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Old 02-22-2011, 06:34 PM   #1
johnk320
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Default Z/28 cam (the 140 cam)

Are there any of these cams still out there? I remember a high school buddy of mine (back in 1970) put one of these cams in his 327 equipped '67 Chevelle. It ran like a banshee! I'm collecting parts for my 327 (w/mfi and vertex mag) and, if I can't find an Isky 505 magnum, I'd like to use one of these cams (GM p/n: 3727140).

Last edited by johnk320; 02-22-2011 at 07:12 PM. Reason: insert p/n
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Old 02-22-2011, 07:24 PM   #2
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Default Re: Z/28 cam (the 140 cam)

I got a new one. Nope it's not for sale.
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Old 02-22-2011, 07:29 PM   #3
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Default Re: Z/28 cam (the 140 cam)

I think the correct number is 3927140.
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Old 02-22-2011, 07:38 PM   #4
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Default Re: Z/28 cam (the 140 cam)

Any cam manufacturer worth dealing with can grind that profile for you. Call and ask em.
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Old 02-22-2011, 07:41 PM   #5
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Default Re: Z/28 cam (the 140 cam)

Isn't that the same as the 327 fuel injected camshaft? Solid lifter set at .030 both intake and exhaust. I built a 301 for a 57 chev in 1971 with one of those. Great power!
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Old 02-22-2011, 07:48 PM   #6
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Default Re: Z/28 cam (the 140 cam)

Google popped this up. More at:
http://www.camaros.net/forums/showthread.php?t=16324


Chevrolet Factory Cam Specs by part number
Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description
Small Blocks
3849346 Mechanical - 254/254 - .484/.484 - 114 - 327 365HP& Z-28 302
3863151 Hyd. - 221/221-.447/.447-114 - 327-350HP, L79
3896929 Hyd. - 195/202 - .390/.410 - 112 - 327 300 HP
3896962 Hyd. - 222/222 - .450/.460 - 114 - 350 L-46, L-82
3927140 Mechanical - 257/269 - .493/.512 - 112 - Off Road
3965754 Mechanical - 262/273 - .488/.509 - 112 - 2nd design road race, short track
3972178 ?
3972182 Mechanical - 242/254 - .459/.485 - 116 - 70 LT1 360 & 370HP, 71 LT 330 HP
10134334 Hyd. Roller - 235/235 - .480/.480 - 114 - 350ZZZ and ZZ2 Crate Motor
10185071 Hyd. Roller - 208/221 - .474/.474 - 112 - 350 345, ZZ3&4 Crate Motor
10224241 Hyd. Roller - - 92-94 GenII, LT1, 350
10243779 Hyd. Roller - - 94-96 Gen II, L99 265 V-8
12353914 Hyd. - 180/194 - .378/.401 - - GM Crane Lo speed Hi torque
12353915 Hyd. - 194/204 - .401/.423 - 104 - GM Crane street
12353916 Hyd. - 204/214 - .423/.446 - 110 - GM Crane 305-350 street legal 50 states
12353917 Hyd. - 204/214 - .420/.441 - 112 - GM Crane nan-emissions vehicles & off road
12353918 Hyd. - 214/224 - .442/.465 - 112 - GM Crane marine & off road
12353923 Hyd. - 224/234 - .465/.448 - 114 - GM Crane off road
12364050 ?
12364051 ?
12364052 ?
12364053 ?
12364054 ?
12370845 Hyd. Roller - 214/224 - .488/.509 - 112 - Off Road, lobe for mech fuel pump
12370846 Hyd. Roller - 222/230 - .509/.528 - 112 - Off Road, lobe for mech fuel pump
12370847 Hyd. Roller - 232/242 - .539/.558 - 112 - Off Road, lobe for mech fuel pump
12551142 Hyd. Roller - 203/210 - .476/.480 - 115.5 - 96 350 LT4 w1.6 roller rockers
12551705 Hyd. Roller - 201/208 - .447/.459 - 112 - 95-96 Gen II, LT1, w center dowel pin
14088843 Hyd. - 202/206 - .403/.415 - 115 - 305 HO, 83-86
14093643 Hyd. Roller - 202/206 - .403/.415 - 115 - 87 350 Corvette, IROC Camaro
24502476 Hyd. - 121/220 - .435/.460 - 112.5 - 350 300 crate motor
24502586 Hyd. Roller - 218/228 - .525/.525 - - 96 LT4 H.O.T. crate motor, use with 1.6 roller rockers
NA Hyd. Roller - 202/210 - .472/.478 - 111 - 97 Gen III LS1 Corvette 350 uses 1.7 roller rockers

Here is the 140 cam info in more detail, this is from crane who sells a copy of it:

Part Number: 968821 Grind Number: 3927140
Engine Identification:
Start Yr. End Yr. Make Cyl Description
Engine Size Configuration

Valve Setting: Intake .024 Exhaust .026 HOT
Lift: Intake @Cam 3286 @Valve 493 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3412 @Valve 512
Rocker Arm Ratio 1.5
Cam Timing: TAPPET @--
Lift: Opens Closes ADV Duration
Intake -- BTDC -- ABDC
Exhaust -- BBDC -- ATDC
Spring Requirements: Triple Dual Outer Inner
Part Number 99893
Loads Closed 120 LBS @ 1.875 or 1 7/8
Open 296 LBS @ 1.415
Recommended RPM range with matching components
Minimum RPM 4200
Maximum RPM 7000
Valve Float 7500
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 20.5 BTDC 56.5 ABDC 108 257
Exhaust 70.5 BBDC 18.5 ATDC 116 269


CENTERLINE
INT 108
EXH 116

LOBE SEP 112
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Last edited by Dzus; 02-22-2011 at 09:35 PM.
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Old 02-22-2011, 08:08 PM   #7
johnk320
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Default Re: Z/28 cam (the 140 cam)

Wow! Great responses, guys! Thanks!

My p/n info comes from the book, 302, The Definitive 1967-1968 Camaro Z/28 Fact Book by Jerry MacNeish. As listed in that publication, the 140 cam carries th GM p/n 3727140, solid lifter cam, offered for off-street use only, .022 int/.024 exhaust. The .030/.030 were the specs for the factory-installed street cam. This 140 cam was intended to be used with the 2X4 cross ram.
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Old 02-22-2011, 08:11 PM   #8
johnk320
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Default Re: Z/28 cam (the 140 cam)

@ Dzus - that 3927140 looks like it could be it! I wonder which number is correct? Both seem to be good sources....
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Old 02-22-2011, 08:24 PM   #9
johnk320
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Default Re: Z/28 cam (the 140 cam)

@ Dzus - The specs from Crane are similar and that grind # would bear out the p/n as being 3927140. Thanks...
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Old 02-22-2011, 08:26 PM   #10
johnk320
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Default Re: Z/28 cam (the 140 cam)

@ big duece - looks like you may be right on the p/n!
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Old 02-22-2011, 09:27 PM   #11
Dzus
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Default Re: Z/28 cam (the 140 cam)

Cheap repro 3927140: Melling 22400 , Elgin E-902-P, Clevite 229-1622

But the second design (3965754) may be hotter.
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Old 02-22-2011, 10:36 PM   #12
johnk320
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Default Re: Z/28 cam (the 140 cam)

@Dzus - Ahhh, I see what you mean about the 3965754... better duration, not quite the lift same centerline. Worth considering. Thanks for the suggestion.
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Old 02-22-2011, 11:29 PM   #13
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Default Re: Z/28 cam (the 140 cam)

3927140 - 1969 Service Mechanical - Open exhaust
Factory timing 40-82 Int/90-46 Exh
Factory duration 302 Int/316 Exh
Factory lift .463 Int/.482 Exh
Valve Clrnc .022 Int/.024 Exh

3965754 - 1971 Service Mechanical - Open exhaust
Factory timing 49-96 Int/96-55 Exh
Factory duration 325 Int/331 Exh
Factory lift .495 Int/.512 Exh
Valve Clrnc .022 Int/.024 Exh

Courtesy of How to Hotrod Smallblock Chevys (1972)
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Old 02-22-2011, 11:36 PM   #14
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Default Re: Z/28 cam (the 140 cam)

Quote:
Originally Posted by Engine man View Post
Isn't that the same as the 327 fuel injected camshaft? Solid lifter set at .030 both intake and exhaust. I built a 301 for a 57 chev in 1971 with one of those. Great power!
the 140 was the
"off road service cam". Much bigger than the fuelie cam. It really likes a stick shift and reasonable compression
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Old 02-23-2011, 01:25 AM   #15
rickyracer1962
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Default Re: Z/28 cam (the 140 cam)

when i was little we had a real 69 Z28 with a 302 and the off road cam, it was wicked. my mom drove it everyday too!
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Old 02-23-2011, 01:52 AM   #16
Deuces
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Default Re: Z/28 cam (the 140 cam)

Mine was Fathom green with the white stripes... Wicked car!
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Old 02-23-2011, 02:11 AM   #17
Shaggy
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Default Re: Z/28 cam (the 140 cam)

I'm gunna put one in my '64 el camino cross ram 302 when i get it on the road again, it sounds like it should be a fun one!
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Old 02-23-2011, 07:34 AM   #18
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Default Re: Z/28 cam (the 140 cam)

I ran the original off road Z-28 cam in both a 292 and a 301 - if you run a manual trans and 4.11 rear, it's can be a street monster. And when one of the above specs says that it dies below 4200 RPM - believe it!
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Old 02-23-2011, 07:44 AM   #19
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Default Re: Z/28 cam (the 140 cam)

Quote:
Originally Posted by Jmountainjr View Post
I ran the original off road Z-28 cam in both a 292 and a 301 - if you run a manual trans and 4.11 rear, it's can be a street monster. And when one of the above specs says that it dies below 4200 RPM - believe it!

I was going to mention if its the real deal it starts climbing up on the cam about 4K and is good to about 8K. I had a factory Z-28 302 in a '64 Chevelle wicked fast and sounded like a swarm of bees comming down the pike.

I like a lot of engines for different purposes but you just can't beat a high winding SBC. High rev cruising is a rush.
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Old 02-23-2011, 08:03 AM   #20
johnk320
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Default Re: Z/28 cam (the 140 cam)

OK... so as some of you who have replied here already know, my app is going to be used primarily on the street (but some passes down the 1320). I was thinking of picking up a B&M Hydro to keep with the trad gasser theme but many have indicated a four speed would be better. I figure these "off-street" cams needed to drive through the its, down return roads, etc. and as long as you brrrp 'em every once in a while to keep 'em from loading up you're good. I want a cam like this cause the power curve would be in the range for the mfi to make its best power.

Thoughts on this? Keep in mind that Hilborn sez that mfi isn't for street use either... MANY have successfully done it though!
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