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  1. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    Exhaust is stinky with air pump hooked up or not. Not that I love huffing exhaust fumes but this k5 has a distinct smelly exhaust. I put dual 2.25” exhaust on it and it has a little more power vs when it had the crunched y pipe stock exhaust. Can I just leave air pump disconnected and...
  2. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

  3. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    I don’t have any good pics of the exhaust manifolds but here’s what the passenger side looks like. Just the single big tube where the plug is in the link. https://www.summitracing.com/parts/rnb-674-245/make/chevrolet/model/k5-blazer/year/1986
  4. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    I took the belt off the air pump and no more backfiring! I don’t have a catalytic converter so no need for the air pump? I’ve left the EGR and all hoses connected. I don’t see any air tubes into the exhaust manifolds. Ok to keep driving like this? Engine runs fine and thankfully no more...
  5. TDoc

    Carb Adapter

    I have a spare edelbrock 2701 square bore dual plane intake . Would it be worth it to install this instead of my stock Quadrajet cast intake? I would need to use an adapter like this, correct? It’s supposed to be reversible. https://a.co/d/8RabIbE Engine is a high output 305 LE9. Stock...
  6. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    No exhaust leaks since exhaust was redone. Where is the diverter valve? On the air tube to the manifold? I was going to take the belt off the air pump and see if that changed anything. I’ll try retarding timing a bit before I pull air pump belt. But I don’t think I need the air pump anyway...
  7. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    Factory quadrajet, intake and ESC. Air pump still operational but no catalytic converter.
  8. TDoc

    LE9 305 ESC backfires through exhaust on deceleration

    I have a ‘86 k5 Blazer with a LE9 305 with Electronic Spark Control. It has always backfired 1-3 times through the exhaust on deceleration. It runs great aside from the backfiring. It has new spark plugs, cap, rotor, wires. How do you check and set timing on an ESC engine? I recently put dual...
  9. TDoc

    LE9 305 w ESC Performance upgrades '86 k5 Blazer

    I added dual exhaust this weekend. Stock manifolds, dual 2 1/4” with 24” magnaflow generics. Sounds good and runs stronger, mostly noticeable in the higher revs. It used to shift smooth and soft at wide open throttle. Now it has some kick. Maybe +5-10 hp. I have some videos of the exhaust sound...
  10. TDoc

    dual exhaust kit

    A good amount of cutting and welding to make the 89004 header kit work with stock manifolds. Reused stock manifold down pipe and adapted exhaust kit to weld up to it. I was going to do headers but decided to leave the manifolds. The bends in the Dynomax kit are good to clearance around the...
  11. TDoc

    Exhaust Question

    I ordered the Dynomax squarebody universal 2.25” header back kit 89004 due to price. I was able to get summit to price match the shipped price from advance auto $144. I added (2) stainless AP Exhaust XS1255 (magnaflow generics) $44ea. I’m only into the dual exhaust conversion ~$250 (so far lol.)...
  12. TDoc

    dual exhaust kit

    Here’s my ‘86 k5 305 w stock 4bbl quadrajet, 700R4. Still rocking the stock exhaust which is super thin in spots and the y pipe is beat up by the front driveshaft. Which is why I’m switching to dual exhaust. I’m not expecting a power increase, but would be nice. The catalytic converter was...
  13. TDoc

    dual exhaust kit

    I just ordered the 89004 kit which is a header back universal kit for squarebody truck and suv. I’m going to try and adapt it to my manifolds. If that doesn’t work I’ll order headers but would rather stick with manifolds. Summit sells the Dynomax 89004 kit for $173...
  14. TDoc

    Wheel choices for 4x4

    I need to clean off all the grime and brake dust on the inside to see the model number stamping and offset. Waiting for a warmer day to go at it with super clean and a wire wheel for the inside. For the face I’ll probably try white diamond or blue magic metal polish. Mothers wheel polish must...
  15. TDoc

    Wheel choices for 4x4

    Found a set of 16x8 Mickey Thompson aluminum slots on marketplace. Need to clean them up but for $150 I’ll spend the time refurbishing them. Will have to see if they have enough offset for the draglink. Guy I bought them from had them on his GMT400 Tahoe.
  16. TDoc

    NEW Brothers Dash Bezels - CHEAP

    Dang. Missed out on the dash bezel deals. Oh well, maybe some stock will turn-up again.
  17. TDoc

    K5 K10 17x8 or 17x9 vision Cheyenne Aluminum rally wheels?

    Even with my extended lugnuts, is this as simple as measuring 7/16 from end of wheel stud, mark it. Count the turns until I hit that mark, then mount wheel and hopefully I get the minimum amount of turns determined earlier. The internet says 8.5 turns for a 7/16 stud. I’ll double check that...
  18. TDoc

    K5 K10 17x8 or 17x9 vision Cheyenne Aluminum rally wheels?

    The 16x8 AR172’s on my 79 k10 - Unfortunately the offset isn’t correct and the fronts hit the drag link. Used 5mm (3/16) spacers up front and the drag link clears just barely. The inner clip on wheel weights hit the drag link so I can solve that by going to stick on wheel weights. I’d like to...
  19. TDoc

    K5 Blazer values… possibly buying 86 k5

    Swapped wheels with my k10 and went to 285/75/16 tire. Replaced the Ranchos with Bilstein 5125’s. Apparently this has a lift since full extension on the front is 20” and 26” for the rear shocks.
  20. TDoc

    K5 K10 17x8 or 17x9 vision Cheyenne Aluminum rally wheels?

    The K5 got the Discount tire 16” wheels and tires from my k10 and the k10 got the AR172 16” wheels and tires. Both are 285/75/16 about 32.8” tire.
  21. TDoc

    K5 K10 17x8 or 17x9 vision Cheyenne Aluminum rally wheels?

    Winner, winner, chicken dinner! Guy showed up and I checked the stamp on the inside 15x8.5. Looks like I’m going with the AR172 16x8 wheels.
  22. TDoc

    Holley / Brothers trucks clearance sale

    My k10 is a 79 but the 80 grill fits fine and I don’t mind the small difference in design vs the 79 grill, for the deep discount.
  23. TDoc

    NEW Brothers Dash Bezels - CHEAP

    I just purchased a new ‘80 grille for my ‘79 K10. 75% off of LMC’s shipped price. https://www.gmsquarebody.com/threads/holley-brothers-trucks-clearance-sale.45907/
  24. TDoc

    NEW Brothers Dash Bezels - CHEAP

    What’s the difference between the AC and non AC? Is the vent above the HVAC controls different or something like that?
  25. TDoc

    Holley / Brothers trucks clearance sale

    I just purchased a new factory grille for my K10. LMC $258.50 shipped - before tax Holley $65.81 shipped before tax ~ 75% off.

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