looking to swap a 5.3 engine and trans to an 85 p/u

[pcmcobra]

um, it took a few months...in my "rare" spare time after work and some weekends.
No ac...stock wiring harness reworked by speartech, stock ecm tuned by local shop.
z28 electric fans, motor mounts from carshopinc.
Finally!!! 6.0 POWAH!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

[85stepside]

pcmcobra,thanks for all the info&pics its really a big help looking forward to swap in spring.again sorry for all ??????? it was truly a big help.

[85stepside]

keniff,thanks for the info on the harness.

[87OldYeller]

This was info that was passed down to me. I though i would share his post with you.

header from summit part# SUM-G908 $153.93 they are shorty headers fit 99-04 truck requires slight mods to PASS side rail , i welded round stock to the underneath of the rail where i modifed it -you can use stock manifolds if you wish but make sure there the non EGR TYPE they will hit the frame where the EGR pipe mounts to on the manifold the header claim 15hp but do sound great

trans-dapt 4572 engine mount adapters $47 seems to put the engine nicely against the firewall with plenty of clearance, they're from summit as well
fuel pump airtex fuel pump E3270 provides plently of PSI $79.99 AutoZone
fuel pump lines, people spend money here for no reason go to a junk yard and get lines from a pickup or tahoe 99 -2003 from the rail to the tank and only modify the part where it
goes into the tank use a 87 - 91 EFI sending unit
make sure you use the EVAP lines if your using the charcoal canister ! im not so i got rid of it and plugged the hole in the intake but tapping it out with 1/2 tap and use a short bolt!
oh if you remove the EGR stuff of a 99-02 engine just remove the the plate that screws to the intake from the flex steel pipe and cap it dont buy one from GM for $30 takes 10 min to mod
top rad hose of a 2001 silverado $17.99
temp switch adapter 1/4 3/8 1/2 about $18.00 S&P
harness mods $212 including the OB11 i used a guy from ebay i was a little worried but it works great oh by the way i dont have A/C but others do i have his email so message me if you want it
ECU mods removing egr , rear O2s ,removing VATS, etc etc etc $75 i have his email too its a different guy
there are a few other mods like i moved the battery to the drivers side make a better fit IMO use a diesel tray there cheap , i used a KN filter out of a 2001 truck i got it for $75 used made a brackets works nice!!!
if your running cats your gonna have to make some mods to the factory 99-04 Y-pipe OR if your not running them you can do what i did i made my own flanges and made the pipe extentions from each header i put the front O2 bungs in each pipe extention and i was good to go!!! i cut my own gaskets from exhaust gasket sheet with the aluminuim works great no leaks
you might have to move your trans crossmember back and mod your drive shaft i cut mine 1 3/4in cost was $55
im using a 91 blazer/burb speedometer takes care of the the 4l60e /4l80e electronic speedo