LS7 700whp
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 113
Likes: 45
From: Maryland
LS7 700whp I have a lofty goal and I'd like to see what other people have put together to get close to it. I'm putting my LS7 back together after a lifter failure and I'm shooting for 700whp NA. I have 13:1 compression now, and MSD intake and a 253/268 @ .050 cam grind. I'm probably going to have IronMask port the MSD intake to his Maximus 112sr and work the heads to match. I'm running E85 through FIC 1000cc injectors. I'm told so far I might see around 670whp with this. Have any of you built a 700whp NA 427, and if so are you willing to share what you did? I havent assembled anything, so I can still make changes.
I have a lofty goal and I'd like to see what other people have put together to get close to it. I'm putting my LS7 back together after a lifter failure and I'm shooting for 700whp NA. I have 13:1 compression now, and MSD intake and a 253/268 @ .050 cam grind. I'm probably going to have IronMask port the MSD intake to his Maximus 112sr and work the heads to match. I'm running E85 through FIC 1000cc injectors. I'm told so far I might see around 670whp with this. Have any of you built a 700whp NA 427, and if so are you willing to share what you did? I havent assembled anything, so I can still make changes.
Thread Starter
On The Tree
Joined: Oct 2015
Posts: 113
Likes: 45
From: Maryland
I dont unfortunately. Its going in my 15 Z28. Im just looking to get as close as I can and still run on pump E85 without taking my hood off.
im in the same boat with my rx7 and plan on running the iron mask 112 on my 454. Beck makes a custom sheet metal manifold that’s close to the same height as the msd but other than that your limited.
DarthV8r, who is a mod here, did 692 on pump 93 with an MMS MSD and MMS 265 heads a couple years ago. He’s running 12.5 compression. On E, he would be well over 700. You can get there, but the devil is in the details. I did the 440 shortblock for Darth and it was a very trick build. He does have a tick more cam than you also at a 256/270 if I remember right…
I know RPM had one of their C6Z06s hit like 670rwhp on pump 93 with their B3 cam so im thinking if you go with like the CF PTR Hi-ram manifold 103mm Katech TB custom Cam Motion LLSR Cam and either AHP Arch Angel LS7 heads or the Frankestein versions and all the little supporting mods its very attainable there have been a few who have already done this and there is a C6 Z06 out of Texas GapGod i think he goes by on the internet that is close to 800hp not sure if thats rwhp or just HP though good luck though and remember tuning is always the key
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The core of the recipes doing it are good enough heads, .750+ lift, get the headers and intake on point. More cubes is easier, but no matter what you need to rpm it to get there. I would look at a LS3 low ram intake and slap the LS7/LS3 adapters on it or epoxy it to match. The shorter runner will make it rpm which will get you the number. That being said, the MSD may be faster overall, especially in a Z, that thing isn't light. If you don't already have the short block done, go big👍.
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If you're on the factory ecu, it's gonna be tough to clip 700 being rpm and intake limited. You're gonna need compression (I'd be shooting for 14+) and cam lift (min .750") to get there and a wide open intake path.
Take a peak at my build thread, I'm sure you'll find similarities there to start with
Take a peak at my build thread, I'm sure you'll find similarities there to start with
TECH Fanatic
Joined: Dec 2017
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I never tuned it on the stock computer. All my hi ram setups have peaked around 72-7300. You need a pretty huge cam to peak higher with 427+ cubic inches or a short runner intake.
It only take money to make 700rwhp n/a 
Agreed with needing better heads (AllPro, MAST, Frankenstein, CID, etc). Then the last few ponies are all about perfecting the combo with better headers, slightly bigger cam, more compression etc.
Agreed with needing better heads (AllPro, MAST, Frankenstein, CID, etc). Then the last few ponies are all about perfecting the combo with better headers, slightly bigger cam, more compression etc. Tough was probably the wrong word, it's definitely doable. But I still don't like the factory ecu for a push beyond 700whp. You're getting into cam specs and intakes that want more rpm than it has to offer. Or you're just cutting off a part of your powerband.
The search tab is your friend lol....stock bottom end LS7 on the Factory E38 ECU here at 700+ NA....https://ls1tech.com/forums/dynamomet...-700-rwhp.html
As the others mentioned. The basic recipe falls down to very stable valvetrain. The heads need to be able to do what you want and then some (good flow and velocity in all lift measurements). The cam as @jayyyw stated is going to need to be more than the BTR 4 you were talking about using in your facebook post (at least from what I remember that is what you were looking to use, I may be wrong). Definitely give it as much lift and rpm a possible. Either a hi ram, Brentons MSD 112 setup will get there.