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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. McSweeney

    305 to 350 l98 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...
  9. McSweeney

    4L60E leaking from either front seal or pump gasket

    Hi i have a 97 c1500 with a 4L60E trans and i though it was leaking from the pan but upon closer inspection, i realized its leaking from right above it. Looks like its right by the bottom 2 bolts for the front pump. The transmission was just rebuilt and i would take it back but its 4 hours away...
  10. McSweeney

    Knocking from cat could use some help

    I have a 97 c1500 with the 305...shes got 200k on the clock and runs great but im hearing a very slight knocking from the passenger cat. Its not like a broken honeycomb that rattles around it sounds more like engine knock but im only hearing it from this cat. Oil pressure is good. I have noticed...
  11. McSweeney

    97 c1500 farm truck

    This is my baby, also a black hole where i throw my money...shes got a million dents, and 198k miles...needs a new transmission soon. Anyone got any tips on what i should do to keep the motor runnin? To just the motor ive done a full tune up with plugs, wires, cap/rotor, air filter, pcv valve...

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