B'klyn9C1
01-27-2012, 10:37 PM
I have a 1995 Chevy Caprice 9C1 with a completely redone "sports" suspension and running on 275/40-18 size tires on 18"x9.5" Corvette C5 wheels. I'm thinking about to swap in a LSx stroker with a 4 inch crank and ported LS3/L92 heads and a 6L80E/6L90E transmission. I am interested in a high performance street build with near OEM reliability, longevity and driveability. My LT1 has nearly 200k miles on the clock right with a little oil consumption. My performance goal is to get 525+ RWHP/500+ RWTQ.
To get 500+ RWHP out of a LT1 I would need a real radical solid roller cammed 396 ci stroker. Not exactly very daily driver friendly. A 600+ FWHP LSx would still be a hydraulic roller cammed and still get half decent gas mileage.
Here are the reasons why I am considering a LSx swap:
The Optispark ignition is shall we say "problematic".
The stock LSx ignition is used even on heavily modified FI engines.
The EFI Connection LS1 ignition conversion cost $1000+
Unported LS3/L92 flow 300 CFMs(intake) out of the box.
For LT1/LT4 heads to flow like from a good porter(CNC) cost over $1000.
Conversion kits are getting better all the time(e.g. S&P, BRP Hot Rods)
LSx come stock with a fairly high flowing midlength runner composite intake.
LSx 6 liter iron cores(LQ4/LQ9, LY6) are now cheap and plentiful and are still lighter than a iron headed B-Body LT1.
My 17 year car old needs a new wiring harness anyway. OEM wires aren't top notch.
Good custom exhausts systems including headers for either LT1 or LSx are about the same.
Gen III and Gen IV PCMs are superior to Gen II PCMs.
Gen IV PCMs allow the use of GM six speed autos the 6L80e and the 6L90e with manumatic capabilities.
What things should be on my checklist for a LSx swap into a '94-'96 B-Body??
What LSx swap kit do you reccomend?? BRP Hot Rod or Street and Performance???? Or whoever??
B'klyn9C1
Brooklyn, NY
To get 500+ RWHP out of a LT1 I would need a real radical solid roller cammed 396 ci stroker. Not exactly very daily driver friendly. A 600+ FWHP LSx would still be a hydraulic roller cammed and still get half decent gas mileage.
Here are the reasons why I am considering a LSx swap:
The Optispark ignition is shall we say "problematic".
The stock LSx ignition is used even on heavily modified FI engines.
The EFI Connection LS1 ignition conversion cost $1000+
Unported LS3/L92 flow 300 CFMs(intake) out of the box.
For LT1/LT4 heads to flow like from a good porter(CNC) cost over $1000.
Conversion kits are getting better all the time(e.g. S&P, BRP Hot Rods)
LSx come stock with a fairly high flowing midlength runner composite intake.
LSx 6 liter iron cores(LQ4/LQ9, LY6) are now cheap and plentiful and are still lighter than a iron headed B-Body LT1.
My 17 year car old needs a new wiring harness anyway. OEM wires aren't top notch.
Good custom exhausts systems including headers for either LT1 or LSx are about the same.
Gen III and Gen IV PCMs are superior to Gen II PCMs.
Gen IV PCMs allow the use of GM six speed autos the 6L80e and the 6L90e with manumatic capabilities.
What things should be on my checklist for a LSx swap into a '94-'96 B-Body??
What LSx swap kit do you reccomend?? BRP Hot Rod or Street and Performance???? Or whoever??
B'klyn9C1
Brooklyn, NY