remove the cpi unit.

Sep 12, 2014 | 1998 Chevrolet Blazer

1 Answer

I have a 96 chevy 2500 5.7 vortec with bad poppet valves, can i change to a throttle body intake from a 95. both are pre obd 2

You can't change the intakes on it. The 1995 throttle body and the efi that they used on the 96 up are totally differant. In 1996 when they went to the vortec motors they changed the heads. the 96 up only have 8 bolts to bolt the intake to the motor and are totally differant angles on the bolt holes. the 87-95 centerbolt head motors had 12 bolts to hold the intake down. Also the 96 should be odb 2 by government compliance. 95 was a split year but 96 up should be odb 2. If you do a search online you should be able to find the new injector or alot of time you can just get the poppets.Either way in the long run you will be better off fixing what is the rather than trying to convert.

Jan 04, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

97 jimmy runs when you pour gas into throttle body, fuel pumps is putting out 55 to 56 psi. but will not pickup the gas from the injectors, fuel manifold psi is 55 to 56psi. 1997 4.3 vortec engine

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

I’m happy to assist further over the phone at

Oct 17, 2010 | 1997 GMC Jimmy

1 Answer

Engine turns over but does not start. I poured

Either a bad fuel pump or fuel pump relay. Take off the gass cap, have someone listen where the gas cap goes. When you turn the key to the on position you should hear the fuel pump run. If not, find the relay under the hood. Swap the relay with the one next to it (temporarily) Turn the key off then back on. If you hear the fuel pump running then replace the relay. If not the fuel pump is bad. Which is usually the problem.

Please Vote! Thanks!

Aug 31, 2010 | 1995 GMC Sonoma

1 Answer

I am looking for the fuel pressure regulator on a 1997 GMC 1500 truck it has the vortex engine in it.

The Vortec motors typically have the fuel regulator down inside the intake (yep you have to remove the top section of the motor to see or replace them). Also you need to go to a special location on the Internet to find a replacement fuel regulator or you will be forced to purchase the whole fuel rail. It is designed with rivets you have to drill out to remove just the regulator. I replaced mine with a kit I bought on the Internet for about $100 (that was about five years ago) and it was about a difficulty of 5 because I had to drill a small hole and buy a special "security" Torx tool. Also read this first in case there's a problem in the manifold "plenum" that is leaking and not the regulator:
For the 4.3L vortec a regulator and special security tool can be purchased here:
Buy the CPI regulator kit including regulator, gasket, mounts, bolts and the wonderful instructions for $100 here or call 1-888-809-3835 to order by phone:

Jul 25, 2010 | GMC K1500 Cars & Trucks

1 Answer

Po300 code/ when is cool in the morning,the suv when a due gas .

Sounds like your fuel pressure is leaking gas which is located in your intake platinum with your fuel injector unit (SCFI). When the fuel leaks out over night, it floods the intake with gas causing it to give your the issues you have described.
The other issue that may be happening is that your SCFI system is on it's way out due to excessive carbon build on the fuel poppet nozzle which is causing you to have the issues your having.
With the problem you have described, i would lean towards the faulty fuel pressure regulator leaking since the Blazer is running fine after the extra fuel that leaked in to the intake have burnt off.
Replace the fuel pressure regulator first and clean the upper intake platinum of carbon before reassembly.
Thank you for using fixya and good luck

Jun 05, 2010 | 1997 Chevrolet Blazer

1 Answer

96 gmc vortec will not start


Dec 30, 2009 | 1996 GMC Sierra

3 Answers

Know if my 95 chevy blazer has a spider CPI?

A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.

Oct 10, 2009 | 1995 Chevrolet Blazer

2 Answers

4.3 cpi rough idle ,pops on acceleration to

did you check for vacoum leaks?

Sep 26, 2009 | 1994 GMC Jimmy

3 Answers

What years 4.3 vortec will fit in my 2000 Chevy Blazer? Thanks!

The years of 1996 to 2002 with the engine code L35. Just becareful that the year 2002 is the change over year from L35 to LU3. The L35 fuel system is the SCPI (Sequential Central Port Injection)  The LU3 fuel system is the MPFI (Muilti Port Fuel Injection)
Good luck and hope this Helps.

Jul 20, 2009 | 2000 Chevrolet Blazer

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