Ls7 454 - Chevelle Tech
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post #1 of 32 (permalink) Old Oct 23rd, 09, 5:22 PM Thread Starter
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Jeff
 
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Ls7 454

does anybody know the cam specs for a LS7 454 or know where i can find them?
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post #2 of 32 (permalink) Old Oct 23rd, 09, 5:28 PM
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post #3 of 32 (permalink) Old Oct 23rd, 09, 5:32 PM Thread Starter
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Re: Ls7 454

thanks for the information i needed
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post #4 of 32 (permalink) Old Oct 23rd, 09, 6:00 PM
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Re: Ls7 454

You're welcome. And welcome to Team Chevelle Jeff.
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post #5 of 32 (permalink) Old Oct 23rd, 09, 7:20 PM
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Re: Ls7 454

For some reason I was thinking they came with the same cam as the LS6's. Guess I was wrong.

1966 Charger (383, 727 Torqueflight)
1970 SS 454 Chevelle (LS5+2, M22, 3.31 12 bolt)
1971 Malibu (350, M22, 3.31 12 Bolt)

I'm looking for a girl with a car, and a house..........with cable.

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post #6 of 32 (permalink) Old Oct 23rd, 09, 9:11 PM
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Re: Ls7 454

3959180 - Mechanical Flat Tappet

This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees.
Technical Notes: Distributor P/N 1104067 or melonized distribuor gear P/N 1045613 must be used on all crate engines with steel camshafts.


Hmmmm, remembering the specs as somewhat different that this .580/.600 lift.....
I helped a pal put the crate engine PN 774 in his 70 SS Chevelle. OMG, what a BEAST!

George Kettler
o SOLD 8/2016 my beloved 1970 Elky 496.
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #7 of 32 (permalink) Old Oct 26th, 09, 1:25 PM
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Re: Ls7 454


1970 SS 454 LS-7
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post #8 of 32 (permalink) Old Oct 26th, 09, 3:03 PM
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Re: Ls7 454

OK, .560/.580" does sound better to my memory than when I wrote .580/.600" the other day

Not sure what cam "LS7" and his sources are looking at in Post #2? Engineering does change specs from time to time....

George Kettler
o SOLD 8/2016 my beloved 1970 Elky 496.
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #9 of 32 (permalink) Old Oct 26th, 09, 3:07 PM
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Re: Ls7 454

I wonder how well that cam would work in a 496?

Kyle

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post #10 of 32 (permalink) Old Oct 26th, 09, 5:14 PM
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Re: Ls7 454

Quote:
Originally Posted by Adrian D. View Post
Quote:
Originally Posted by kettbo View Post
OK, .560/.580" does sound better to my memory than when I wrote .580/.600" the other day

Not sure what cam "LS7" and his sources are looking at in Post #2? Engineering does change specs from time to time....
George, the numbers in my link are correct.

You will notice that there are two different lift specifications in those two articles that Adrian posted.

The first article (lower left) has the correct numbers minus the specified lash.
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post #11 of 32 (permalink) Old Oct 26th, 09, 5:30 PM
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Re: Ls7 454

Maybe the .560 and .600 numbers you keep refering to are measurements taken @ .015".

http://www.geocities.com/MotorCity/D...00/cmspec.html

Quote:
2. Any value in parenthesis ( ) is calculated. All lobe centers and distance between lobe centers are calculated. These are not advertised values. As such, they may be inaccurate due to lobe ramps ground non-symetrically.
If mechanical, deduct lash from lift to get actual lift at Valve unless marked as @ .015".
http://books.google.ca/books?id=seOU...mshaft&f=false

In the above link you will also notice on page 55 that the '143' LS6/78/72 cam is listed as .500 lift when it is commonly known to many as a .520 lift.

It all depends on where it is being measured.

Last edited by LS7; Oct 26th, 09 at 9:20 PM. Reason: Added Link
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post #12 of 32 (permalink) Old Oct 26th, 09, 5:43 PM
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Re: Ls7 454

Quote:
3959180 - Mechanical Flat Tappet





This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees.
Technical Notes: Distributor P/N 1104067 or melonized distribuor gear P/N 1045613 must be used on all crate engines with steel camshafts.




Copyright 2000 General Motors Corporation.


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post #13 of 32 (permalink) Old Oct 26th, 09, 10:48 PM
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Re: Ls7 454

What kind of street manners would a factory cammed 12:1 LS7 have?

1966 Charger (383, 727 Torqueflight)
1970 SS 454 Chevelle (LS5+2, M22, 3.31 12 bolt)
1971 Malibu (350, M22, 3.31 12 Bolt)

I'm looking for a girl with a car, and a house..........with cable.

http://s160.photobucket.com/albums/t164/MEJ1990TM
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post #14 of 32 (permalink) Old Oct 26th, 09, 11:21 PM
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Re: Ls7 454

I would never use that old technology. I built a flat tappet 468 with oval port heads on it that made 670 h.p. right after an LS-6 made 452 h.p. on the same dyno. The torque on my motor was 632 and the torque on the LS-6 was 520. I think camshaft technology has came a long ways since the seventys, even with the flat tappet stuff. Granted mine had a little more compression and good port work in the heads but I bet I had less money in my motor than the guy had in the LS-6, he payed someone to go thru his. I've been in a car in the past that had and LS-7 in it with a roller cam and I can tell you that thing was a pussy cat compared this thing.
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post #15 of 32 (permalink) Old Oct 26th, 09, 11:24 PM
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Re: Ls7 454

Was it a true to form LS7 that was 12:1, rectangular port open chamber heads, with the bigger solid flat tappet?

1966 Charger (383, 727 Torqueflight)
1970 SS 454 Chevelle (LS5+2, M22, 3.31 12 bolt)
1971 Malibu (350, M22, 3.31 12 Bolt)

I'm looking for a girl with a car, and a house..........with cable.

http://s160.photobucket.com/albums/t164/MEJ1990TM
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