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  1. 1

    Headers and O2 sensor

    Nice write up. Thank you. It all registers with me as truth nice writup. Thank you. I’m gonna stick with my stock manifolds. They’re in great shape. Now do I do 2.5” or 3”? Brian Harris at tbichips.com says 2.5” duals. AI says 2.5” for low end torque. The exhaust ports of the stock manifolds...
  2. 1

    Headers and O2 sensor

    Leaning this way. I like the headers since i could do my own dual exhaust. But thinking i will just pay for 3” stainless duals from the manifolds back. Thanks
  3. 1

    Headers and O2 sensor

    Yes TBI. 454/TH400. Stock manifolds
  4. 1

    Headers and O2 sensor

    I am considering putting headers on my 87 R30. Im looking for some experience with headers and the proper way to use an O2 sensor (what sensor, where to locate the sensor, and does it work well). Ive seen so many old trucks that run terrible. Mine runs perfectly and I dont want to mess it up. I...
  5. 1

    Which 4L80 for my swap

    Anyone have a link for how to perform the swap? I need info on the following: 1) tcu options 2) shift linkage mods 3) torque converter/flex plate 4) crossmember 4) transmission cooler lines 5) driveshaft resizing 6) transmission mount 7) exhaust mods
  6. 1

    Which 4L80 for my swap

    Ive read your posts and watched your videos. I’ll take your recommendation as gospel. Has anyone seen a guide to a swap like mine?
  7. 1

    Which 4L80 for my swap

    I have a 1987 chevy R30 454/TH400 TBI 3.73 standard cab. It has the camper options. I want a fully automatic overdrive. what year 4L80 is a best for my swap? Randy
  8. 1

    Vapor canister line

    I looked closer. It says egr on the top. There are two vacuum connections. One is capped and the other is open to the atmosphere. They are facing opposite directions. This egr is forward of the throttle body and mounted to the intake manifold. P.O. Jacked with the exhaust too. The cat is gone...
  9. 1

    Vapor canister line

    I’ll take a closer look when i get more time. There are definitely two vacuum nipples on the top. By the way, the truck is setting a code 32 and the cel is coming on. Im wondering if this is the cause. If it turns out to be the egr solenoid, i will need to track down where the vacuum line...
  10. 1

    Vapor canister line

    Awesome. Thank you so much for that. This is my first squarebody. The factory tubing was pulled off the throttle body and i wasnt sure where it connected. My next issue is the vapor canister has a 1/4” nipple but the factory tubing is a little smaller at about 5/32”. The factory tubing has an...
  11. 1

    Help with gauge cluster lights

    Yes, the light sockets are replaceable. There are at least two sizes. Be sure to measure yours. But I don't think they go bad very often. I just worked on my dash cluster. The problem I had was the dash lights would come on but I wanted them brighter. I bought LEDs and despite what everyone says...
  12. 1

    Vapor canister line

    Im finding all kinds of hacked up fixes. The plastics on this truck are brittle. This thing has a cap on one side and open to the atmosphere. What is this? And what does it connect to? Maybe there is a diagram of the emissions tubing for a 1987 R30 454/TH400 TBI?
  13. 1

    Vapor canister line

    Thanks. The tubing was hard and brittle. I bought some new tubing on amazon for like $6. I’ll take the air filter off and find where it goes on the throttle body
  14. 1

    Vapor canister line

    I have a 1987 chevy R30 7.4/TH400 TBI This line from the vapor canister is brittle and broken off. One end is still connected to the vapor canister as shown in the picture. But where does the other end connect??
  15. 1

    Aux battery for audio

    Hmmm…i didnt even think to look at the rating for the rock auto relay. I was thinking it was such a specific item how could they get it wrong. But youre right. Only rated for 30 amps. My alternator can put out 94 amps. Thanks for the heads up. I will switch it out. As for my original post, i was...
  16. 1

    Aux battery for audio

    I use everstart 800 cca
  17. 1

    Aux battery for audio

    The factory connections to the aux battery are for charging. They don’t carry the load for the audio system
  18. 1

    Aux battery for audio

    This is the purpose of the aux in a camper setup. I'm simply not doing a camper. I'm doing music. This is a problem not addressed with a single battery.
  19. 1

    Aux battery for audio

    yes and no. My alt is a factory unit pushing 94 amps. However, at 1100 WRMS, that's 76.4 amps just for the amplifiers. But yes, I may want to run the audio without the engine running and still be able to start my truck when ready. and Yes, it is a traditional camper load but not lights and...
  20. 1

    Aux battery for audio

    My installer had the same recommendation: update the alternator for most non-competition applications is all I needed. However, my existing alternator is strong, and it's cheaper to install the aux battery then to replace the alternator. And I can run the audio without running the engine.
  21. 1

    Aux battery for audio

    1100 WRMS. The DVC subs will be wired in parallel for a combined resistance of 1 ohm. Still working on how I want to set up the other speakers. The subs are on their own amplifier. 1100/14.4 = 76.4 amps (just for the amplifiers) My charging system is rock solid. I don't want to swap the...
  22. 1

    Aux battery for audio

    It's the factory ground. I don't work around wire enough to be able to tell the size by looking at it. It may be #8. Regardless, it is an accessory load. I plan to only run my new audio system (Radio and two amplifiers) off the aux battery. I got my replacement relay from Rockauto. It is a...
  23. 1

    Aux battery for audio

    No, There is a normal ground that runs to the engine block. This truck has 59K Miles. It's pretty clean. This ground on the core support is pretty hefty. I want to say it is more like a 10 gauge wire. Yes. This connection is pretty hefty too I concur with this statement.
  24. 1

    Aux battery for audio

    The diode type isolator sounds great. But I have no idea what to buy. If my cheap-o Rockauto relay fixes the low voltage issue, I will buy an aux battery identical to the starting battery.
  25. 1

    Aux battery for audio

    I appreciate your input. I snagged the last relay on Rockauto. It was even 50% off in closeout (woo hoo). It must be a sign. The negative terminal on the main starting battery is connected to the radiator support frame. The negative terminal for the aux battery is also connected to the radiator...

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