The Stupid Engine Questions Thread

[SUBURBAN5]

Normally on the front of the head behind the accessory brackets.

Maybe we can switch this conversation to your thread "Suburban down"

Agreed. sounds good

 

[cngodfather]

Why wont my damn truck idle under 1500 rpm? I am thinking a leak in the throttle body gasket am I on the right track? From what my buddy told me the truck doesn't really have any balls either. " I am in Iraq so I don't know" it is a 5.7 in a 94 silverado 4x4 with a 14 bolt rear. other than that everything else is stock mechanically.

Yeah I would start with any vacuum leak. tighten up the throttle body bolts, look for bad vacuum lines, bad iac, brake booster grommet dryrotted, etc. Bone stock it is weak anyway. High idle is usually vacuum leak somewhere.

 

[SUBURBAN5]

Can a 350 be converted to a 383?

 

[PlayingWithTBI]

Can a 350 be converted to a 383?

Yes, a 383 is a 350 block bored 0.030" over, with a 400 Cu in. stroke crank (3.75" as apposed to 3.48") The block has to be clearanced for the stroke of the crank. A little bit of machine work and you're good to go.

 

[SUBURBAN5]

Yes, a 383 is a 350 block bored 0.030" over, with a 400 Cu in. stroke crank (3.75" as apposed to 3.48") The block has to be clearanced for the stroke of the crank. A little bit of machine work and you're good to go.

Awesome thank you

 

[cngodfather]

Yes, a 383 is a 350 block bored 0.030" over, with a 400 Cu in. stroke crank (3.75" as apposed to 3.48") The block has to be clearanced for the stroke of the crank. A little bit of machine work and you're good to go.

I would like to add to this. If you are planning on doing this, you may want to look at other variables that my be an issue with your build. If you are doing a big build for a lot more torque - the transmission, gear ratio, and cam selection should match what you are doing. The 700r4/4l60 is kind of weak. If you are building for horsepower, other problems can arise on top of the previously mentioned items. Things such as, piston speed, fuel availability, rod length to piston height ratio, etc. But technically suburban5 is correct, if the only thing you are going to change is the displacement, the 350 can be a 383.

 

[SUBURBAN5]

I would like to add to this. If you are planning on doing this, you may want to look at other variables that my be an issue with your build. If you are doing a big build for a lot more torque - the transmission, gear ratio, and cam selection should match what you are doing. The 700r4/4l60 is kind of weak. If you are building for horsepower, other problems can arise on top of the previously mentioned items. Things such as, piston speed, fuel availability, rod length to piston height ratio, etc. But technically suburban5 is correct, if the only thing you are going to change is the displacement, the 350 can be a 383.

I'm just curious and looking at my options. Would would you think cheaper building my old vortec block to a 383 or just buying a gm crate 383?

 

[Erik the Awful]

For 95% of people I would say "buy a crate motor". You can build it yourself cheaper, but make one mistake and you're back inside it, and that second set of head gaskets just put you even with a crate motor. The upside of building yourself if that you can spread out your parts purchase over a few months so your wife doesn't notice. If your motor is already down, crate motor all the way.

 

[thegawd]

Erik, I like your reasoning. Cheers man!

 

[Erik the Awful]

Yeah, now notice that I've bought exactly zero crate motors in my lifetime. I can't just throw crap away, I feel the need to reuse it. Do as I say, not as I do.