LSX 427 or LSX 454 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

1 BADD 1LE · 04-25-2014, 09:36 AM

Members,
I have sold my 2.9L Whipple Supercharger and am in the process of selling my LS3 Long Block to someone (pic attached). The team at Lethal Racing is preparing to start the second phase of my build after Camaro Fest next week. We will be going with a set-up that produces 1000rwhp (engine, supercharger, fuel system, Meth Injection) at 70-75% of the engine/blower capacity. I am hoping for around 1100-1200 RWHP, so we can tune it down to a conservative 1000rwhp for street use. I know that sounds insane, but my goal has always been to have a 1000rwhp street car! My question to the forum members is which engine would you go with, LSX 427 or LSX 454, and why. Once the build is complete, with the supporting drivetrain components upgraded, we will be tracking the car some, but it will remain my street car/show car toy...thanks and look forward to hearing from you guys!!!

62nalide · 04-25-2014, 09:41 AM

IMHO I'd say 427

gajagfan · 04-25-2014, 09:43 AM

From the old carbureted days, its hard to beat cubic inches. Go big or go home! That my not apply to today's engines if there are better performance parts for the 427 than the 454. I am not sure what the differences are between the two to start with, so my comments may be of no value.

copper98 · 04-25-2014, 09:44 AM

Nothing beats cubic inches - 454

Sent from my Nexus 5 using Tapatalk

62nalide · 04-25-2014, 10:20 AM

Quote:

Originally Posted by copper98

Nothing beats cubic inches - 454

Sent from my Nexus 5 using Tapatalk

Depends on what it's used for, Force Induction isn't the best thing to run on a 454 LSX.

SemperGumby · 04-25-2014, 10:22 AM

454 > 427. Makes sense to me.

Unreal · 04-25-2014, 10:26 AM

Only difference is the size of the piston, and thickness of the walls. 454 will actually be weaker. On a n/a build that isn't stressing the block the extra cubes can be nice, but for a 1000+rwhp build you are just making it weaker and the power adder will determine the power, not the size of the motor.

62nalide · 04-25-2014, 10:27 AM

Quote:

Originally Posted by SemperGumby

454 > 427. Makes sense to me.

Under boost not so much

BplumCrazy-SS · 04-25-2014, 10:29 AM

depends on what kind of boost you will be running but my vote would be 427 for reliability since its more of a street/show car........ its not hard to hit 1000+ on a 427

Jeff_SS · 04-25-2014, 10:54 AM

Lol one day you're selling it, one day you're upgrading it, one day you're getting new wheels, the next day you're getting different wheels..
Now you're selling your engine and putting in a new one for a 1krwhp "street car"..
Going to be interesting to see if you're even remotely satisfied when you're done this time around...

Go with a 427.

Nightmare2012 · 04-25-2014, 01:57 PM

LSX427 IMO

Rdphish73 · 04-25-2014, 03:09 PM

"Conservative 1000hp for street use" he says....

AG454 · 04-25-2014, 05:45 PM

I vote for the 454. It's a monster engine NA, I can't imagine it FI. GM says the block can handle 2000HP, but maybe the cylinder walls are too thin for high boost.

VADER SS L99 · 04-25-2014, 09:25 PM

Quote:

Originally Posted by AG454

I vote for the 454. It's a monster engine NA, I can't imagine it FI. GM says the block can handle 2000HP, but maybe the cylinder walls are too thin for high boost.

Not only are the walls too thin for boost but a 454 will have a greater chance of detonation because of the shear piston size. A 4.00" stroke engine will be in theory more reliable than a 4.10+" stroke engine as well. There are 3 reasons he should do a 427 over a 454 and all of them deal with reliability with that much power and boost.

OP, you should look into a re sleeved ERL block as well if your budget will allow it. That way you can still have a 6 bolt block but it will be aluminum. Between the blower and LSX block its probably another 200+lbs on the nose of your car. http://www.erlperformance.com/gm-ls-...-block-sleeved

04-25-2014, 09:36 AM	#1
1 BADD 1LE Black Widow Drives: 2014 Camaro 427SS Join Date: Nov 2013 Location: Lafayette, LA Posts: 178	LSX 427 or LSX 454 Members, I have sold my 2.9L Whipple Supercharger and am in the process of selling my LS3 Long Block to someone (pic attached). The team at Lethal Racing is preparing to start the second phase of my build after Camaro Fest next week. We will be going with a set-up that produces 1000rwhp (engine, supercharger, fuel system, Meth Injection) at 70-75% of the engine/blower capacity. I am hoping for around 1100-1200 RWHP, so we can tune it down to a conservative 1000rwhp for street use. I know that sounds insane, but my goal has always been to have a 1000rwhp street car! My question to the forum members is which engine would you go with, LSX 427 or LSX 454, and why. Once the build is complete, with the supporting drivetrain components upgraded, we will be tracking the car some, but it will remain my street car/show car toy...thanks and look forward to hearing from you guys!!! Attached Images __________________ 100% Lethal Racing Built/Tuned/Maintained Black Widow Camaro 427SS

04-25-2014, 09:41 AM	#2
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	IMHO I'd say 427 __________________ https://frankensteined.net/ Martin@Frankensteined.net

04-25-2014, 09:44 AM	#4
copper98 Camaro 5 Muscle Drives: 2012 CAMARO 2SS/RS Join Date: Feb 2012 Location: Miami Posts: 1,152 View My Garage	Nothing beats cubic inches - 454 Sent from my Nexus 5 using Tapatalk __________________ Mods: Air Raid C.A.I., Custom Ported/Polished Throttle Body, Kooks 1 7/8 Headers, Dyno Tuned , LPE 3.91 Gears, BMR Differential Bushings, R/X Oil Catch Can, X-Pipe, Borla Exhaust, MGW Shifter, Hawk-HPS, SS brake lines, BMR front & rear sway bars, BMR rear sway bar end links, Pedders front radius rod bushings, Spohn front sway bar end links, BMR rack/pinion bushing, BMR Coils 1" drop, BMR Trailing Arm, BMR Toe Rods, Pedders Sub-Frame bushings, BMR Sub-frame Connectors, BMR Driveshaft Tunnel Braces, GM Strut tower brace, custom painted bowties

04-25-2014, 10:26 AM	#7
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Only difference is the size of the piston, and thickness of the walls. 454 will actually be weaker. On a n/a build that isn't stressing the block the extra cubes can be nice, but for a 1000+rwhp build you are just making it weaker and the power adder will determine the power, not the size of the motor. __________________ Nick Corvette Z06 -1200ish rwhp

04-25-2014, 10:29 AM	#9
BplumCrazy-SS Drives: 416 w/TH400 Join Date: Mar 2012 Location: Houston Posts: 697	depends on what kind of boost you will be running but my vote would be 427 for reliability since its more of a street/show car........ its not hard to hit 1000+ on a 427 __________________ ERL 416 - 12.5 cr, TH400, Custom VVT Cam, PRC 255 heads, NW 102 TB, Aeromotive stealth fuel system, Fast 102 plumbed with a nitrous express direct port kit, BMR 15" conversion kit

04-25-2014, 09:43 AM	#3
gajagfan Drives: 2013 1SS 1LE Black - Std Exhaust Join Date: Mar 2013 Location: Brunswick, GA Posts: 3,622 View My Garage	From the old carbureted days, its hard to beat cubic inches. Go big or go home! That my not apply to today's engines if there are better performance parts for the 427 than the 454. I am not sure what the differences are between the two to start with, so my comments may be of no value.

04-25-2014, 10:22 AM	#6
SemperGumby I'll probably offend you Drives: 2013 2SS/RS M6 Join Date: Apr 2013 Location: WV Posts: 257 View My Garage	454 > 427. Makes sense to me.

04-25-2014, 10:54 AM	#10
Jeff_SS "Cam Only" Drives: 2013 Camaro SS Join Date: Nov 2011 Location: Scottsdale, AZ Posts: 1,709 View My Garage	Lol one day you're selling it, one day you're upgrading it, one day you're getting new wheels, the next day you're getting different wheels.. Now you're selling your engine and putting in a new one for a 1krwhp "street car".. Going to be interesting to see if you're even remotely satisfied when you're done this time around... Go with a 427. __________________ 2013 AGM Camaro 2SS/RS M6 \| LSA Blower, 2.5" pulley, 10% lower, FIC1000's, Fore Innovations Twin Pump fuel system w/ Flex Fuel, CMS Custom Grind Cam, Kooks 1 7/8" headers w/ catless off-road pipes, NPP Exhaust, 3.91's, JLT ZL1 Intake, Prospeed Heat Exchanger \| Pfadt Suspension, 1LE Sway Bars \| DSS 1000hp axles \| Tuned by Ryne @ CMS E85: 734rwhp/636rwtq (mustang dyno)

04-25-2014, 01:57 PM	#11
Nightmare2012 come find out;) Drives: stockish 2012 camaro ss Join Date: Oct 2012 Location: speed county Posts: 2,166 View My Garage	LSX427 IMO

04-25-2014, 03:09 PM	#12
Rdphish73 Drives: 2012 Ashen Grey LS-3 RS/2SS Coupe Join Date: Jan 2013 Location: Saratoga Springs, NY Posts: 118	"Conservative 1000hp for street use" he says.... __________________ 2012 AGM LS-3 RS/SS: Airaid CAI, Ceramic Coated Dynatech SuperMaxx LT Headers, High Flow Cats, Borla "S-Type" Cat-Back Exhaust, Ted Jannetty Tuned, LS-3 Cowl Badging, RS/SS Fender Badging. Custom Bow-Ties by Lupe

04-25-2014, 05:45 PM	#13
AG454 I am not "Fast & Furious" Drives: 2010 Camaro LSX454 1LE Join Date: Nov 2008 Location: Greeley Colorado Posts: 1,040 View My Garage	I vote for the 454. It's a monster engine NA, I can't imagine it FI. GM says the block can handle 2000HP, but maybe the cylinder walls are too thin for high boost. __________________ The day I take a bend too fast Judgement that could be my last I'll be wiped right off the slate Don't wait up 'cause I'll be late, I'll be late