High Performance

Significantly higher performance over stock... not for aftermarket air filters and mufflers. Discuss blowers, super-chargers, turbo, nitrous, replacement performance engines...
Mooseman
YT: 4200 turbo build
Replies
45
Views
7K
TollKeeper
TollKeeper
Capote
  • Locked
Capote's 4.2L Turbo Build (ᴩʀᴏᴊᴇᴄᴛ ᴀʙᴀɴᴅᴏɴᴇᴅ)
Replies
19
Views
23K
Reprise
Reprise
Mooseman
(Videos) 4.2L performance build with dyno
Replies
17
Views
3K
Mooseman
Mooseman
Maverick6587
LS2 Rat Rod Build
Replies
11
Views
2K
Mooseman
Mooseman
Boricua SS
Cam swap complete!
Replies
9
Views
3K
Boricua SS
Boricua SS
A
4.2L Turbo Build
Replies
8
Views
2K
boosted blazer
B
B
Upgrades??
Replies
5
Views
1K
Bronsonc1856
B
E
4200 Manual Transmission Flywheels - group buy
Replies
5
Views
2K
efi-diy
E
E
4200 cams - Bullet cams
Replies
5
Views
2K
efi-diy
E
M
4.2 turbo in 1950's chevy pick up
Replies
4
Views
3K
Envoy_04
Envoy_04
I_Shoot_Back
New video on a turbo 4200.
Replies
3
Views
1K
Sparky
Sparky
mvtedesco7771
New project
Replies
3
Views
3K
dmanns67
dmanns67
E
billet cam blanks - with VVT oil passages
Replies
2
Views
2K
efi-diy
E
mrrsm
"Connecting The Dots..." on using Carbon Fiber Con-Rods for HP Engines
Replies
2
Views
827
TollKeeper
TollKeeper
00brado
turbo injector help
Replies
2
Views
3K
00brado
00brado
C
Custom Billet cam cores for GM 4.2L (Vortec 4200)
Replies
1
Views
1K
mrrsm
mrrsm
mrrsm
"Sweet Suburban Classic" with a Twin Turbo Six
Replies
1
Views
953
coolride
coolride
mrrsm
"IF... You Get My DRIFT... ?"
Replies
1
Views
428
Chickenhawk
Chickenhawk
808
4.2L LL8 Atlas turbo exhaust manifold
Replies
0
Views
2K
808
808
mrrsm
Invoking the "F" Word in In-Line Sixes... "The Barra"
Replies
0
Views
858
mrrsm
mrrsm
mrrsm
MELLING GM - GMC LS ENGINE PERFORMANCE KIT CATALOG
Replies
0
Views
235
mrrsm
mrrsm
mrrsm
After-Market HP Con-Rods for GM 4.2L LL8
Replies
0
Views
3K
mrrsm
mrrsm
E
turbo pistons
Replies
0
Views
2K
efi-diy
E
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