tbi 350 swap
05-14-2014, 09:15 PM
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Car: 1985 TA
Engine: 350 Carb
Transmission: T56
tbi 350 swap
I recently posted that I was getting a 1997 350. well turns out its a 1991 tbi 350 from a full size Blazer. Im not sure what to do. I have my LT! T56 to put with this engine and a 4.11 posi rear to install at the same time. I have a little bit of money set aside for this. I am hoping to get suggestions as far as keeping my TPI or going carb. Also I'd like to do a cam swap while the engines out. Not sure whats the best route to go with this setup. Am looking for good streetable power.
05-14-2014, 09:41 PM
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: tbi 350 swap
get a 350 TPI memcal (tune ) and knock sensor to put into your existing ECM
Read link regarding head differences
https://www.thirdgen.org/forums/engi...-manifold.html
05-15-2014, 02:37 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The real issue is what heads to use. The 350 TBI heads are probably okay for a stock TPI setup, but if you upgrade the TPI or go carb, they will become the limiting factor pretty quickly.
A simple solution would be to put your '85 305 heads on the 350. It should have dished pistons, so static compression shouldn't be too high. Your '85 TPI cam & lifters would be an upgrade from the truck cam as well (assuming they are in good condition).
Since you thought you were getting a '97 engine, you apparently thought you were getting Vortec heads. If you go carb and a cam upgrade, this kit would be a good value to get the good street performance you're looking for: https://sdparts.com/details/scoggin-...nter/sd8060aag
They used to offer the upgraded heads/gaskets/bolts/rockers without intake, but I don't see it on their site now. You could call and ask if they would still do that for you. With a Holley Vortec Stealth Ram intake, that would make a good performing package with a nice cam upgrade.
Speaking of cam, you might want to try to go with a roller cam, if the 350 is machined/drilled/tapped for it. The truck block casting has the provisions for it, but they weren't always finished machined, since the trucks got flat tappet cams.
A simple solution would be to put your '85 305 heads on the 350. It should have dished pistons, so static compression shouldn't be too high. Your '85 TPI cam & lifters would be an upgrade from the truck cam as well (assuming they are in good condition).
Since you thought you were getting a '97 engine, you apparently thought you were getting Vortec heads. If you go carb and a cam upgrade, this kit would be a good value to get the good street performance you're looking for: https://sdparts.com/details/scoggin-...nter/sd8060aag
They used to offer the upgraded heads/gaskets/bolts/rockers without intake, but I don't see it on their site now. You could call and ask if they would still do that for you. With a Holley Vortec Stealth Ram intake, that would make a good performing package with a nice cam upgrade.
Speaking of cam, you might want to try to go with a roller cam, if the 350 is machined/drilled/tapped for it. The truck block casting has the provisions for it, but they weren't always finished machined, since the trucks got flat tappet cams.
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