SLOW SEDAN

iTrader: (13)

No need to modify it or assemble it himself. He said he wanted a street build that replicated the performance of a typical supercharged LS3, as discussed in an earlier post its capable of doing that out of the box. Plus he said if he wants even more he can add nitrous on top, not sure why you would on the street but that's up to each person.

I don't see how slapping in the crate engine and driving off doesn't meet his goals? Pretty sure you can get the whole package for just under $9k with coupons and/or other deals online, GM even had a rebate at one point on top of all other deals. Your going to have more time and money invested buying into buying all the pieces separate and hoping it gets assembled half as good as GM can. The bare block and heads alone are over $6500, so $2500 more for a long block seems like a no brainer.

rkupon1

iTrader: (3)

This, post #14, is why I was/am confused.

TTur1996

[QUOTE=F me;20333038]Please read the description. According to this maybe some decking...
https://www.gmperformancemotor.com/parts/19417353.html

The LSX block needs more than just decking. My friend had to have his Line bored, lifter bores finished, clearanced if you want a CCW crank, piston bores finished, decked, and a pretty extensive deflash-deburr. I also don't know where you got $3800.00 from. Our builder only charged us $2650.00 for our Dart Ls Next block. All it needed was finish honed to pistons.

Dart has short blocks ready to go. I heard they may be doing long blocks, with their heads and intakes too.

The few people I have talked to about the GM Lsx454 already assembled motors said they are fine if you leave them as is. They are pretty much maxed out on their components. No one will leave their motor alone. Neither will you. That is why I'm suggesting to get what you will end up buying anyway, the first time. You do what you want. Its just a suggestion, nothing more.

SLOW SEDAN

iTrader: (13)

$3800 reference was from the same link you quoted for the LSX block which I agree is an absurd price and they do need a fair amount of work. However the components in the long block are no where near maxed out, I've seen untouched LSX454's make 1000hp. They come with forged crank, rods and pistons which aren't that fragile even GM rates them higher as they use the same crank, rods and pistons in the LSX 454R that's rated at 750+hp and people spray on top of. But I agree, let the guy do whatever he wants, enough with our suggestions.

LSX454 Tech 627/586

• Block (P/N 19260099): LSX cast iron with six-bolt cylinder head attachment
• Crankshaft (P/N 19244018): 4340 forged steel
• Connecting Rods (P/N 19166964): 4340 forged steel
• Pistons: (P/N 19166958): 4032 forged aluminum

LSX454 Tech Specs 776/649

• Block (P/N 19260099): LSX cast-iron with six-bolt, cross-bolted main caps
• Crankshaft (P/N 19244018): 4340 forged steel with eight-bolt flange
• Connecting Rods (P/N 19166964): 4340 forged steel
• Pistons (P/N 19166958): Forged aluminum

440_Stroker

I'm late to the party here but this is make take on it since I've have had multiple cars that make 700+ fwhp in different ways.

My stock long block C6 with a supercharger and exhaust made 600/611 rwhp/rwtq and drove like stock unless you got on it. Simple stuff that I bolted on in my friends garage. I daily drove the car for 2 years every day. Making that kind of power can be done in a few ways. A higher stress and revving 416/427 or a less stressed and lower revved 454.

As we all know larger engines eat bigger cams and make them seem more docile.

​​​​​​​If it's a cruiser I see no issue with a bigger engine being under-stressed and easier to drive and access the power lower in the power band. For a heavier car I think it helps it feel and be quicker down low and in normal driving. The member with a 450ci LS has an interesting engine. I'm very curious to see how it ends up!