Page 1 of 2 12 LastLast
Results 1 to 20 of 38

My Silverado, engine swap coming soon

This is a discussion on My Silverado, engine swap coming soon within the GM Trucks forums, part of the Vehicle Specific category; Hello Everyone, this is my 2004 Silverado It has a 4.3L V6, 4L60E - 4:10 rear gears. The engine I ...

  1. #1
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    My Silverado, 4.3L to SBC swap

    Hello Everyone, this is my 2004 Silverado











    It has a 4.3L V6, 4L60E - 4:10 rear gears.







    The engine I am building to swap in place of the 4.3L is a 350 Vortec L31















    The engine is a .040" 350ci, 4 bolt main, one piece rear, roller cam block.
    ZZ4 forged crank & rods
    H3445NCP-40 pistons, .004" below the deck .045" quench with .041" compressed head gaskets. 10.13-1 compression with the Vortec 64cc heads

    The cam is a LT4 Hot Cam with Proform 1.6 aluminum roller rockers. Comp Beehive springs, retainers & 8 degree locks.

    Lift @ .050" : .525"/.525"
    Dur @ .50" : 218 Int / 228 Exh
    112 degree lobe sep
    108 degree intake centerline

    3000rpm stall locking torque converter for the 4L60E, to make this cam drivable in a 4380lbs pickup.

    The heads are 916 Vortecs, currently getting bowl hogged but will also be gasket matched, polished chambers, polished exhaust ports.



    So, why not a LS/LQ swap?

    Because the L31 is the perfect candidate for a 4.3L to V8 swap. The fuel injection is practically identical and all of the 4.3L accessory brackets, serpentine belt system & pullies and engine control sensors can all be used on the L31 V8. Even the v6 distributor can be used with a new cap for the v8.

    I can retain a few currently used 4.3L performance parts. The K&N intake can be modified to work with the V8. The 74mm CFM-Tech throttlebody will transfer over. I already have HPTuners to write the V8 computer tune. The only custom work to be done will be modifying the trucks wiring harness for the v8 injectors, exhaust work,a motor mount adapter plate to adjust for the V8 re-located motor mount provisions.

    Cheers ~Mykk
    Last edited by 04SilveradoMykk; 09-08-2008 at 08:09 AM.

  2. #2
    Junior Member
    Join Date
    Jan 2008
    Location
    MISSION TX
    Posts
    24

    YELLOW
    2001 GMC SIERRA

    badass, BUT I WOULD GO WITH A 408 LS1 YUST ME, GOOD JOB

  3. #3
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Quote Originally Posted by SIERA*123 View Post
    badass, BUT I WOULD GO WITH A 408 LS1 YUST ME, GOOD JOB

    Yea, right on. You've got one to give me?!

  4. #4
    Member
    Join Date
    Jun 2007
    Location
    THE 405
    Posts
    169

    Black
    2007 Silverado

    you coulda got a 5.3 from a junkyard for like $500 or less...
    2007 RCSB 5.3L

  5. #5
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Quote Originally Posted by dozerdan View Post
    you coulda got a 5.3 from a junkyard for like $500 or less...
    And spent way more for the internals.

    The engine, heads & F.I. were free... I've got $500 in what you see here.

    Anyway you look at it LSx performance parts cost way more than performance SBC parts

  6. #6
    Junior Member
    Join Date
    Jan 2008
    Location
    MISSION TX
    Posts
    24

    YELLOW
    2001 GMC SIERRA

    Quote Originally Posted by 04SilveradoMykk View Post
    Yea, right on. You've got one to give me?!
    HE MAN, THAT 350 WILL DO GOOD YOU DON'T HAVE TO GET OFFENDED

  7. #7
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    The roller lifters, retainers & cage arrived today. As well as the valve covers, although I don't have the heads back yet.



    Here's a cool trick for ya with valve covers.

    Plain ball milled covers.



    Paint over the top of the cover. In any color, I chose black because my block & heads are black... but you could do your engine color. Red, chevy orange, blue..etc.



    Than take a few brakcleen soaked shop rags and rub off the paint on the cover, and the recessed parts of the cover remain.



    Cheers ~Mykk

  8. #8
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Finished up the long block.

    Pinned all 16 rocker studs, gasket matched the heads & intake manifold. Bored the Vortec upper plenum from 72mm to 74.4mm to match the CFM-tech throttlebody. New swirl polished valves and cleaned up the rough casting in the exhaust ports.

















    Got the geardrive & CKPS reluctor wheel in behind the timing cover.







    Did need to use a couple valve spring shims notched for the crank keyway to space the reluctor wheel away from the crank gear as to not interfer with the geardrive.


    Best of all, everything turns over and spins freely... No binding. No PTV interference. no coil bind, no retainer to seal issues. No geardrive to CKPS reluctor wheel clearance issues... so all is well, thus far.

    Today, the updated vortec fuel spider will arrive. And coming soon; March 3 piece underdrive pulley set, Summit aluminum vortec distributor, MSD wires and the SBC to LSx adapter plates.

    Cheers ~Mykk
    Last edited by 04SilveradoMykk; 08-19-2008 at 06:50 AM.

  9. #9
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    The Swap has begun:

    Sept 6th & 7th: I'll let the photos do the talking.































    Cheers ~Mykk

  10. #10
    Junior Member
    Join Date
    Jan 2008
    Location
    MISSION TX
    Posts
    24

    YELLOW
    2001 GMC SIERRA

    Good job man

  11. #11
    your parts guy!!! 1fastcamarosss11's Avatar
    Join Date
    Aug 2005
    Location
    cleveland ohio
    Posts
    11,376

    trans am 00 ws6
    1998 camaro ss vert

    looks good is it running yet?

  12. #12
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Day 4: Sept 09.

    I only had a couple of hours to work on the truck today. When my shift ended at my job tonight I rushed over to work on the truck with the intention to get as much done as possible, work all night if I had to. But I'm afraid mother nature had other plans, it was clear all day today untill I got to the truck and it began to storm, hard! Even though I am working under cover the ground under the truck floods quickly and the winds just about tear the make shift "Tarp Garage" apart.

    While I was working, I did notice a few problems.

    1) The driveshaft does seem to be binding. The yoke is pressed all the way in to the trans tail housing. I'll pull the driveshaft tomorrow to have it shortened & balanced, a local shop here does that for about $100.00

    2) Because the engine is back a bit from an OE location, I can't get the trans dipstick tube back into place. So I'll be looking into an aftermarket piece, like a Lokar flexable.

    3) With the engine mated to the trans, the flexplate is pushed right up onto the torque converter. And it's tight, so tight I can't spin either the torque converter or the engine over by hand I must not have the torque converter in all the way. While I have the driveshaft out I'll seperate the engine & trans a bit to see if I can't get the TC to slip in another click.

    I'm beginning to think I should have used the adapter plates that had the LSx mounts & SBC mounts 1" away from each other, if I had I would run into major header & motor mount interference issues. Oh well, The majority of the weight behind the front wheels equals better weight distribution.. right?

    Once it got dark and the ground became flooded I switched to the topside of the engine and finished up the wiring of the V8 fuel injector harness as well as lengthened the A/C high pressure sensor leads. Pulled the temp sender harness out of the loom a bit, made new heater hoses and a crankcase air supply hose.







    The old 4.3L throttle cable bracket will not work on the L31 intake manifold. GM needed to order the new bracket and I didn't want to wait, so instead I bent and modified the 4.3L bracket to bolt on to the V8 intake manifold. Seems to be working thus far.

    Hopefully tomorrow will prove to more prosperous. I don't work at the job tomorrow.

    This swap is taking a bit longer than I had hoped for, but I also knew I'd run into a few unforseen problems doing a swap like this.

    Cheers ~Mykk

  13. #13
    Senior Member 00z28bubba's Avatar
    Join Date
    Dec 2007
    Location
    las vegas, nv
    Age
    29
    Posts
    1,390

    white
    2000 Z28

    check on that throttle cable they are easy to break when in wierd positions.

  14. #14
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Quote Originally Posted by 00z28bubba View Post
    check on that throttle cable they are easy to break when in wierd positions.
    Thank you, I had already routed it differently before bolting down the AC lines

  15. #15
    Junior Member
    Join Date
    Jul 2008
    Location
    Ontario, Canada
    Age
    33
    Posts
    29

    Indigo Blue
    01 RCSB 5.3 Sierra

    well look who got some work done

  16. #16
    Member adam3566's Avatar
    Join Date
    May 2006
    Location
    Janesville,Wisconsin
    Posts
    880

    black Silver
    06 silverado/ 06 C6

    Nice looking truck except for that sticker 262ci and those ugly ass rims. Otherwise you got a nice ass truck. Swap looks good too.

  17. #17
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    So close guys, todays the day.

    The new TC arrived yesterday. Despite it's different design compared to the OE converter, it fits like a glove. So yesterday I got the entire truck bolted back together and on the ground.







    And this is what the CPS in the distributor looks like after getting upclose and personal to the firewall.



    I robbed the CPS from the V6 and moved on.

    The very first test fire, there was no fire. It just kept cranking. So I plugged in my laptop and saw, via HPTuners scanner, that TPS signal was 98% at idle and it wasn't reacting to my right foot. Upon closer inspection, I had the TPS harness plugged into A/C high side pressure sensor and visa verse. (Doh) So I put the right plugin in the right sensor and tried again.

    It wants to fire up, it spits & spudders... I have a feeling it's a timing/distributor thing. So this morning I'll go put the #1 cylinder to DTC and see where the dist rotor is pointing.

    More updates soon.

    Cheers ~Mykk

  18. #18
    El Toro Grande jaslivers's Avatar
    Join Date
    Mar 2006
    Location
    Ponca City,ok
    Age
    29
    Posts
    1,669

    1958 chevy pickup 283
    02 gmc z71 5.3L white

    hell ya, when you get it running we need vids

  19. #19
    Junior Member
    Join Date
    Aug 2008
    Location
    Prescott, AZ
    Posts
    18

    Silver
    2004 Silverado

    Well gents, I got as far with it in the amount of allowed time that I could. In the name of getting my truck running I hired out the rest of the job. So the truck was towed to a freinds shop where he will set the distributor to 0 degree via scan tool, make the new Y-pipe from the long tube headers back. And will fix a newly formed problem, one of the hard lines on the power steering rack was somehow busted and spewing PS fluid. (as you can see by the spot as itwas getting loaded on the flatbed)

    All in all I feel good about the project... I hand built my motor from a bare block & heads, and made it fit in a frame never intended for it. I just might have my friend wait to fire it up until I get there so I can be there for the intial run (with camera in hand)



    Cheers ~Mykk

  20. #20
    Member twoolley08's Avatar
    Join Date
    Jul 2008
    Location
    michigan
    Posts
    170

    black
    2000 trans am

    hey sweet truck i love what you have done with her

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 2
    Last Post: 05-25-2015, 04:58 PM
  2. Question: Cam swap coming
    By Fujbird in forum Internal Engine
    Replies: 0
    Last Post: 05-11-2008, 06:45 PM
  3. Silverado Engine ?
    By kool-aide in forum GM Trucks
    Replies: 7
    Last Post: 12-03-2007, 06:21 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •