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Old 01-05-2011, 01:06 AM
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30/30 cam specs

Can anyone tell me the spec's on a (30--30) sbc camshaft? I have one that came in a motor I bought. It does not have a part# on either end but I did find some other marks----EP1,---D6----14 and a blue stripe. The previous owner said it is a 30---30 solid lifter cam,,it did have the solid lifters as well and it was made by COMP.CAMS. thanks BP

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Old 01-05-2011, 03:51 AM
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All comp cams are stamped with either the catalog part number or the grind number. If its not there, its not a comp cam.

The "30-30" cam is 254-254@.050" .485" lift 114LSA.
The lash is .030" in and ex. Installed Intake C/L is 110deg.

Published advertized duration varies depending on the checking height.

It was used in the 64 up 327-365hp and 375HP fuelie (corvette)
It was used in the 67-68-69 302 -290hp Z/28 (Z/28 Camaro)
It was last used in the 1970 350 LT-1 360hp and 370hp Z/28 Camaro and LT-1 Corvette. with manual trans.

It does not like low compression. It needs a 3500+ stall and big gears.
4000-6800rpm power range.

Unless you measure the cam you have, don;t assume that this is the cam specs of your cam. Measure the cam lobe lift on your cam. Should be .3233`

Crane sells a `Blueprinted`copy.
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Old 01-05-2011, 04:01 AM
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30=30 specs

The guy wasn't sure if he bought it from Comp. or Crane, would the lack of part #'s make you think Crane or GM maybe.? BP
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Old 01-05-2011, 08:26 AM
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Do you want to know what cam you really got or 150 internet opinions.

measure the lift
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Old 01-06-2011, 04:26 AM
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30---30 specs,

10- 4 , and thanks. BP
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Old 01-06-2011, 10:27 AM
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Quote:
Originally Posted by F-BIRD'88
Do you want to know what cam you really got or 150 internet opinions.

measure the lift
A very profound statement F-Bird'88 on many levels.
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Old 07-19-2014, 07:54 PM
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man you are sure right about liking big gears , i got a 327 and it loves 5.86,s
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Old 07-19-2014, 10:31 PM
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Cool

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Originally Posted by Biscayne327 View Post
man you are sure right about liking big gears , i got a 327 and it loves 5.86,s

Ha ha ha.... no doubt, no doubt there. Enjoy
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Old 07-20-2014, 04:11 AM
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A GM cam will have a pink paint marking on it.
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Old 07-20-2014, 07:36 PM
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repro of the Duntov 30/30

Those cams are reproduction of the cam Zora Duntov designed for the Mech FI 327 back in the 60s. They are a noisy cam in the low rpms.
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Old 07-21-2014, 02:10 AM
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Quote:
Originally Posted by F-BIRD'88 View Post
The "30-30" cam is 254-254@.050" .485" lift 114LSA.

It was last used in the 1970 350 LT-1 360hp and 370hp Z/28 Camaro and LT-1 Corvette. with manual trans.
. Although the 370HP LT1 350" was listed in early 1970 Corvette advertising literature, it supposedly never actually went into production and a 244/254 cam was used instead and all engines were the 360HP... to give the new LT1 a fatter street torque curve than the 302"...

. I don't know if the 30/30 cam had to actually have .030" lash... or it was just to keep the HP down and the drivability up... need re-adjusting less often... tighten the lash up for racing... giving more lift/more duration...
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Old 07-21-2014, 04:04 AM
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The origional intended valve lash was tighter, about .022" .024" ish but the idle, and low
End torque, "drivability" sucked. The larger .030" lash reduced running duration
And increased idle quality etc.
The "178" revised cam with 242-254 on 116 lsa cam
Was introduced when the ato trans was offered in the z/28 and vette. Late 70.
71. The 242 intake lobe is the same cam lobe used on the 396/375 427/425 and 454/450 hp
Street bbcs. .306" cam lobe lift. .024" lash. Its about 284 deg at .020".
And aysymetrical design. The exhaust lobe (254 deg) is the same as the 30-30 cam.

This dual pattern 242-254 116lsa cam makes for a good street nitrous cam or blower cam.
If you want more valve lift use 1.6 or 1.65 rockers.

If say you want a more snotty version with a rougher idle and hard mid range hit
Get these cam lobes custom ground on tighter 106- 108 or 110 lsa as required.

Or get a single pattern 242-242 cam version on the desired custom LSA.
Again, swap rocker ratio as desired.

Last edited by F-BIRD'88; 07-21-2014 at 04:15 AM.
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Old 07-21-2014, 04:49 AM
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unless you're building a #'s match,chalk mark resto.. today why would you even run that cam??
it gives up so much everywhere but WFO AND 5000RPM+
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Old 07-22-2014, 09:11 AM
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Perhaps use the cam that is used in this article

L84 Fuelie Motor On Engine Dyno - Vette Magazine - View All Page

My Father bought a crate L76 327 (same longblock as fuelie 375hp L84, just rated at 365hp with a 4bbl).

His best running was with dual 4bbls, 5.13 gears, 4 speed trapping at 7200rpm. Low 14's was the result. This was Dad's daily driver.

In this car (when Dad was selling idiamondback in the early 70's)


Same car-1995(Diamondback at car show Dad and Mom hosted, trailered by then owner)


Same car in 2008(on trailer in Dad's driveway-Dad's Sothern Belle on the ground) diamondback was bought by to be restored, but another car was used to build clone #1



Clone #1 2008


Left to right
Diamondback, Southern Belle and Clone #1


Fins


Diamondback in 2013, back in Dad's driveway, back in the family after 40 years.

Of course minus the L76.
The 30-30 was great for its day, but so much technology has advanced, a newer grind is in order for most applications.

peace
Hog
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Old 07-22-2014, 01:57 PM
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Quote:
Originally Posted by Hogg View Post
My Father bought a crate L76 327 (same longblock as fuelie 375hp L84, just rated at 365hp with a 4bbl). His best running was with dual 4bbls, 5.13 gears, 4 speed trapping at 7200rpm. Low 14's was the result. This was Dad's daily driver.
. Seems about 10/10ths or more slow for the power and gear... must have been the skinny tires...
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