C6 Curtis

Completely agree, so much misinformation here. This guy is going for a max effort N/A build NOBODY should be showing him a plastic manifold ported or not.

Only thing he should be looking at is a Holley Hi ram or single plane/ big time manifolds.

-Curtis

double06

There was a guy who I think had a Monte Carlo out of Washington state that showed the LS7 motor he had in his car and he was trying to reach 700 hp NA. Now he had an automatic so a little tougher, but you will see all the stuff he had to do to get to 700 hp and I think he fell 8 hp short or may have finally made it. This will give you and idea if you are sticking to a 427 size motor. Someone may remember and can post a link.

double06

The extra 27 inches will help. But still look at Monte Carlo post.

SHovV

The guys username is JohnB with the LS7 monte carlo

Vato's C6Z06

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FSTFRC

He has a build thread on LS1tech.com

Vato's C6Z06

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Premiumspeed

Good luck with your build, can't wait to see the results.

Would love to see the cam specs you match with those heads.

MyLS1Hauls

He has a sheet metal intake with a solid roller cam...Big difference. With that manifold, he traded some midrange torque, to gain high RPM hp. The long runner plastic intakes have trouble breathing up top with 427ci...454 is going to make it even worse. I bet your torque numbers will be great, but 700rwhp is a tall order when N/A, through a FAST or MSD intake.

Also, there is a difference between cubic inches gained by increasing the bore, and cubic inches gained by increasing the stroke...to get 454ci, you're doing both. In my experience, increasing the stroke doesn't yield as much HP per CI, as increasing the bore...and that is due to a few reasons. Look forward to seeing your results...motor should be a beast.

GARY2004Z06

Why limit yourself to a plastic intake on a great build? It is all about matching components.
Here is an N/A build designed by robz that has made 926 HP on Jesel's engine dyno on a start up tune. This is with an aluminum intake. Talk to you shop about various options. Good luck.

Vato's C6Z06

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richie427

So you like that sound? It 's like a hummingbird, (drinkin) sour patch. at the movies.

EX1

Your rotating assembly in that shortblock is likely heavier than stock stuff so it will be harder for you to make the same power at the same compression ratio. The stock LS7 has Ti rods and fairly light pistons. The aftermarket steel components you will be likely to run are harder to turn. The extra cubic inches will help though.

What is your rotating assembly composed of? Are you doing a solid roller?

Undy

If you're going with a solid roller then you need to be aware that solid roller lifters have a typically short life expectancy. When they fail they spew needle bearings and metal fragments throughout your engine and generally requires a subsequent entire engine tear-down to clean and inspect for additional damage. I would NEVER run them on a street driven engine, FWIW.

Vato's C6Z06

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Vato's C6Z06

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C6 Curtis

That's pretty bad, I know a couple ppl with solid rollers and what you mentioned has not happened. If he is going for every bit of power a solid roller is what he should use. You are misinforming people on here.

-Curtis

Undy

So you have a couple friends that are running solid rollers and they haven't crapped the bed yet? Then, you base your comment solely on those couple people?? You sir are the misinformed one. If you spend a couple minutes doing some research you might not be as likely to fire one from the hip again...

MyLS1Hauls

Not all solid rollers are equal. A more mild, low lash solid roller will have greatly improved longevity, over older, more traditional solids. Just like with a hydraulic roller, it is all in how aggressive the lobes (and corresponding springs) are. If the lobes are almost square, its going to wear out parts very quickly. If the lash ramp isn't designed properly, that can be hard on parts as well.

C6 Curtis

Get out of the 1980's he is going for 700whp max effort build and you're scaring people away from a solid roller. Not to mention you're being a toxic to people on here trying to learn. You need to do more research, I'm aware of the maintenance on a solid cam. The 700whp LS7 monte has a solid roller and he's been running one for a while if you didn't know. I'm not firing anything from the hip Mr. Old west.



+1 exactly

-Curtis