422ci LS3 engine 642hp/578tq
For SaleEngine - Complete
Feb 6, 2025, 04:08 PM | Replies: 7 | Views: 1732
-
Price
$8,500• OBO
- Location Benson, MN, 56215, USA
- Condition New
Description:
422ci LS3
6.2 Aluminum block, 4.100" bore, 4.000" stroke.
642HP and 578TQ
10.25:1 compression ratio
58x reluctor crank.
The engine was dyno tested with a sheetmetal short runner intake manifold. Dyno time only on the engine, broken in and ready to go.
K1 forged 4.000" crankshaft
Molnar 6.200" H-beam connecting rods
Diamond 4.100" 2618 forged pistons
Clevite Coated bearings
ARP main studs - align honed mains
ARP head bolts
C5-R timing chain
BTR 239/254 .631/.610 114LSA cam
BTR .660" dual valve springs
Delphi LS7 lifters
BTR V2 Trunnion LS3 Rockers
Melling 10296 HV oil pump
C5 Corvette oil pan
ATI Corvette Damper pulley
LS3 0821 heads with new valve seats, valve job and bowl blend porting.
Last edited by Jakson; Apr 22, 2025 at 08:00 AM.
Reply
Factory sleeves. This block in particular was not core shifted nearly as bad as some I have seen. We built a bunch of 4.100 bore 6.2 based engines back when I was at TPIS. The majority of them being in race cars. That's actually where these pistons came from, they were a spare set we had on the shelf. One customer in particular, Ken Kurtz ran multiple winning seasons in his road racing Trans Am making 100hp more than this one does without issue.
Here's a link to that build:
https://www.motortrend.com/how-to/14...t-nasa-rocket/
Here's a link to that build:
https://www.motortrend.com/how-to/14...t-nasa-rocket/
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Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Someone is going to be happy with this. I had a 422 before I built a 427 out to 447, and they are ALL torque monsters. And with this camshaft it will rev real good and build great horsepower. Somebody better have some fat tires... LOL! If I were in the market, I'd jump on this! Nice price!
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