High Performance

Significantly higher performance over stock... not for aftermarket air filters and mufflers. Discuss blowers, super-chargers, turbo, nitrous, replacement performance engines...
Capote
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Capote's 4.2L Turbo Build (ᴩʀᴏᴊᴇᴄᴛ ᴀʙᴀɴᴅᴏɴᴇᴅ)
Replies
19
Views
23K
Reprise
Reprise
Mooseman
YT: 4200 turbo build
Replies
45
Views
7K
TollKeeper
TollKeeper
M
4.2 turbo in 1950's chevy pick up
Replies
4
Views
3K
Envoy_04
Envoy_04
mrrsm
After-Market HP Con-Rods for GM 4.2L LL8
Replies
0
Views
3K
mrrsm
mrrsm
00brado
turbo injector help
Replies
2
Views
3K
00brado
00brado
Mooseman
(Videos) 4.2L performance build with dyno
Replies
17
Views
3K
Mooseman
Mooseman
Boricua SS
Cam swap complete!
Replies
9
Views
3K
Boricua SS
Boricua SS
mvtedesco7771
New project
Replies
3
Views
3K
dmanns67
dmanns67
E
4200 Manual Transmission Flywheels - group buy
Replies
5
Views
2K
efi-diy
E
E
turbo pistons
Replies
0
Views
2K
efi-diy
E
808
4.2L LL8 Atlas turbo exhaust manifold
Replies
0
Views
2K
808
808
A
4.2L Turbo Build
Replies
8
Views
2K
boosted blazer
B
Maverick6587
LS2 Rat Rod Build
Replies
11
Views
2K
Mooseman
Mooseman
E
4200 cams - Bullet cams
Replies
5
Views
2K
efi-diy
E
E
billet cam blanks - with VVT oil passages
Replies
2
Views
2K
efi-diy
E
B
Upgrades??
Replies
5
Views
1K
Bronsonc1856
B
I_Shoot_Back
New video on a turbo 4200.
Replies
3
Views
1K
Sparky
Sparky
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
954
coolride
coolride
mrrsm
Invoking the "F" Word in In-Line Sixes... "The Barra"
Replies
0
Views
858
mrrsm
mrrsm
mrrsm
"Connecting The Dots..." on using Carbon Fiber Con-Rods for HP Engines
Replies
2
Views
829
TollKeeper
TollKeeper
mrrsm
"IF... You Get My DRIFT... ?"
Replies
1
Views
428
Chickenhawk
Chickenhawk
mrrsm
MELLING GM - GMC LS ENGINE PERFORMANCE KIT CATALOG
Replies
0
Views
235
mrrsm
mrrsm
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