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  1. O

    1990 GMC Sierra Sport

    Still haven't finished everything yet. Need to relocate crossmember and install th400 yoke. Finish wiring, install rest of exhaust, rig up power steering lines and some other miscellaneous stuff. Hope to have some YouTube vids up soon for everyone.
  2. O

    4L60E 2-3 flare

    Flare between shifts is a sign of worn under/over rev clutches. Add a half-quart of fluid and see if that helps, if it does help then think about adding a shift kit. I have driven 4L60's that flared for 100k miles and some for 1k miles before they gave up.
  3. O

    Competing with a srt10

    I know everyone wants this thread to die, but don't fear nitrous... I have ran nitrous on many stock rotating assemblies and never blown an engine. It's all in the tune and don't get greedy. Learn to read plugs and how to tune. LS6 250 shot Zz502 200 shot 3v 4.6 175 shot 05 Titan 125 04...
  4. O

    TH400 crossmember

    I'm trying my best to NOT drill any more holes in the frame. Anyone have pictures of a 454SS truck trans crossmember or know if it's different than the 700R4 crossmember?
  5. O

    1990 GMC Sierra Sport

    Got my 388 in and Super Comp's installed. Still have to finish a lot. That engine fought me every step almost. My TH350 is actually a TH400, so gonna have a little more work there to do. Hopefully I can get another day off pretty soon to finish it up.
  6. O

    1990 GMC Sierra Sport

    388 hopefully going in this coming weekend along with TH350 and 3500 nitrous converter. 700r4 will not last much longer so I will use my TH350 until I can afford a 4L80 swap. Purchased Hooker Super Comps instead of the Maximizer's. 2" primaries scare me. To-do list for next weekend: - motor...
  7. O

    Holley Sniper EFI

    Holley makes a kit for dual tanks.
  8. O

    Holley Sniper EFI

    Having some fuel pressure issues with my Sniper. Suspecting that feeding the high pressure pump with the stock pump is the culprit. Next weekend I have off, I will be plumbing the stock tank to bypass the stock pump. Fun...
  9. O

    No Y-pipe available for LT headers?

    I am going to try the Maximizers. I will post all the install pics here or in my build thread. It will be a few weeks before I order tho, funds are drained a bit from the Sniper install.
  10. O

    Feels slow even after rebuild and rough idle

    Put a timing light on it. See what you have at idle and at 4k rpm. Let us know the results.
  11. O

    Holley Sniper EFI

    Did you have to adjust cranking fuel any?
  12. O

    Tbi to efi swap

    If you want it to control timing, do not use a magnetic pickup distributor. Save yourself some headache and buy their Hyperspark dist and coil. After I did that, it has been smooth as silk and runs better than factory.
  13. O

    Tbi to efi swap

    I just finished my GM TBI to Sniper EFI swap. Fun!
  14. O

    Holley Sniper EFI

    Just copy whatever device swaps tanks for supply.
  15. O

    Holley Sniper EFI

    Other random advice. Don't use a carb spacer. Make great connections, solder and heat shrink. Do everything you can to eliminate RFI. Make sure Sniper gets 12 volts while cranking. I will keep updating this thread as time goes by.
  16. O

    Holley Sniper EFI

    My review. So far, I love the kit. Is it truly plug and play and fully self tuning? Yes and no. If you have already converted over to carb and want to go back to FI, then yes, you will have an easier time with it. My instance has been a little more difficult and pricey. Luckily, I had some...
  17. O

    No Y-pipe available for LT headers?

    Sorry, got those confused with another set I saw on Ebay. Wish they had more pictures of those. Definitely would want some time off from work to do those as it looks like some passenger side frame and cab modifications are gonna be necessary.
  18. O

    No Y-pipe available for LT headers?

    The Maximizers look like downtown leak-city to me...lol
  19. O

    No Y-pipe available for LT headers?

    Is there not a single company out there that makes a matching y-pipe for their LT headers? This is the first vehicle that I have ever owned that I can not find a matching y-pipe for. Any other options out there other than exhaust shop? Most of the shops around me don't want to touch a vehicle...
  20. O

    1990 GMC Sierra Sport

  21. O

    1990 GMC Sierra Sport

    Installed phaseable rotor and Sniper is now on point with ignition timing duties. I love this kit! Now that I'm getting used to tuning with it, I think it's about time for the 388 to go in.
  22. O

    1990 GMC Sierra Sport

    Got my Holley Super Sniper installed and removed a ton of old wiring. I like this kit pretty well.
  23. O

    1990 GMC Sierra Sport

    Swapped out dash speakers and added small sub yesterday. Removed AC compresor and removed a pile of crap from under the hood that GM thought was once necessary.
  24. O

    Howdy

    My name is MattD and I joined this forum hoping to share my knowledge and get educated when necessary. This is my first street/strip pickup build. I have been drag racing for over 25 years and I love to street race. I have disassembled my drag car and the motor and maybe the trans from it are...
  25. O

    1990 GMC Sierra Sport

    I picked up this truck as a project for $800. A young person owned it before me and had a lot of the typical mods that are all done through your local auto parts store. The motor was shot when I got it and needed a swap. I put one of my spares in it to get all the 27 year-old truck problems...

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