Just curious. I just want to know what the potential is for the LT1 intake.

 

I'd think on a 427 you'd do everything you can to open it up. I'd rather run a converted single plane carb intake if i was making the power that kind of investment should. Not that there aren't some fast stock intake LT1 cars, there is just more than likely more power to be had from a big converted carb intake.

But really though, if you're looking for good answers on how much power an LT1 intake can make in what combos, try looking at LT1 sites. 99% of the answers you'll see here will be guesses by people with no idea what they're talking about. I won't even venture a guess myself because i know damn well don't have a real feel of what driveable LT1s can run.

 

That's cool. I have someone who wants to buy my engine; computer, intake, and all. It's not even tuned yet. *IF* it were to happen, I'd like an EFI 427 with plenty of HP. I built this engine for TQ and street manners while still getting some good numbers, I'd like to build something a little more radical next time around.

I was thinking Motown 427 shortblock, AFR 227 heads, maybe ported LT1 intake, and a custom cam that always me to shift at 7000-7500 rpm. Also, would the 730 ecm work on something like this or would DFI be in order?

 

since you are already spending a lot of money... There are a few companies that do custom made sheat metal lt1ish intakes. They have a bigger plenum, wider runners, and flow way better. Get one of those, and a 1300cfm monoblade throtle body, and you will be in business. sorry I don't have the name of any of these companies, but do a search. I have heard of someone making 640hp out of a 396lt1 with this intake, and some killer heads. He had 12:1, but with an extra 30 cubes, you might be in the 600hp range.

 

600-650 HP would be about what I'd shoot for. I don't know if it's going to happen, but if this guy buys my engine, it's a go. He wants to buy it next year. My Pro-Built tranny should hold the HP for awhile, I'll need a 12 bolt and a new driveshaft though.

 

On something that extreme, DFI would be a damn good idea, if not necessary. You'd have a better selection of high flow injectors since you could go low impedance, and you could go SFI. And while you're at it you could run it closed loop on a WB O2.

 

I know of a guy running a 427 SB with EFI. He uses a modified Dominator single plane manifold with a Kinsler 1600 cfm TB. With 13.5:1 compression he pulls about 725 hp @ 6800 rpm. I don't think a LT1 manifold will flow enough for that much HP.

 

The LT1 intake becomes a restriction after 7k. A single plane intake or a custom sheetmetal intake from hogans or the other custom places.

 

In order to get that kind of RPM you would have to change to an aftermarket ECM. As far as I know the 730 is limited to 6375 max rpm. cheers, Bob

 

The 730 will support 6350rpms+ , the ecm just uses the last 6300rpm table entry for fuel.

Brendan

 

FYI, at camaroz28.com there is a guy making a polymer plastic LT1 intake. It is in the proto type stage right now but only weights like 4lbs comparied to the stock intake. Just another option!

 

The LAST RPM level you can make a correction is 6,400 rpm. Beyond 6,400 rpm, the ECM just uses the last entry as stated by Brendan.