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  1. McSweeney

    Weird cooling system cool down vortec 5.0

    Yea i see what you guys are saying, it does just seem like its due to the coolant being heated after shutting down, however it happens as soon as i shut the engine off so i dont know. A coolant flush obviously couldn’t hurt so ill plan on that, been so busy working ill try and test the coolant...
  2. McSweeney

    Weird cooling system cool down vortec 5.0

    A decent amount, kind of a cycle of a few bubbles then a pause, does it for a minute or 2 while it cools off
  3. McSweeney

    Weird cooling system cool down vortec 5.0

    Oil is always clean, no water whatsoever. No smoke out of tailpipe. The 185 is from reading the coolant temp sensor. Quite a lot of bubbles. Like maybe 10 bubbles then stops for a second, then starts again in a cycle for a minute or so. It only does it when the engine shuts off. It really seems...
  4. McSweeney

    Weird cooling system cool down vortec 5.0

    It runs at about 185-190 and holds very well. I dont honestly know if the water jackets been flushed but i highly doubt it. Ive replaced the water pump, thermostat and hoses so it has mostly new fluid. Id have to check the protection of the coolant
  5. McSweeney

    97 vortec 305 intermittent low power, poor mpg rough idle in park.

    Haha yea it is hard to diagnose on a forum. Probably is a headgasket failing, guess ill just get to that when it totally fails. It has a new cat, and a new temp sensor. I might be chasing a couple different issues that i think are related which i know better than to do. This truck is great but...
  6. McSweeney

    Weird cooling system cool down vortec 5.0

    Ive replaced it twice, the current one is gm genuine
  7. McSweeney

    Weird cooling system cool down vortec 5.0

    I have a 1997 c1500 5.0 vortec and after running the truck and shutting it down i get bubbles in the reservoir from the overflow hose from the rad. It only happens when the truck shuts down, and i dont actually lose any fluid. Its almost like a quarter of a quart just pushes back out of he...
  8. McSweeney

    97 vortec 305 intermittent low power, poor mpg rough idle in park.

    I have a 97 c1500 5.0 vortec it has weak acceleration, poor idle, and horrible mpg. Ive replaced a lot on this engine including all ignition except for the distrutor, and upgraded the injectors to mfi. Still feels the same. Once in a while it will feel better like it has good power again, but...
  9. McSweeney

    Possible vacuum leak not sure need help

    Meant vacuum, so if i test my truck it should measure out to around 14 for my vacuum
  10. McSweeney

    Possible vacuum leak not sure need help

    Ok thanks everyone, it seems perfect to me thats why i was so freaked out. Yea so the map sensor doesnt read actual intake man pressure so ill test it with a vacuum tester and report back. I took off a couple vacuum lines and it sucks harder than a 2$ ****** lol so i think im good and the engine...
  11. McSweeney

    Possible vacuum leak not sure need help

    So i have a 97 305 vortec that I replaced spider injectors on and i never bothered to check the intake manifold pressure prior to install. So after i checked it with one of those fixd scanners and map is reading 4psi at idle which from my experience is way too low. Replaced map and nothing...
  12. McSweeney

    Engine oil

    Jesus who knew some guys could get so heated over motor oil lmao, anyway thanks for the input everyone! Odds are since i change my oil so frequently it reallt doesnt matter just wanted to hear what yall had to say. I think i am gunna stick to valvoline with the maxlife high mileage **** bc they...
  13. McSweeney

    Engine oil

    Also im torn between amsoil and valvoline, honestly i dont really care how long i can go on a synthetic i just want an oil that will lubricate the engine the best with minimal breakdown. From the chart it still definitely looks like amsoil is better but idk valvoline seems like a great choice too
  14. McSweeney

    Engine oil

    Yea im just gunna stick with the 1030, the manual says you can use it so ill just do that. Im not positive whats making the ticking, i thought it was lifters but my gut is telling me that the manifold has a crack somewhere which is causing the tick. I replaced my cat and i heard it after that so...
  15. McSweeney

    Upgrading to mpfi should i do the lower intake gasket?!

    Awesome thanks so much everyone!!! yea alpinecrick odds are it probably was already replaced so I probably should just leave it alone because i might break more stuff then its worth so my 5.0 is great and all and i know theyre pretty comparable reliability wise with the 350, does anyone know...
  16. McSweeney

    Upgrading to mpfi should i do the lower intake gasket?!

    yea you’re right i should probably leave it alone and just do the injectors, i have bad luck with fixing things that didnt need fixing lol. also, how many miles did u get on that motor? Ive got 202k on ky 305 right now and it runs great im just getting a little worried itll throw a rod or...
  17. McSweeney

    Upgrading to mpfi should i do the lower intake gasket?!

    Hi so i just got my new mfi spider injectors and I realized that these trucks are infamous for the lower intake manifold gasket leaking. To put the injectors in you have to take most of the stuff off that is needed to do the gasket job so would it be wise to do it too? I only ask because i...
  18. McSweeney

    Engine oil

    Whats so special about amsoil? And should i not use that napa oil? also how do i get my oil analyzed
  19. McSweeney

    Engine oil

    Ok, well i just went to napa and they were out of mobile 1 synthetic so i picked up the napa synthetic 10w30 which they say is made by valvoline, i did some research and it is, but its not. Valvoline uses different additives so idk if i wanna put this oil in my high mileage truck. Any...
  20. McSweeney

    Engine oil

    Well either im going crazy or i think im beginning to get a little lift tap in the rear of the block, so should i run thicker oil since its so hot? It only started since its been 90 degrees out
  21. McSweeney

    Engine oil

    Ok this one is pretty simple fellas, so my truck has 202k on the clock, and runs great. But i do worry about the motor so ive used 10w30 synthetic for a while. My boss used that in his 350 so he said it would be good in mine. My question is, for the summer should i use something thicker like...
  22. McSweeney

    Positive terminal ground straps

    Hey so i noticed that my ground strap that connects to the frame on my 97 broke and im not sure where it goes to or even where to buy a new one. So what im seeing is that there is a ground strap that goes from the frame to the firewall, which looks easy enough to replace. But the other one...
  23. McSweeney

    305 to 350 l98 swap

    Awesome thank you! Sent from my iPhone using Tapatalk
  24. McSweeney

    305 to L98 350 swap

    Yea that works, i was thinking about buying a vortec 350, but i figured since im just reusing the block it might not matter? But yea maybe i should keep the motor for something special
  25. McSweeney

    305 to L98 350 swap

    Hey so my truck has the vortec 305 with cpfi. I just bought a L98 4 bolt main 350 from an 86 c20. So my idea is to throw out almost everything exept the block obv and covert it to a vortec with mpfi. So i know that the late 90s 350 vortec heads will bolt right up to the block and then i need to...

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