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  #1  
Old 07-27-2005, 12:19 AM
turbopowered68 turbopowered68 is offline
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Default 4.1 Vs 3.8

I Have A 150k Mile 1987 Gn Motor In Need Of A Rebuilt My Brother Just Gave Me A 1984 Totaled Regal With A 4.1 .
Can I Rebuilt The 4.1 And Put All Of The 1987 Gn Parts On That Block ?
If No Why Not?
If Yes, Will More Cubes Equal More Power?
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  #2  
Old 07-27-2005, 09:53 AM
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Default Re: 4.1 Vs 3.8

4.1 will have a 14 bolt oil pan vs. the 20 bolt pan.

Other than that, here's some links to help:

http://www.gnttype.org/techarea/pict...lockguide.html
http://www.gnttype.org/general/rebuild.html
http://www.gnttype.org/techarea/pict...s/oilpans.html
http://www.gnttype.org/techarea/recipes/41recipe.html
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1987 GN original owner 650+ HP Black
2015 BMW 328xi XDrive wagon
2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold)
2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold)
2014 Silverado LTZ Crew 4WD
2012 Honda VFR 1200F Tahitian Blue (sold)
2015 BMW S1000R Racing Red
2013 Honda CBR500R Red (wife's bike)
2014 Triumph Bonneville T100
2003 Harley Davidson V Rod Anniversary Edition
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Old 07-29-2005, 08:45 AM
turbopowered68 turbopowered68 is offline
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Default Re: 4.1 Vs 3.8

Thank You Very Much For The Advice I Will Rebuilt My 3.8 Motor As The Only Thing Wrong With It Is The High Miles And Very Little Smoke.
Now Are There Any Specific Rules I Should Follow. Like Oversize, Piston Type, Cam Size And Roller Lifters Or Not, Ect.
I Never Have Time To Go To The Track But I Am Pretty Shore I Race More Than Does That Do Go To The Track .
I Will Drive This Car Every Day. And I Donít Have A Million Dollar Budget. I Donít Want To Start With The Bolt Ons To The Have To Take Them Of And Then Rebuilt The Block And Heads .
I Want A Strong Solid Foundation Now So That When I Have The Money For The 1500.00 Turbo And The 1000.00 Intercooler I Wont Have To Do Anything Else. So If There Is A Rule Of Thumb Or List Of Them What Is It Or Where Can I Find Them. Thank You Very Much For Your Time And Very Valuable Advice. Dave.
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Old 07-29-2005, 09:51 AM
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Default Re: 4.1 Vs 3.8

Here's some typical build ups:

http://www.gnttype.org/techarea/recipes/recipepage.html

Basic rebuild guide:

http://www.gnttype.org/general/rebuild.html

My two cents:
  • Don't overbore unless you have to due to cylinder taper or wear
  • Forged pistons are a good investment ... JE, Wiesco, Diamond, BRC all are good choices
  • Pay special attention to clearances ... for a street motor you want to be in the middle of the factory specs, IMHO
  • Don't go "cam crazy" for a street car ... usually something in the 208 range is big enough
  • Stock style replacement timing chains work very well unless this is a higher winding combination
  • Turbos are usually around $750 (and pretty easy to resell) ... just be sure to match converter, turbo, injector combo
  • Use an engine machine shop that knows Buicks if possible
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Ken Mosher
1987 GN original owner 650+ HP Black
2015 BMW 328xi XDrive wagon
2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold)
2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold)
2014 Silverado LTZ Crew 4WD
2012 Honda VFR 1200F Tahitian Blue (sold)
2015 BMW S1000R Racing Red
2013 Honda CBR500R Red (wife's bike)
2014 Triumph Bonneville T100
2003 Harley Davidson V Rod Anniversary Edition
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