Camshaft selection problem
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.
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.
Joined: Sep 2005
Posts: 28,022
Likes: 2,496
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
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)
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)
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: 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.
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.
Otherwise, to give good info, you'll need to get the info Sofa wants. )
Re: Camshaft selection problem
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
Re: Camshaft selection problem
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. )
Otherwise, to give good info, you'll need to get the info Sofa wants. )
Joined: Sep 2005
Posts: 28,022
Likes: 2,496
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Camshaft selection problem
3970010, it is entirely factory.
Get more details and maybe we can help you pick out something a better match to a low-compression 70s smogger motor.
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.
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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