LS3 verus LS7
 

Opinions please...
Looking at going to LS and was wondering what are some opinions between the two motors..Both are MAST, Black Label, only difference is LS3 versus LS7(besides dry sump)...I have always wanted a 427 motor, but is there any benefit to the LS7 versus the LS3 besides it just being a HP difference. Price is not the issue here, just wondering he benefit.

Yes it will be Driven on the road/city, Highway, and occasional Autocross when possible.


LS3 416 Black Label 630HP*

Type: LS3 6.8L
Displacement: 416 Cubic Inches
Compression Ratio: 11.2:1
Bore x Stroke: 4.070 x 4.000
Rev Limit: 7000 RPM
Crank: Callies Forged
Rods: Callies H-Beam
Pistons: Diamond 2618 Alloy
Cam: Mast Custom 3-Bolt Core Cam
Heads: Mast Black Label LS3 Heads
Intake: LS3 Car Intake
Valve Springs: Mast Dual
Part Number: 117-223

LS7 427 BLACK LABEL 675HP*

Type: LS7 7.0L
Displacement: 427 Cubic Inches
Compression Ratio: 11.4:1
Bore x Stroke: 4.125 x 4.000
Rev Limit: 7250 RPM
Crank: Callies Forged
Rods: Callies H-Beam
Pistons: Diamond 2618 Alloy Pistons
Cam: Mast 3-Bolt Core Cam
Heads: Mast LS7 305 Black Label Heads
Intake: FAST LS7 Intake
Valve Springs: Mast Premium Dual Springs
Part Number: 117-304

In another words, I don't want to kick myself for not going with the 427 when I should have..lol

I have a ls7 but,converted it to conventional oiling systems...less chance of oil leaks, no power advantage with the dry sump, easier oil changes etc. If price isn't a concern then get what you want...the ls7 plus it's more power lol

Thanks...I was leaning towards normal wet sump as you said less chances of leaks....

how about something completely different?
7.0L duramax diesel? cappable of ~700fwhp with stock air and fuel system, and more than double that with aftermark fuel/air systems.. ~5500rpm redline. and 35+mpg

weighs little more than a iron head BBC.. though they have an aluminum block coming out $$$$$$
http://www.socaldiesel.com/SoCal%20D...oker%20Kit.htm

the audi R18diesel as won the 24 lemans last 12? times?

I say LS7, 427. I'm going LS7, 427 myself with a wet sump. And $13k for diesel rotating assembly...that'll be a negative for me. May be a cool engine, but I'll pass. Lol!

but you will drop ~20k on an engine? sorry had too lol :poke:
http://www.mastmotorsports.com/view.php?id=155&c=4&s=6

FWIW
~20k will buy used dmax, rebuild (non 427 stroker kit), install and have 1000-1200hp with supporting fuel and air.
~7k can do a repower and be around 650-700

Go wet sump LS7 and get yourself that 427 you've always wanted. :thumbsup:

Marcus wished he "only" had 20k in his engine.
Comparing diesel torque numbers to LSX torque numbers is foolish. And those guys making those kind of HORSEPOWER numbers, Not TORQUE numbers, have pulled out a second mortgage on their farms. The supporting systems to make that happen is BIG MONEY, but I guess an 8 second diesel is cool...

RBuhr69, if money isn't a determining factor for you in this hand, I'd easily go with the LS7, no question. The Mast guys are the real deal. Damon has helped me out a ton, and they always go out of their way for you.

is it cheap..... NO.. none of this stuff is "cheap"..
1000hp diesel is darn near a you need A, B, C parts and a good tuner. engine, turbo, fuel parts can be had for ~20k labor not included

beating up on gas engines like audi does at the leman with a diesel is definitely cool and different..

i'd side with the LS7 over the LSx



got to pay to play right?

There is something special about a 427 for me. Katech converted my LS7 to wet sump, and added their Torquer 110 cam and CNC heads, dyno'd at 610hp, 570 ft lb. But people talk about the 'LS7 tax'...and it is real. Got to pay to play.

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