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Username Post: Motor swap        (Topic#349990)
The burbonator 
Forum Newbie
Posts: 6

Reg: 02-02-18
03-07-18 06:13 PM - Post#2726790    

Hey guys, I am thinking about pulling the 454 out of my 88 burb and going a different route with it. There are a few nice 383 strokers near me I have been looking at and I was curious if anyone has any advice on the swap or info on conversions they have done.



 
75gmck25 
Contributor
Posts: 377

Loc: Alexandria, VA
Reg: 12-25-07
03-08-18 06:39 AM - Post#2726849    
    In response to The burbonator

You will probably get some suggestions to use another 454, but I think you can get more for your money by using a 383 stroker. Most stock 454's are boat anchors, and it takes more investment to make them a performance motor.

When you are looking at SBC engines, I strongly suggest you pass by anything with stock 1st generation heads, TBI heads, or any other variation. They don't flow well from the factory, and even when ported and modified they can barely keep up to a stock Vortec head. Use Vortec iron heads, or one of the reasonably priced aluminum heads, and shoot for compression at about 9.0-9.4.

I also suggest that you will have a lot easier time with cam selection if you use a roller cam (retrofit or stock). Roller lifters will tolerate high lift, aggressive ramps, 1.6 rockers, and other features that are common in modern performance cams. If you use a flat tappet cam you will either have to stay with grinds that are designed for flat tappets, or risk wiping a lobe because your cam is too aggressive.

Bruce



 
1983G20Van 
Super Senior Member
Posts: 3699

Loc: Bedford, Texas, USA
Reg: 11-13-02
03-08-18 08:26 AM - Post#2726861    
    In response to 75gmck25

I will strongly suggest you will be happier keeping a big block in that heavy suburban. While a small block can certainly be snappy, to get good power out of it the compression ratio will need to be in the 10:1+ range which will require premium fuel. A healthy small block is still going to drink fuel in that truck. The stock bottem end of a 454 can hold a ton of power so long as you are not spinning it 6K all the time. Rebuild the bottem end back to stock spec with a cleanup bore and turn the crank if needed. Then find you some smaller chamber aftermarket aluminum heads. They are very affordible now. Then pickup a mild cam for it. I am going to assume you plan on converting to a carb? Run a dual plane intake like the performer rpm with a good Q-Jet on top with a HEI.

Option 2 would be an 8.1/4L85E swap. GM performance parts makes a nice little roller cam used in the 454/502 HO that is very afforidble that will really wake up an 8.1.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
raycow 
Honored Member
Posts: 27439
raycow
Loc: San Francisco, CA
Reg: 11-26-02
03-08-18 08:54 AM - Post#2726865    
    In response to The burbonator

I agree completely with 1983G20. There used to be an expression, "The only substitute for cubic inches is cubic dollars". While this may no longer be true for HP, it is still very much true for torque, and torque is what you should be going after, not HP.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
1983G20Van 
Super Senior Member
Posts: 3699

Loc: Bedford, Texas, USA
Reg: 11-13-02
03-08-18 10:12 AM - Post#2726879    
    In response to raycow

  • raycow Said:
I agree completely with 1983G20. There used to be an expression, "The only substitute for cubic inches is cubic dollars". While this may no longer be true for HP, it is still very much true for torque, and torque is what you should be going after, not HP.

Ray



The alternative to cubes is forced induction, however that can get $$$$ quick and is by no means as reliable.

4.8 + 4L80E and some boost could make for a nice running setup.

Then again keep the 454 low compression, add some aluminum heads a blower cam and put a weiand 177 on it. Would give you nice driveability and still make power when you put your foot into it.

Here is a perfect example of what can be done with a mild big block build. Even running on 87 without the blower it was making nearly 600 ft/lbs of torque and well over 500 hp. With the blower and only 3 psi of boost it made nearly 700 ft/lbs. 383 will not come close to making those power numbers.

http://www.superchevy.com/how-to/0610ch-big-blo ck-...

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 03-08-18 10:26 AM. Reason for edit: No reason given.

 
The burbonator 
Forum Newbie
Posts: 6

Reg: 02-02-18
03-08-18 04:21 PM - Post#2726914    
    In response to 75gmck25

Yeah I was hoping to keep the downtime to a minimum on the truck and for the price of rebuilding the 454 from the block up I can buy a built 383/396 do the swap, unload the 454 on Craigslist, and be making an extra 150hp 100lb torque at around the same fuel economy



 
gchemist 
Senior Chevytalk Moderator
Posts: 24319
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-11-18 06:10 AM - Post#2727182    
    In response to The burbonator

If your budget had no limits, a 6.0 or 6.2 LS would make that sub fly.

https://www.youtube.com/watch?v=JQA0XYNI8Po



'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
1983G20Van 
Super Senior Member
Posts: 3699

Loc: Bedford, Texas, USA
Reg: 11-13-02
03-12-18 04:01 AM - Post#2727279    
    In response to gchemist

  • gchemist Said:
If your budget had no limits, a 6.0 or 6.2 LS would make that sub fly.

https://www.youtube.com/watch?v=JQA0XYNI8Po





I have really not been impressed with those for power. I have a LQ4 6.0L with 317s milled 0.020", LS6 cam, Trailblazer SS intake manifold and shorty headers in a 1987 G20 van. It pulls the van pretty well but a LT4 Hotcam in a Vortec 350 has more power earlier in the rev range and makes almost as much top-end too.

I ran a 2014 6.2 crew cab 1500 chevy truck atleast 4 times when I took my 2014 crew cab Titan to the track. I ran consistent 9.4-9.5s bone stock and outran that 2014 6.2 all night long.

But the main reason I am not impressed with the 6.0L is the fact I picked up an 8.1 for less money, it cost me less to cam, less to swap, bolted in on stock mount pads, and outperforms the 6.0L in every way possible. The big block setup has a 2.73 rear gear vs the 3.08 the 6.0L has. Neither really have enough miles yet to have a real good idea on fuel mileage, but I can say the 8.1 really does not do much if any worse than the 6.0L when driven with a light foot. In a little drag race, the mild cammed 8.1 makes a cammed 6.0L look like a school bus powered by a 305 by comparison. Big block headers for your year suburban are also cheaper than LS swap headers. You could also even bolt the stock 454 manifolds and exhaust to the 8.1.

Here is a random 8.1 burnout, lol.

https://www.youtube.com/watch?v=bcWiQd3Xy1g

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 03-12-18 08:17 PM. Reason for edit: No reason given.

 
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