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Forums
Performance, Builds & Detailing
High Performance
Significantly higher performance over stock... not for aftermarket air filters and mufflers. Discuss blowers, super-chargers, turbo, nitrous, replacement performance engines...
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E
4200 Manual Transmission Flywheels - group buy
efi-diy
Feb 18, 2019
Replies
5
Views
3K
Dec 14, 2023
efi-diy
E
MELLING GM - GMC LS ENGINE PERFORMANCE KIT CATALOG
mrrsm
Nov 13, 2023
Replies
0
Views
408
Nov 13, 2023
mrrsm
"IF... You Get My DRIFT... ?"
mrrsm
Aug 21, 2023
Replies
1
Views
637
Aug 21, 2023
Chickenhawk
YT: 4200 turbo build
Mooseman
Aug 8, 2020
2
Replies
45
Views
8K
Jan 14, 2023
TollKeeper
4.2L LL8 Atlas turbo exhaust manifold
808
Jan 14, 2023
Replies
0
Views
2K
Jan 14, 2023
808
C
Custom Billet cam cores for GM 4.2L (Vortec 4200)
CamKing
Sep 12, 2022
Replies
1
Views
2K
Sep 17, 2022
mrrsm
A
4.2L Turbo Build
Andyman2008
Mar 9, 2021
Replies
8
Views
2K
Sep 9, 2022
boosted blazer
B
"Connecting The Dots..." on using Carbon Fiber Con-Rods for HP Engines
mrrsm
Jun 7, 2022
Replies
2
Views
932
Jun 8, 2022
TollKeeper
"Sweet Suburban Classic" with a Twin Turbo Six
mrrsm
Jan 2, 2022
Replies
1
Views
1K
Jan 2, 2022
coolride
Invoking the "F" Word in In-Line Sixes... "The Barra"
mrrsm
Aug 24, 2021
Replies
0
Views
949
Aug 24, 2021
mrrsm
B
Upgrades??
Bronsonc1856
Jul 19, 2021
Replies
5
Views
2K
Jul 20, 2021
Bronsonc1856
B
(Videos) 4.2L performance build with dyno
Mooseman
Jun 3, 2021
Replies
17
Views
3K
Jun 19, 2021
Mooseman
LS2 Rat Rod Build
Maverick6587
Aug 12, 2019
Replies
11
Views
2K
May 14, 2020
Mooseman
E
4200 cams - Bullet cams
efi-diy
Feb 18, 2019
Replies
5
Views
2K
Apr 3, 2019
efi-diy
E
New video on a turbo 4200.
I_Shoot_Back
Mar 18, 2019
Replies
3
Views
1K
Mar 19, 2019
Sparky
Locked
Capote's 4.2L Turbo Build (ᴩʀᴏᴊᴇᴄᴛ ᴀʙᴀɴᴅᴏɴᴇᴅ)
Capote
Feb 4, 2018
Replies
19
Views
24K
Dec 17, 2018
Reprise
Cam swap complete!
Boricua SS
Apr 22, 2017
Replies
9
Views
3K
Apr 30, 2017
Boricua SS
After-Market HP Con-Rods for GM 4.2L LL8
mrrsm
Jan 5, 2017
Replies
0
Views
3K
Jan 5, 2017
mrrsm
New project
mvtedesco7771
Feb 20, 2015
Replies
3
Views
3K
Feb 21, 2015
dmanns67
E
billet cam blanks - with VVT oil passages
efi-diy
Mar 2, 2014
Replies
2
Views
2K
Mar 15, 2014
efi-diy
E
M
4.2 turbo in 1950's chevy pick up
million-miles
Nov 9, 2012
Replies
4
Views
3K
Aug 19, 2013
Envoy_04
turbo injector help
00brado
Jun 14, 2012
Replies
2
Views
3K
Jun 14, 2012
00brado
E
turbo pistons
efi-diy
Jan 13, 2012
Replies
0
Views
2K
Jan 13, 2012
efi-diy
E
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