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Old 06-28-2012, 12:41:32 PM   #1
69Z28FREAK
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What is the best cam for 1970 LT1 Motor

Which cam should I use in a 1970 LT1 motor. It's going in a 69 Camaro
Rear Gear 3:73
Trans M20
11:1 Comp
492 Angel Plug Heads 2.02 valves
780 Holley

Here are some cams I am looking at. I want something that will sound like this and perform well and be reliable and drivable. The best of all worlds.

http://www.compcams.com/base/multime...ompcams278.mp3

Stock GM cam that was in the LT1
3972182 Mech. 242/254 .459"/.485" 11.0:1 116

GM 140 Off Road Racing Cam First Design
3927140 Mech. 257/269 .493"/.512" 12.0:1 112

Ultradyne
531259 278/282 .248/252 & 530/541 108

2 other suggestions


Last edited by 69Z28FREAK : 06-28-2012 at 12:45:40 PM.
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Old 06-28-2012, 12:52:30 PM   #2
COPO
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This time I went with Solid lifter Crane Part Number: 113841 Grind Number: F-278-2 (REPLACES CC-278-2)

It sounds better than the LT1 while cruising.

Crane Cams 113841 Mechanical Flat Tappet
Specifications:
• Advertised duration: 278 intake/288 exhaust
• Duration at .050 in.: 238 intake/248 exhaust
• Gross valve lift: .480 in. intake/.500 in. exhaust
• Lobe separation: 114 degrees
• RPM range: 3000 to 6500
• Moderate performance usage with centrifugal or Roots supercharger
• Good mid-range torque and horsepower
• 10:1 to 11.5:1 comp ratio recommended for naturally aspirated engines
• 1955-57 265 cid. engines need an oiling groove machined into the rear journal of the camshaft.

Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6800
Valve Float 7400

Also using 1.52 Comp Magnum Roller Tip Rockers, part # 1412-16

I was told by my engine builder that if I went over .500 that I would need head work.
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Last edited by COPO : 06-28-2012 at 12:54:57 PM.
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Old 06-28-2012, 01:00:32 PM   #3
High Country Z
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This is what I run, I'm happy with it: http://www.lunatipower.com/Product.aspx?id=1965&gid=283
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Old 06-28-2012, 01:38:47 PM   #4
muscl car
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i'm running a 1970 LT1 but still running the 11.1:1 pistons ,186 cyl heads and a old GM mech flat tappet cam ...GM#140 gen 1 off-road mech flat tappet 257/269 @ .050

click on this link to listen .....my old school camaro idle video
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1972 chevy camaro ss

1970 LT1 350sbc / 425hp 11.1:1 comp, GM #140 off-road solid lifter cam ,holley strip dominator
2" open spacer and holley 750dp ...........all old school 70's performance parts

old school pic

my old school camaro idle video
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Old 06-28-2012, 01:39:47 PM   #5
rockheadrocks
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I'm voting for the #140 cam. Bolt on a set of decent headers, and that's what this cam was MADE for.
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Old 06-28-2012, 01:51:36 PM   #6
muscl car
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Quote:
Originally Posted by rockheadrocks
I'm voting for the #140 cam. Bolt on a set of decent headers, and that's what this cam was MADE for.


^ + 1000 on that the 140 cam works awesome in my motor and comes alive at about 4k rpm and pulls F'n hard
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baldwin motion phase III Z/30 clone


1972 chevy camaro ss

1970 LT1 350sbc / 425hp 11.1:1 comp, GM #140 off-road solid lifter cam ,holley strip dominator
2" open spacer and holley 750dp ...........all old school 70's performance parts

old school pic

my old school camaro idle video
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