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Camshaft selection problem

Old Oct 26, 2013 | 02:58 PM
  #1  
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Camshaft selection problem

Hi there, first time poster but long time reader here. Just had a quick question regarding selecting a cam. The motor is a 350 project. Something that will be just driven around on the street, no crazy performance need.
The specs on the cam are:

Crane Solid lifter 238 duration at .050 lift (int and exh) 300 degrees duration, 114 lobe centers, 480 lift on intake and exhaust.

The specs on the head are:
Cast iron Hydraulic flat tappet

Basic Operating RPM Range:1,400-5,700
Intake Duration at 050 inch Lift:219
Exhaust Duration at 050 inch Lift:227
Duration at 050 inch Lift:219 int./227 exh.
Advertised Intake Duration:262
Advertised Exhaust Duration:268
Advertised Duration:262 int./268
Valve Lift with Factory Rocker Arm Ratio:0.468 int./0.489 exh.
Lobe Separation (degrees):112

Woulld this be a compatible combinatin?
Any advice you can give me here would useful.
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Old Oct 26, 2013 | 03:39 PM
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Re: Camshaft selection problem

What heads is it going with?

What is the ACTUAL compression ratio? (including the MEASURED, not "assumed", deck clearance in the "calculator")

What's the rest of the car? (weight, converter, gears, exhaust, induction system)
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Old Oct 26, 2013 | 03:45 PM
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Re: Camshaft selection problem

Originally Posted by giannyboy53
Hi there, first time poster but long time reader here. Just had a quick question regarding selecting a cam. The motor is a 350 project. Something that will be just driven around on the street, no crazy performance need.
The specs on the cam are:

Crane Solid lifter 238 duration at .050 lift (int and exh) 300 degrees duration, 114 lobe centers, 480 lift on intake and exhaust.

The specs on the head are:
Cast iron Hydraulic flat tappet

Basic Operating RPM Range:1,400-5,700
Intake Duration at 050 inch Lift:219
Exhaust Duration at 050 inch Lift:227
Duration at 050 inch Lift:219 int./227 exh.
Advertised Intake Duration:262
Advertised Exhaust Duration:268
Advertised Duration:262 int./268
Valve Lift with Factory Rocker Arm Ratio:0.468 int./0.489 exh.
Lobe Separation (degrees):112

Woulld this be a compatible combinatin?
Any advice you can give me here would useful.
You really don't want a solid lifter cam unless you want to be adjusting your lifters periodically. Hydraulic flat-tappet or hydraulic roller tappet is what you want. They are pretty much "set and go".

Otherwise, to give good info, you'll need to get the info Sofa wants. )
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Old Oct 26, 2013 | 03:59 PM
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Re: Camshaft selection problem

Originally Posted by sofakingdom
What heads is it going with?

What is the ACTUAL compression ratio? (including the MEASURED, not "assumed", deck clearance in the "calculator")

What's the rest of the car? (weight, converter, gears, exhaust, induction system)

Thanks for the quick response. Tbh i actually am not sure regarding any of those things. The block casting number is 3970010, it is entirely factory. The car its going into is a 1987 camaro convertible, current motor is a 305 with a 4barrel. Exhaust is stuck for the moment, induction system is naturally aspirated with a holley 650 carb
The heads are after market and i am unsure of the actual details other than what i have posted since that is all the guy i bought em from was able to tell me
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Old Oct 26, 2013 | 04:00 PM
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Re: Camshaft selection problem

Originally Posted by Ozz1967
You really don't want a solid lifter cam unless you want to be adjusting your lifters periodically. Hydraulic flat-tappet or hydraulic roller tappet is what you want. They are pretty much "set and go".

Otherwise, to give good info, you'll need to get the info Sofa wants. )
I was debating that, but i only use my car 3 months of the year, weekends only pretty much. So i figure adjusting it every season cant be too bad.
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Old Oct 26, 2013 | 04:01 PM
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Re: Camshaft selection problem

3970010, it is entirely factory.
Then no, that's not a good cam choice.

Get more details and maybe we can help you pick out something a better match to a low-compression 70s smogger motor.
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Old Oct 26, 2013 | 06:00 PM
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Re: Camshaft selection problem

He does have aftermarket heads. So maybe they're smaller 64cc chambers on top of a factory dished-piston long block. If that's the case, the compression would be around 9:1 and the cam would probably work pretty well.

But we'd need to know WHAT aftermarket heads it has on it. There should be stampings/casting marks that could give some clues as to what they are.
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