Author Topic: 305 TBI to 350 TBI  (Read 6417 times)

Offline Unofficial

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305 TBI to 350 TBI
« on: May 14, 2008, 09:11:10 pm »
I just bought a 350 last night for $100, and I'm going to drop it in this truck.

It currently has a 305 TBI with 83k on it.

Here it is under the hood:


Like I said, I bought this 350 that came out of an '88 for $100. I'm not sure how many miles it has on it. This is after I took off the intake, rocker arms, pushrods, and lifters.


I'm going to take off the heads this weekend to inspect them and make sure they don't need any work done. I'm going to check the cylinders for a ridge so I can determine whether or not I want to get them bored out. I'll pull the 305 out and put the headers on the 350 and then I'll use all the parts from the 305 like the starter, throttle body, intake, etc... My dad is going to help me with all of this, seeing as though I'm just a 16 year old going to school and working at a restaurant part time :D

I'm really excited, because I took an engines class and now I know what's going on. A couple Summers ago my dad and I pulled out the 289 in our '65 Mustang and rebuilt the whole thing, but back then I didn't know about anything in a motor. So now I'll know what he's talking about when we take this apart. This isn't going to be done very fast, because I have school and work. The restaurant I work in is expanding, so I'll be pretty busy. Especially this summer. Thanks for checking this out! I'll update soon!
1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline Leevon

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Re: 305 TBI to 350 TBI
« Reply #1 on: May 14, 2008, 11:31:41 pm »
nice find, keep us posted!
1950 3100
1971 Cheyenne
1987 Silverado
2018 Silverado

Offline Unofficial

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Re: 305 TBI to 350 TBI
« Reply #2 on: May 18, 2008, 10:10:44 pm »
I stripped the whole thing down. Heads, cam, crank, pistons, pretty much everything down to the bare block. I'm pretty sure it's been rebuilt before, because the bearings inside the mains say .010 on them, which means the crank has been ground down. I'm taking the block to a guy who can clean it, bake it, and hone the cylinders for about $100. He's going to do some work to the heads as well, which are in pretty good shape, even though some new ones would be sweet :D

I'll post pictures later.
1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline comp

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Re: 305 TBI to 350 TBI
« Reply #3 on: July 27, 2008, 11:17:55 pm »
is it a roller block ???

Offline Unofficial

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Re: 305 TBI to 350 TBI
« Reply #4 on: August 03, 2008, 09:53:53 am »
Comp, do you mean a roller cam? Then no. I don't know much about valvetrain stuff though. The motor is completely rebuilt, bored over, and cleaned up on the inside with many new parts. I got a flat tappet cam from summit, new lifters, gaskets, and an oil pump. I put the lube that came with the cam on the bearings. Everything is in and ready to go. I'm going to put on an intake, and brush the engine down and clean it with a power washer. Then I'll paint it, and I can start worrying about getting the 305 out. One question though, is there anything I should know about breaking in the motor once I get it in? I heard something about changing the oil after it runs and something about an additive that needs to be added to the oil because of the new cam? ???

I don't know.
1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline comp

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  • 76-77-78
Re: 305 TBI to 350 TBI
« Reply #5 on: August 03, 2008, 08:04:18 pm »
ya that was what i wondered

Offline 82Shortbed

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Re: 305 TBI to 350 TBI
« Reply #6 on: August 03, 2008, 08:27:25 pm »
One thing you may want to take note of. Whether it's important to you or not, if you're keepin the TBI Setup, make sure you get a 350 knock sensor and I THINK it's the Spark Control sensor, they're cubic inch sensitive from what i remember
'82 Custom Deluxe
350, 882s, stock cam...For Now