gve

Has anyone or do you know anyone who bought the GM LSX 454 with the LS7 intake. I was thinking of buying this engine and installing it in my C3 and was wondering how the engine performed and are they satisfied with the engine? Thanks, Gary

Mark Riles

I think you may be placing the 454 in the wrong engine family. The last true 454 was the 7400 from the Vortec line. An LS7 is from the LSX family but parts do not interchange between the two.

63mako

No, he knows what he wants.
http://www.jegs.com/i/GM%20Performan...0002/-1?CT=999
These are rated at 620 hp carburated. I think that is an easier install.
http://www.jegs.com/i/GM-Performance...44033/10002/-1

uxojerry

I looked everywhere for the same crate motor your looking for and finally gave up. MAST motorsports has some LSX based 454s but most are using LS3 heads instead of the new LSX heads. If you have one built, it will be just under $20k by the time you get all of the components. I couldnt bring myself to trust any small time builder with $20k so I changed to a different motor. If you go this route keep the forum posted as this combination can easily generate 700hp on pump gas. GM also has an LSX tall deck block, allowing for at least 502 cubic inches. In for a penny in for a pound, lol.

gve

The 2011 Gm performance catalog has the engine, and with the LS7 intake it puts out 580 HP and 600# TQ. The catalog list it as a tall block but GM said thats a typo and its standard height.
This would fit under my 70 BB hood, I know its a lot of work but the problems with installation seem to be pretty well figured out.

63mako

Will this fit too?
http://store.gmperformanceparts.com/store/SelectProd.do?prodId=8207&redir=true&man ufacturer=GM&category=Supercharger%20Kit &name=LS9%20Supercharger%20Kit&model= <!--%2019244103%20-->

Mark Riles

My mistake. She's a beastly little thing though.

bluedawg

Scroggin dickey was the cheapest place I've seen them.

Garys 68

Check over at LS1tech, there have been a few installed.
Btw, I think the LSX454R is the tall deck while regular LSx454 is standard deck.

FRSTR90

Personally, I would not go with the LS7 Intake... they use the 90mm throttle body. Most of the people that I have seen with modified LS3's and LS7's are using the FAST LSXR 102mm Manifold.

http://www.fuelairspark.com/0/FS/Intake/Default.aspx

My dad is considering the LSX 454 620hp for his '73. If he goes this route, that manifold will be the one that he will use.

BTW - All LSX 454s from GM are standard deck. The LSX 454R is a standard deck. I believe that the short block is the same minus the cam. Heads are obviously different. LSX454R has fully CNC'd heads with 50cc combustion chambers providing a compression of 13.1:1 and a full mechanical roller. I've only been able to find one video of the LSX454R floating around and I can say that engine is serious race engine. I would consider putting a zz572/720R in C3 and driving it on the street... Not so much, with the LSX454R and its smaller cubes..

gve

Thanks for the info sounds like thats a better intake. I'm trying to get all the info I can to start the swap this fall. I have a 70 with a BB 454 and a 5 speed in the car now but I would like to install the LSX454.

holley505

A YES... IT WILL FIT...


Mine is a 418ci motor based on the LS3- I paid under 5k for a short block. Put AFR mongoose heads Victor JR intake and HOLLEY 780 DP carb. I can run high 10s a pump gas with a 3.36 gear and 3500 stall. I would think a 454LSX would get me to High 9s or low 10s.... added more gear and more stall... only faster!! These motors are awesome!

FRSTR90

This will be an awesome build! Out of curiosity, what gave you the LSX bug? I think I would have a hard time giving up the sound and feel of a well built solid roller BBC.. Don't get me wrong, I love the LS series engines, but you might find that you'll miss the nostalgic feel.

tekvette

I made over 700hp with my LS7/L92 441 with a 90mm tb. A good port matched LS7 intake will compete with a FAST just fine.

gve

I was always interested in the LS swaps that have been done so far by the members. Right now I have a solid lifter cam with aluminum heads but to get more horse I would need a L88 hood with a high rise intake. When GM came out with the LSX 454 and the fact that I could install it without having to change my BB hood was a plus. Also if anybody asks I can still say I have a 454 under the hood.

tfi racing

Not a GMPP crate motor,and not in a C3,but gives a good idea what these bad boys can put out...Anyone have a ball park guess on the weight savings over an old school BBC?

http://forums.corvetteforum.com/cana...7-rwhp-na.html

htown81vette

You chose the right manifold for that motor, the LS7 intake is hard to beat! I remember seeing flow numbers for that manifold, and it was quite impressive.

htown81vette

My guess would be between 100-150 lbs

MotorHead

It's pretty funny but the LS shop where I got mine dynoed is now building LSX454 N/A no power adders. They have been doing nothing but S/C and nitrous but I have seen the results in my buddies shop.

I like to think I had something to do with it when I ran my old Gen1 427ci there. They were asking how much nitrous I was using

Anyway they have just finished an LSX 454 that made 647RWHP N/A

There does come a point at which the car is no fun to drive on the street and I had a HP number that I didn't want exceed so I
could tool around town and blow the doors off pretty much everything when I want to

These guys don't fool around, they have an 8 second street driven Vette with all the accessories including air conditioning

http://forums.corvetteforum.com/cana...7-rwhp-na.html

tekvette

^^^^^^^All Pro heads and intake, that's like $10k right there.