4.9 to 5.7 tbi - what do you think
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 13 of 13
5.0 and 5.7 Discussion, 4.9 to 5.7 tbi - what do you think in Cadillac Engine Technical Discussion; I have been thinking about how to get more power out of the 4.9, and the thought crossed my mind ...
  1. #1
    BigPmpn is offline Cadillac Owners Member
    Automobile(s): 1992 Eldorado
    Join Date
    May 2010
    Posts
    25

    4.9 to 5.7 tbi - what do you think

    I have been thinking about how to get more power out of the 4.9, and the thought crossed my mind that I could swap it out for a vortec 5.7 tbi engine out of a 1996-2000 Full Size Truck. I know I would need a tranny adapter for the different bellhousing, but otherwise, what would I be looking at?

    Do any motor mounts exist that will work?

    Will all the sensors work?

    Does anyone know the difference in dimensions between the two engines?

    Any info is appreciated. Thanks!

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Hogg is offline Cadillac Owners Member
    Automobile(s): Cadillac 1998 STS
    Join Date
    Nov 2008
    Location
    Woodstock Canada
    Posts
    98

    Re: 4.9 to 5.7 tbi - what do you think

    The 1996-2000 trucks never used a TBI 350, but they did use a CSFI Vortec 305 or 350.
    The 1996-2000 Vortec V8's use a different intake manifold that uses 8 vertical bolts, 2 at each corner rather than teh traditional 12 intake bolts. GM Performance Parts makes a Vortec head to TBI intake manifold that allows the 88-95 truck TBI unit to be used on a 1996-2000 Vortec 305/350.

    http://www.summitracing.com/parts/NA...5&autoview=sku

    peace
    Hog

  4. #3
    BigPmpn is offline Cadillac Owners Member
    Automobile(s): 1992 Eldorado
    Join Date
    May 2010
    Posts
    25

    Re: 4.9 to 5.7 tbi - what do you think

    Thanks for the info, Hogg. That will definitely help when I get to that point. This would be a project for next summer most likely, I'm just trying to get a feel for what's involved. My main concern is the overall dimensions of the different engines, I haven't been able to find that info.

    If anyone has done anything like this, let me know!

  5. #4
    Stingroo's Avatar
    Stingroo is offline Wagon/Audio Enthusiast
    Automobile(s): 92 Caprice Wagon | 01 Sonoma 4cyl 5spd | Past: 94 Fleetwood
    Join Date
    Jun 2009
    Location
    Stuart, FL
    Age
    23
    Posts
    16,982

    Re: 4.9 to 5.7 tbi - what do you think

    What's the torque on the 4.9? That would be really cool. The 350 TBI also is rated at 200 horsepower (I suspect more, though..) and 300 lb/ft of torque.

    The Vortec 350's are a bit higher though. I would love to do vortec heads and intake for the wagon... maybe next summer.

  6. #5
    Rodya234's Avatar
    Rodya234 is offline Cadillac Owners Connoisseur
    Automobile(s): 1998 Seville STS / 2013 Chevrolet Impala
    Join Date
    May 2008
    Location
    Chicago, IL
    Age
    21
    Posts
    1,889

    Re: 4.9 to 5.7 tbi - what do you think

    Quote Originally Posted by Stingroo View Post
    What's the torque on the 4.9? That would be really cool. The 350 TBI also is rated at 200 horsepower (I suspect more, though..) and 300 lb/ft of torque.

    The Vortec 350's are a bit higher though. I would love to do vortec heads and intake for the wagon... maybe next summer.
    The L26 4.9L is rated at 275lb-ft of torque @ 3000 rpm.


    The biggest problem I would see is that the 4.9L/4T60-E is a FWD drivetrain, and the 5.7L might not fit into the engine bay mounted transversely. It's pretty cramped in there already.

  7. #6
    Stingroo's Avatar
    Stingroo is offline Wagon/Audio Enthusiast
    Automobile(s): 92 Caprice Wagon | 01 Sonoma 4cyl 5spd | Past: 94 Fleetwood
    Join Date
    Jun 2009
    Location
    Stuart, FL
    Age
    23
    Posts
    16,982

    Re: 4.9 to 5.7 tbi - what do you think

    No way. There's a LOT of room under my hood. I assume the Caddy engine bay is just as large.

    Not sure on the Eldo though.

  8. #7
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Location
    Rockford, IL
    Age
    47
    Posts
    7,490

    Re: 4.9 to 5.7 tbi - what do you think

    An LT1 maybe, but not a conventional 350 Small Block, too long, the waterpump/belt accessory drive is too long and sticks out. The LT1 is far more compact there. But the trans will never survive long, the diff is too weak.

    Quote Originally Posted by Stingroo View Post
    No way. There's a LOT of room under my hood. I assume the Caddy engine bay is just as large.

    Not sure on the Eldo though.

  9. #8
    Stingroo's Avatar
    Stingroo is offline Wagon/Audio Enthusiast
    Automobile(s): 92 Caprice Wagon | 01 Sonoma 4cyl 5spd | Past: 94 Fleetwood
    Join Date
    Jun 2009
    Location
    Stuart, FL
    Age
    23
    Posts
    16,982

    Re: 4.9 to 5.7 tbi - what do you think

    ^ Ahoy. Engine master returns. Long time no see around here.

  10. #9
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): none
    Join Date
    Oct 2004
    Location
    WI
    Posts
    5,279

    Re: 4.9 to 5.7 tbi - what do you think

    As far as size, also consider the overall width and height of the engines. The 4.9 is surpisingly compact with it's odd geometry (the reason why the 4.9 pushrods go through the intake manifold, not the head) and still it's a snug fit in the FWD engine bays.

    I'm going to go ahead and say that 0hp and 25 ft/lbs isn't worth the large effort needed to complete this project.

  11. #10
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Location
    Rockford, IL
    Age
    47
    Posts
    7,490

    Re: 4.9 to 5.7 tbi - what do you think

    The 350 has of course 10x more go fast goodies than a 4.9 ever will, but you run into weight being more and the trans can't handle it. The 4T65E HD is in the 5.3L FWD SS cars now, which is a nice 303 hp, and very heaviliy torque managed to make the trans live. The diff is the weak link. No wheel spinning! Very important on them, else they explode. The diff is like 6-7 inches. Tiny thing....

    Take a stock 210 hp 350 and toss on Vortec heads and a mild cam, and you are way over 300 hp easily. No other changes. Think of it this way, a 5.7L 350 with a LT4 hot cam and vortec heads and good exhaust is a way to make easy 350 hp and still have reasonable street manners. But not in a front wheel drive....

    Quote Originally Posted by drewsdeville View Post
    As far as size, also consider the overall width and height of the engines. The 4.9 is surpisingly compact with it's odd geometry (the reason why the 4.9 pushrods go through the intake manifold, not the head) and still it's a snug fit in the FWD engine bays.

    I'm going to go ahead and say that 0hp and 25 ft/lbs isn't worth the large effort needed to complete this project.

  12. #11
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Location
    Rockford, IL
    Age
    47
    Posts
    7,490

    Re: 4.9 to 5.7 tbi - what do you think

    Finally! I am hanging around 3800pro.com and fullsizechevy.com and monodax.com a lot lately, but still lurk around!!! I need to get involved here some more. My Cad is hopefully going to get on the road here shortly again! I miss it a lot. My 3800 SC Buick is ok, but it is no Cadillac. I miss my V8 RWD. Being I am not daily driving it, might go ahead and complete the 9C1 suspension and do some engine mods.... See how much I can do on a 250k mile LT1! I have the 3.42's to put back in and might go with 3.90's.... Ahhh the fun. I want to do a larger cam anyway, the shorter gears really need it. And a looser converter.... I might just go racing and have some fun with a Cadillac Fleetwood!!!


    Quote Originally Posted by Stingroo View Post
    ^ Ahoy. Engine master returns. Long time no see around here.

  13. #12
    Stingroo's Avatar
    Stingroo is offline Wagon/Audio Enthusiast
    Automobile(s): 92 Caprice Wagon | 01 Sonoma 4cyl 5spd | Past: 94 Fleetwood
    Join Date
    Jun 2009
    Location
    Stuart, FL
    Age
    23
    Posts
    16,982

    Re: 4.9 to 5.7 tbi - what do you think

    I want to get into modding the wagon, both cosmetically and performance wise, and I remembered the vortec heads from your posts here.


    Now if only I can find a decent job in this crappy Floridian economy, I would be in business. Good to see you around though.

  14. #13
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Location
    Rockford, IL
    Age
    47
    Posts
    7,490

    Re: 4.9 to 5.7 tbi - what do you think

    I hear ya! It sucks here, 20-25% unemployment locally here. I was commuting 75 miles each way since 2002 till I got canned last month.

    The Vortec heads are vastly superior to the L05 heads, and the cam is ancient grind, so the 2 of them with the decent bottom end the L05 has (truck one would be better given a choice), can make a screamer.

    I have sorta got to a point where flow is most important.

    But given a budget? I would look to another choice...

    Lets see $700 for a upgrade.

    Get a $400-$500 LM7 truck 5.3L engine. Starts off with 300 hp.... And more efficient and a bottom end you would have a hard time killing no matter what you did to it.

    I'll help out with the PCM tuning for it to keep you in budget if that is what it takes... The new engines are sooo much better....

    Quote Originally Posted by Stingroo View Post
    I want to get into modding the wagon, both cosmetically and performance wise, and I remembered the vortec heads from your posts here.


    Now if only I can find a decent job in this crappy Floridian economy, I would be in business. Good to see you around though.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting