Cam shaft

Building a 350 and was wondering what would be a good cam shaft to go with I want a good running one but want power and people to know it has a good motor in the vehicle

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

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

You need to check the head casting numbers. I'd bet you need heads too,if it's on the 81 in your first post. Probably 624 castings,low compression,low flow,smog heads,bigger cams need more compression. And you probably don't have any. Yep you can put in a big cam,it may sound mean,but it won't run like it should. The rumpity rump cams the guy in the next car can hear,NEED compression,rear gears,and probably a looser torque converter.

Don’t forget piston to valve clearance. Generally they don’t like touching.

Sorry I have 202 heads and engine is 0.400 over have a brand new cam already was just hoping for maybe better one mine is

Those specs are almost the same as the old 350 horse hydraulic 327 cam.......L79 option......good cam!!

You said you are “building” a 350, so does that mean you are replacing pistons or making other changes that would increase compression or improve head flow?

That 222/222 cam works with a stock low compression engine, but as Ricko1966 said, the low compression heads are a poor match to that cam. GM used a similar duration cam in the 350/290 hp crate engine, but it sounded better than it performed because the compression was about 8.2-8.5.

Back when these engines were new they used to swap in what was called an “RV” cam, which was usually a duration of about 214 to 218, and it seemed to work well. You also need to consider your gears and transmission. My K25 has 4.10 gears (good), but a stock TH350 and a lot of weight to get moving. It pulls well, but will never be quick.

Drivingjenny said:

Building a 350 and was wondering what would be a good cam shaft to go with I want a good running one but want power and people to know it has a good motor in the vehicle

Click to expand...

Comp Cams 268H

The cam you have is a nice choice for a basic 350 in a truck.

There's always something better.

Often times its a can of worms leading to hundreds or thousands of additional costs.

No one will spend your money faster than strangers on the internet.

I'd rock the cam you already have, it's a good cam

Drivingjenny said:

Sorry I have 202 heads and engine is 0.400 over have a brand new cam already was just hoping for maybe better one mine is

Click to expand...

2.02 is valve size what are the head casting numbers and are you running flat top pistons? If you are running large chamber heads and flat tops that engine is basically a clone of the 350/290 hp gm crate engine do some internet research regarding that engine and Camshaft. I say that engine needs more compression or less cam.

Comp cams Xtreme 4x4 218/226