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Topic: LS4 cam specs

in Forum: C3 Engines

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LS4 cam specs (1/6)
4/7/07 10:38am

yellow73454
Former Member
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Paducah, KY - USA

Vette(s):
Yellow 1973 coupe, 454, 4 spd.,factory air. White 1965 two top 4spd. 327, factory air. Red 1981 unmolested.

Joined: 4/6/2007
Posts: 4

Hi everyone out there. I need some help and or advise.

I have a stock LS4, 73 454, that needs a new cam. The engine is apart now. It doesn't seem to have the original cam. What it had was cast # GM 4 3041. My "Corvette by the numbers" book says it should be #353041 and specs don't make sense.

I am trying to find out what the stock cam specs were. Then, I'll be able to choose a replacement that is a notch or two better.

I'm thinking of a Crane duel pattern Power Max 260/272,advertized duration .485"/.515"gross lift, RPM range 1500-4500.

HELP

Thanks

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LS4 cam specs (2/6)
4/7/07 4:14pm

Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398

My book gives the same specs yours does. Remember engines were primarily designed for low emissions during the time your car was built...not pure performance.

I'm no expert on camshaft specs, but I would suggest you decide exactly what performance level you want out of your engine and base your cam selection on achieving that goal. Crane, Comp, Edelbrock or any other cam maker will give you good recommendations on the best cam for your car.

There are somebuilders who say to select whatever cam you think you need, and go one milder than that. I guess they think most people choose a cam too aggressive for what their real needs are.

BTW - though I have no personal experience with them, I have heard wonderful things about the Lunati VooDoo cams.

LS4 cam specs (3/6)
4/7/07 6:43pm

2 cruzn

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Poquoson, VA - USA

Vette(s):
73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.

Joined: 11/20/2004
Posts: 1023

Here is a pretty informative site for lots of '73 stuff...

http://www.corvetteforum.net/c3/vette73/index.htm

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LS4 cam specs (4/6)
4/7/07 7:06pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20201

I can't help with the exact specs on da cam, but...Lunati, and Comp Cams have "Retro" cams available for replacing stock cams in older cars. They are not exact copies, but they do work a little better than the stockers, since they are not strangled by EPA guidelines, as the factory cams were. Might give one of these companies a shot.

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LS4 cam specs (5/6)
4/7/07 7:48pm

I just checked and that is a great site for a wealth of info on the 73. But, no cam specs.

Thanks.

LS4 cam specs (6/6)
4/9/07 12:49pm

UP DATE: I found on Corvette forum where someone asked the same question.

70-72 LS5 73-74 LS4

.461"/.480" lift .440"/.440" lift

214/218 deg. duration 210/210 deg. duration

115 lobe centerline 115 lobe centerline

I'm going to install a hotter Crane Power Max 260/272 deg. .485/.515 lift that I have been told, by a Vett restorer in ILL., it will work fine with everything else stock. Approve

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