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  1. Geoduck

    Update on my Ignition Module failure!

    Joe is right. Used OEM modules are now our best choice. Chinese are unreliable. Alex, your 86 305 may have a knock sensor on the passenger side lower block. A green wire that goes to the HEI. If so be sure to get the correct module for your 305. I have the OEM part number someplace if you need it.
  2. Geoduck

    1985 305 keeps dying after a few seconds

    Rylan, try snugging down the screws attaching the carb airhorn and the four that attach it to the intake. My guess your carb needs a rebuild but checking the bolts costs nothing. It may only be a vacuum leak. Good luck and let us know what you find out?
  3. Geoduck

    Chevy 292 upgrades?

    12bolt & Clifford performance as others suggested. An intake exhaust and carb are NOT cheap but would be a significant upgrade. Your 84 would have that awful one piece intake/exhaust and it's likely cracked or soon will be.
  4. Geoduck

    1987 Fresh Air Intake

    Thank you Dwight! I've been looking for this hose.+ Ordered one for my 1985.
  5. Geoduck

    final prep for vortec head swap

    Thanks Andy. Yep, it's the darn number 8 port header bolt location. They are over an inch different. LOL It may be both Andrew and I would be better off with headers. I know for a fact Summit SUM-G9006 fits mid 80's C & K 10's very well. I was just trying to cheap out.
  6. Geoduck

    1996-2000 truck stock Cast iron exhaust manifold on 1985 C10

    Thanks Andy, aways appreciate your input.
  7. Geoduck

    1996-2000 truck stock Cast iron exhaust manifold on 1985 C10

    Jon, I removed all emission equipment. But do have PCV connected of course. To answer your question. Headers by Summit (SUM-G9006) will fit our truck perfectly with Vortec heads I know this for a fact. As you know Vortec heads are slightly different than Gen 1 heads. Vortec exhaust runners are...
  8. Geoduck

    final prep for vortec head swap

    Andrew, not sure if you know the stock 86 manifolds on your truck will not fit your "new" vortec heads. If you got the vortec exhaust manifolds I'd be very curious if they fit your 86. In my case using 059 casting vortec heads on my 85 305 and need exhaust manifolds that fit. FWIW I strongly...
  9. Geoduck

    1996-2000 truck stock Cast iron exhaust manifold on 1985 C10

    I've installed vortec heads on my 1985 305. I'm aware the 85 stock exhaust manifolds don't fit correctly. My question is; will 1996-2000 Chevy GMC Truck Exhaust Manifolds fit my 1985 C10? Has anyone done this? I'd like to retain cast iron manifolds. As I understand it headers would add very...
  10. Geoduck

    Computer Control Quadrajet rebuild

    My error using the computer control to describe my 85 carburetor Rick. Again thanks for the clear easy to understand information. My carburetor is similar to the one Chris has. Also good to know about the pump shot. I've read a number of different things to do with this.
  11. Geoduck

    Computer Control Quadrajet rebuild

    Rick, I appreciated your detailed suggestions. After some research I was very confused. Come to find out the carburetor on my truck is not stock. It's the correct year but for a manual not automatic. Also its not an E4MD type. I'll finish the carburetor rebuild tomorrow but won't have the...
  12. Geoduck

    Computer Control Quadrajet rebuild

    Much appreciated Chad. :)
  13. Geoduck

    Computer Control Quadrajet rebuild

    Matt, I did in fact order a CCC kit from Cliff's. Should be here this weekend. :) Just removed the pieces after soaking overnight in 50-50 water pine-sol. Very clean and looks nice. Thanks for the tips everyone much appreciated! I am NOT an expert. Chad, if it fails to function correctly I...
  14. Geoduck

    Computer Control Quadrajet rebuild

    My new to me 1985 ran poorly but did run. I've removed the heads and started the Quadrajet rebuild. Just pulled to top off to find...... All 13 top plate screws were finger tight. It appears the pull-off man shaft was not through the choke lever hole inside the main body. In the pictures...
  15. Geoduck

    intermittent stall

    Second what Brian said about the glass fuel filter. John, it's a Quadrajet CC carburetor I'm assuming. If so the fuel bowl is small and can heat up. A non metallic spacer between the carburetor and intake could help. GM made a heat shield that fit our trucks. Both could be had for < $100.
  16. Geoduck

    Need a bit more oomph...

    Rusty says: "hold my beer here comes the N2O!" These threads are helpful reading peoples part choices and the factual experiences they encountered. Vortec heads have become expensive and must be closely screened for cracks but can provide exactly the power and torque our trucks need.
  17. Geoduck

    15X6 Rally Wheel or cheap steel wheel option?

    Yes, long bed half ton. In the morning I'll provide pictures of the wheel hole damage and galling as well as the galling on the tapered lug nuts.
  18. Geoduck

    15X6 Rally Wheel or cheap steel wheel option?

    Just found out my 85 long bed has non-center locating steel rims. I need four wheels and new tires. Used steel wheels are hard to find in my area. New ones are $$$$. Is there an alternative used steel wheel that dog dish hubcaps fit? Local junk yard has a set of 15X6 or 6.5 Rally Wheels under...
  19. Geoduck

    New guy from Tacoma, WA

    Welcome from Des Moines WA just north of you.
  20. Geoduck

    THM350C alternatives or keep it?

    Nick, I read much of what you had to share in the sticky area. Thanks for your useful answer, much appreciated. Will follow your suggestions. "1. Sonnax HD intermediate outer sprag race 2. 4L60E center support (drops right in, no mods needed) 3. Sonnax boost valve - replaces worn out factory...
  21. Geoduck

    THM350C alternatives or keep it?

    Recently bought an 85 long bed thinking it had a 700R4 with top two gears out. Turns out its a THM350C a lock-up type with two working gears. I was unaware there was a Lock-Up THM350C. What are your thoughts on this transmission? Should I have it rebuilt or go with a standard TH350 if that's...
  22. Geoduck

    Quadrajet Air Fuel Ratio

    Those vortec 906 heads the intake and SUM-1103 cam is a smart move. Great all around HP improvement using reliable components for not a lot of money. The one inch riser is something you will have to play around with. It would be my guess with a medium cam it could help? Once it's dialed in...
  23. Geoduck

    Header / exhaust pairing

    Is your 350 stock or near stock? I'm about to order Flowtech Headers 11500FLT for my modified 1985 305. After viewing some YouTube videos it seems the Flowtech are a good fit for your truck. 2-1/4 dual exhaust would be fine with a stock 350. Many folks want three inch exhaust but from what I've...
  24. Geoduck

    Chevy 305 heads

    As I understand it most came from trucks. Jim makes an important point. Many of those heads have developed cracks. I bought from a trusted automotive cylinder head machine shop to ensure no cracks or other issues.
  25. Geoduck

    Chevy 305 heads

    Travis, I'm in exactly the same situation you are now. 305 engine is bit over 200K and the heads badly need rebuilt. I got a pair of rebuilt Vortec heads. 520 and 059 Vortec castings flow amazing with small chambers that match 3.8 bore. Flowtech aluminum heads fit four inch bore with 64cc...

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