454 LS7 crate motor??? - Chevelle Tech
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post #1 of 15 (permalink) Old Sep 21st, 09, 12:11 AM Thread Starter
Chad
 
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454 LS7 crate motor???

Hey guys, I am looking at a Chevelle with a LS7 crate motor. The current owner said the motor was purchased in 1975 and never ran. He recently brought the motor to a race engine shop and had the compression lowered to 9.5-1. the motor was dynoed at 460hp 500tq with the new pistons and cam.(the org pistons/cam come w/purchase). I spoke with engine builder today and they comfirmed that motor had never been ran prior to them getting it and that it was a LS7. It has the "xch" stamped on block.

My question for you guys: How much is this engine worth? for example, I can get a 383 built with similar hp/tq for $7000 at local builder, so is this motor worth any more or less?

Thanks for any help you can give me.


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post #2 of 15 (permalink) Old Sep 21st, 09, 12:49 AM
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Re: 454 LS7 crate motor???

It's not worth anything special, they were over the counter crate engines. They didn't come in any car, so they are not collectible, and they were 12-1 compression factory, so they would have to be run on race gas. That means they would more than likely not be desirable for a street car. And at the 12-1 compression, it's a mild race engine at about 550-575 hp. Being that it was never fired, $4-$4500?

Ray

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post #3 of 15 (permalink) Old Sep 21st, 09, 2:12 PM Thread Starter
Chad
 
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Re: 454 LS7 crate motor???

Thx for your reply, that helps with my decision....i assume everyone else agrees as there is no other responses.
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post #4 of 15 (permalink) Old Sep 21st, 09, 2:39 PM
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Re: 454 LS7 crate motor???

I mean, the parts in it, are strong and reliable. With a roller cam change, those engine were making over 600 hp in many race cars. I remember in the mid 80's you could get them for like $2700.

Ray

http://s30.photobucket.com/albums/c3...t=DSC01615.jpg
Best pass so far 9.034 at 148.10, 1.242 60'
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post #5 of 15 (permalink) Old Sep 21st, 09, 2:51 PM
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Tim
 
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Re: 454 LS7 crate motor???

Chad,

Why would you want to get rid of a 454 Big-block??? I say keep it.

Tim Shea
72 Malibu w/ZZ4, Muncie M20 and 3.73 12-bolt.
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post #6 of 15 (permalink) Old Sep 21st, 09, 3:18 PM Thread Starter
Chad
 
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Re: 454 LS7 crate motor???

thnks Ray and Tim.... Tim i guess my org post is a bit confussing....i would for sure keep the 454, that is the best part of the car....i was just wondering if the LS7 was collectable or nostalgic enough to increase the worth of the car....see my recent post at "what is it worth"
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post #7 of 15 (permalink) Old Sep 21st, 09, 3:19 PM
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Will
 
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Re: 454 LS7 crate motor???

I couldnt say how much the motor is worth but, that engine bay is super clean! Do you have any more pictures of the rest of the car or a link perhaps.

EDIT: Nevermind, I found your other post in "What's it Worth"

What a beautiful car. Looks allot like my car did before the bodywork started.

My signature doesnt work anymore...

Last edited by wills65; Sep 21st, 09 at 3:23 PM. Reason: found the "whats it worth" post
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post #8 of 15 (permalink) Old Sep 21st, 09, 3:42 PM
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Tim
 
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Re: 454 LS7 crate motor???

Quote:
Originally Posted by cgrady View Post
thnks Ray and Tim.... Tim i guess my org post is a bit confussing....i would for sure keep the 454, that is the best part of the car....i was just wondering if the LS7 was collectable or nostalgic enough to increase the worth of the car....see my recent post at "what is it worth"
Gotcha. Had me worried there for a moment.

Tim Shea
72 Malibu w/ZZ4, Muncie M20 and 3.73 12-bolt.
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post #9 of 15 (permalink) Old Sep 21st, 09, 5:36 PM
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Chris
 
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Re: 454 LS7 crate motor???

I remember going to Berger Chevrolet in the early 70s and picking up 2 LS7s for about $2500 each. One went into a '71 Blazer and the other into a 1971 Corvette. Both for the same ER doctor who had more money than brains. Broken rearends and transmissions soon followed.


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post #10 of 15 (permalink) Old Sep 22nd, 09, 1:31 PM
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Re: 454 LS7 crate motor???

I have one all original in my Chevelle. One of the last one available purchased by my dad around 1990. It runs great, but is a real handful on the street. It sure sounds sweet though.

1970 SS 454 LS-7
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post #11 of 15 (permalink) Old Sep 23rd, 09, 5:42 AM
Kory
 
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Re: 454 LS7 crate motor???

Had a friend with one about 15 years ago. Put a Comp Cams .714 lift cam in it with a 1050 Dominator in a 1970 camaro. Car went 10.45 @126 Good running motors.
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post #12 of 15 (permalink) Old Oct 2nd, 09, 2:29 AM
 
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Re: 454 LS7 crate motor???

Quote:
Originally Posted by cgrady View Post
thnks Ray and Tim.... Tim i guess my org post is a bit confussing....i would for sure keep the 454, that is the best part of the car....i was just wondering if the LS7 was collectable or nostalgic enough to increase the worth of the car....see my recent post at "what is it worth"

I think it would be worth more. Just like a hemi clone or L-88 clone. Or as Barret Jackson would say a re-creation. Also the ls-7 's internals were the best of the best parts from GM. Tuftrided crank, boron bolts, floating wrist pins,7/16 push rods and rod bolts , crossdrilled crank, ZL-1 camshaft. But since they changed the pistons and cam I couldn't call the motor a Ls-7 anymore. I would call it a LS-5, low compress and weaker cam. 460 hp gross is 360 net just like a 1971 LS-5. And who wants a LS-5? Keep it real and go LS-7.
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post #13 of 15 (permalink) Old Oct 2nd, 09, 2:54 PM
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George
 
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Re: 454 LS7 crate motor???

without the original pistons, "the engine formerly known as an LS7" might better apply.
Yes, all premium parts in the LS7. I had a chance to snag some STD bore LS7 slugs a few months ago...just no car suitable for this.

Great engine bay

George Kettler
o 70 Elky 496 build with #074 AL heads is done race weight should be 3895# with the AL heads and the thinner front race rubber. New combo, no times
o 68 Vette 427/M-20/3.36 23 year owner
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post #14 of 15 (permalink) Old Oct 2nd, 09, 3:18 PM
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Re: 454 LS7 crate motor???

keep it !!! just wished I could have bought the one on the floor at ausleys back in the 80's....
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post #15 of 15 (permalink) Old Oct 2nd, 09, 9:34 PM
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Derrick
 
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Re: 454 LS7 crate motor???

put the stock pistons and cam back in it and run it on E85..

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
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