TPI from my 305 to a 383
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From: Kittery, ME
Car: '87 IROC
Engine: Puny 305
Transmission: 5sp
Axle/Gears: 3.08 LSD
TPI from my 305 to a 383
Ok... I just want to say that I actually like the looks of the TPI set up.
Long term plans call for the extraction of this wimpy 305 and the insertion of a nice 383. With a budget to go by, I'm interested in using as much stuff off the stock motor as I can. One of the things I'd love to reuse is the TPI system, with a custom programmed ECM of course. Anyone know if this is at all possible? I know I'll need bigger injectors and some pretty hefty fuel pressure. Anything else I should look at?
Long term plans call for the extraction of this wimpy 305 and the insertion of a nice 383. With a budget to go by, I'm interested in using as much stuff off the stock motor as I can. One of the things I'd love to reuse is the TPI system, with a custom programmed ECM of course. Anyone know if this is at all possible? I know I'll need bigger injectors and some pretty hefty fuel pressure. Anything else I should look at?
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From: south Louisiana
Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
oh boy, this should be fun....
1st off ill say, if your on a buget go with a 355. because youll be able to reuse most of the stock 350 peices.
2nd; how much money are you ready to spend?
3rd; for basics youll need at least 22# injectors, and a L98 knock sensor and a L98 esc(electronic spark control) module.
1st off ill say, if your on a buget go with a 355. because youll be able to reuse most of the stock 350 peices.
2nd; how much money are you ready to spend?
3rd; for basics youll need at least 22# injectors, and a L98 knock sensor and a L98 esc(electronic spark control) module.
Joined: Sep 2004
Posts: 2,777
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From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Use a Holley Stealth Ram intake but re-use the original wiring and such. It's a wonderful improvement. Your stock intake can't even let your 305 see it's full potential, much less a larger replacement!
Good luck!
Good luck!
If you want to keep the TPI look a stealth ram isn't viable.
The 305 TPI setup would be perfectly comfortable on a 383. A small block is a small block. You'd need more fuel, a set of 24lb injectors would get the job done. A different knock sensor, and some custom tuning to the prom would be in order to get the most out of it.
To get the most power out of the engine, you'll want to upgrade most of the intake system, which can be expensive, but it all comes down to what you want.
The 305 TPI setup would be perfectly comfortable on a 383. A small block is a small block. You'd need more fuel, a set of 24lb injectors would get the job done. A different knock sensor, and some custom tuning to the prom would be in order to get the most out of it.
To get the most power out of the engine, you'll want to upgrade most of the intake system, which can be expensive, but it all comes down to what you want.
Thread Starter
Junior Member
iTrader: (1)
Joined: Oct 2006
Posts: 19
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From: Kittery, ME
Car: '87 IROC
Engine: Puny 305
Transmission: 5sp
Axle/Gears: 3.08 LSD
oh boy, this should be fun....
1st off ill say, if your on a buget go with a 355. because youll be able to reuse most of the stock 350 peices.
2nd; how much money are you ready to spend?
3rd; for basics youll need at least 22# injectors, and a L98 knock sensor and a L98 esc(electronic spark control) module.
1st off ill say, if your on a buget go with a 355. because youll be able to reuse most of the stock 350 peices.
2nd; how much money are you ready to spend?
3rd; for basics youll need at least 22# injectors, and a L98 knock sensor and a L98 esc(electronic spark control) module.
2) I'm looking at about $5K for the motor. I've done enough research that I know I can pull that off. I've probably got another $1500 above that. I expect a lot of DIY custom stuff to have to be done in my free time.
3) Is the L98 the TPI 305?
If you want to keep the TPI look a stealth ram isn't viable.
The 305 TPI setup would be perfectly comfortable on a 383. A small block is a small block. You'd need more fuel, a set of 24lb injectors would get the job done. A different knock sensor, and some custom tuning to the prom would be in order to get the most out of it.
To get the most power out of the engine, you'll want to upgrade most of the intake system, which can be expensive, but it all comes down to what you want.
The 305 TPI setup would be perfectly comfortable on a 383. A small block is a small block. You'd need more fuel, a set of 24lb injectors would get the job done. A different knock sensor, and some custom tuning to the prom would be in order to get the most out of it.
To get the most power out of the engine, you'll want to upgrade most of the intake system, which can be expensive, but it all comes down to what you want.
Which part of the intake system will need upgraded? Manifold? Runners? TB?
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From: south Louisiana
Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
the L98 is the 350 TPI. i recomend that you find a 87 on up L98(for the roller cam). sorry i didn't ask earlyer, but how much HP are you looking for, or better yet what kind of 1/4 mile times are you looking for? if you only replace one part of the intake, id replace the base. for your base, get either the edlbrock, or the TPIS base. edl is the only company that makes the base anymore, and TPIS exrude hones the edl base, and then sales that. ill tell you now there is no better (out of the box) base then the TPIS base. what kind of heads where you looking to get for it?
Pretty much all of it. It's a matched system, so unless you upgrade all of it, you won't feel much improvement. You can port everything, but by far the weakest link is the base plate. The TB won't become a restriction until after the manifold, runners, plenum. You can bandaid the TB with a airfoil, and the plenum with porting.
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Joined: Dec 2004
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From: my garage
Car: 84 firebird T/A
Engine: shinny 350
Transmission: slush box L65
Axle/Gears: Torsen "3.73"
tpi 383 450 hp 15,000
http://i56.photobucket.com/albums/g1...ski/car018.jpg
http://i56.photobucket.com/albums/g1...ski/car018.jpg
Senior Member
iTrader: (1)
Joined: Apr 2006
Posts: 562
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From: south Louisiana
Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
tpi 383 450 hp 15,000
http://i56.photobucket.com/albums/g1...ski/car018.jpg
http://i56.photobucket.com/albums/g1...ski/car018.jpg
nice. what all do you have in it? what kind of times are you running? and does that mean you spent 15,000 on the motor or the car?
Thread Starter
Junior Member
iTrader: (1)
Joined: Oct 2006
Posts: 19
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From: Kittery, ME
Car: '87 IROC
Engine: Puny 305
Transmission: 5sp
Axle/Gears: 3.08 LSD
tpi 383 450 hp 15,000
http://i56.photobucket.com/albums/g1...ski/car018.jpg
http://i56.photobucket.com/albums/g1...ski/car018.jpg
Your intake brings up another question I have that relates to this topic. Is there a way to put cone filters down into the stock "air box?" I love the looks of the intake going forward of the radiator. I've got some K&N drop in filters in there now, but one can never have enough air flow.
Senior Member

Joined: Dec 2004
Posts: 556
Likes: 0
From: my garage
Car: 84 firebird T/A
Engine: shinny 350
Transmission: slush box L65
Axle/Gears: Torsen "3.73"
Senior Member
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Joined: Apr 2006
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From: south Louisiana
Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
was that a crate motor? even though its 450 HP. i dont see how it could cost that much.
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From: Kittery, ME
Car: '87 IROC
Engine: Puny 305
Transmission: 5sp
Axle/Gears: 3.08 LSD
I would be the last person to take anything away from the car. It looks gorgeous. I'm curious, though, why there's no interior shots. Surely the paint, smoothing, engine, and suspension didn't come up to $50K. That's a big price tag. I know guys that do paint jobs like that for $5K. That suspension set up... I've seen the like for $1K. Smoothing... I'll be generous and say $2K. Given $15K for a motor, that totals out to $23K. Where's the other $27K worth of goodies?
Senior Member
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Joined: Apr 2006
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From: south Louisiana
Car: 1985 Z28
Engine: 85 L98
Transmission: 700r4
Axle/Gears: stock 10 bolt-3.73 eaten posi
i would say that the paint was more, concedering that the engine bay looks painted. that takes a lot of time and money to do all that.
Thread Starter
Junior Member
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Joined: Oct 2006
Posts: 19
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From: Kittery, ME
Car: '87 IROC
Engine: Puny 305
Transmission: 5sp
Axle/Gears: 3.08 LSD
Oh yeah... I found this at Scoggin-Dickey:
http://www.sdpc2000.com/catalog/120/...inum-Heads.htm
Given my $5K budget, I could grab that and have $200 left over for upgrades to the intake system. And tweaking this out to 450HP would NOT set me back another $10K!
Last edited by SpeedKnight; Nov 29, 2006 at 06:57 PM. Reason: Found some new info...
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