High Performance

Significantly higher performance over stock... not for aftermarket air filters and mufflers. Discuss blowers, super-chargers, turbo, nitrous, replacement performance engines...
MRRSM
Invoking the "F" Word in In-Line Sixes... "The Barra"
Replies
0
Views
121
MRRSM
MRRSM
A
4.2L Turbo Build
Replies
7
Views
660
hawkeye405
hawkeye405
B
Upgrades??
Replies
5
Views
253
Bronsonc1856
B
Mooseman
(Videos) 4.2L performance build with dyno
Replies
17
Views
389
Mooseman
Mooseman
E
4200 Manual Transmission Flywheels - group buy
Replies
3
Views
944
efi-diy
E
Mooseman
YT: 4200 turbo build
Replies
27
Views
2K
rchalmers3
R
Maverick6587
LS2 Rat Rod Build
Replies
11
Views
1K
Mooseman
Mooseman
E
4200 cams - Bullet cams
Replies
5
Views
1K
efi-diy
E
I_Shoot_Back
New video on a turbo 4200.
Replies
3
Views
678
Sparky
Sparky
Capote
  • Locked
Capote's 4.2L Turbo Build (ᴩʀᴏᴊᴇᴄᴛ ᴀʙᴀɴᴅᴏɴᴇᴅ)
Replies
19
Views
14K
Reprise
Reprise
Boricua SS
Cam swap complete!
Replies
9
Views
2K
Boricua SS
Boricua SS
MRRSM
After-Market HP Con-Rods for GM 4.2L LL8
Replies
0
Views
2K
MRRSM
MRRSM
mvtedesco7771
New project
Replies
3
Views
2K
dmanns67
dmanns67
E
billet cam blanks - with VVT oil passages
Replies
2
Views
1K
efi-diy
E
M
4.2 turbo in 1950's chevy pick up
Replies
4
Views
3K
Envoy_04
Envoy_04
00brado
turbo injector help
Replies
2
Views
2K
00brado
00brado
E
turbo pistons
Replies
0
Views
2K
efi-diy
E
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