Canfeild heads/ Please look over this flow sheet and tell me what carb/cam to run with it.

[Red5]

http://www.megapathdsl.net/~mimsk/Pi.../flowsheet.jpg http://www.canfieldheads.com/sbc_2500.html Im putting these heads on a 91 L98 block with 5k on the stock block. Im thinking about using a non-roller cam. Tell me what Im looking at or perhaps make a suggestion as to what I can combo up with these heads to get good throttle resonse and hp. Thanks, Matt

[Red5]

:seeya

[korvetkeith]

You shouldn't need much lift over .500 as the flow only increases 3cfm at .600, just get a cam with decent duration at .500 and save money on fancy valvetrain parts.

[vettedave]

What RPM range do you want it to run ? If you want High RPM power with
a rough idle non roller cam I would go with a 292 Isky Mega cam or Comp
Cams Extreme Energy equiv. Victor Jr. Man. and Demon 750 Carb.
Should put you at 450 + - HP at around 6500 RPM :chevy

[The Green Rocket]

Just because flow only increases 3 cfm from .500 lift to .600 lift does not mean that you will not make appreciably more power with a cam of more than .500 lift.

Here's why:
Hypothetically lets assume the SAME cfm at .500 and .600 lift.
.500 lift will only see max flow at one lobe point of lift.
Anything up to .600 lift will see max flow between the two .500 lift points of the lobe.

There are other considerations to be made, but I can assure you that more power will be made if the cam has more than .500 lift.

Thomas

[Red5]

Tom,
If I go with more lift then will I need to buy additional lifters and other stuff or will I be able to re-use some of the stock stuff?

Thanks,

Matt

[Clink69]

Just because flow only increases 3 cfm from .500 lift to .600 lift does not mean that you will not make appreciably more power with a cam of more than .500 lift.

Here's why:
Hypothetically lets assume the SAME cfm at .500 and .600 lift.
.500 lift will only see max flow at one lobe point of lift.
Anything up to .600 lift will see max flow between the two .500 lift points of the lobe.

There are other considerations to be made, but I can assure you that more power will be made if the cam has more than .500 lift.

Thomas

You hit it right on the nail head?? any way I used Canfield 195s in my setup and had the lift around .520 for this reason. Used 1.6 rollertip rockers. You can see some pics and engine specs for my 383 at:

http://forums.corvetteforum.com/zerothread?id=219513

My HP peaks out quite early , around 5000 but I think with some more tuning I'll get it to around 450 at the fly. But look at that TQ... :D
:flag

[korvetkeith]

Just because flow only increases 3 cfm from .500 lift to .600 lift does not mean that you will not make appreciably more power with a cam of more than .500 lift.

Here's why:
Hypothetically lets assume the SAME cfm at .500 and .600 lift.
.500 lift will only see max flow at one lobe point of lift.
Anything up to .600 lift will see max flow between the two .500 lift points of the lobe.

There are other considerations to be made, but I can assure you that more power will be made if the cam has more than .500 lift.

Thomas

You don't understand what I'm saying. If both cams have the same duration at .500 but one peaks at .600 while the other stays at .500 they will make similar power and the larger cam is just going to cause more valvetrain wear.

[Red5]

So if I want a lot of HP and Tq then what cam would be the best way to go?


Thanks,

Matt

[Red5]

I decided to stay with a roller cam set up, that way I can use the same equipment I have. I have also discovered that I don't want to lift more than .55 max. I want the motor to be able to idle at 600 rpm and rev to about 6500 rpm, I want HP in the mid to upper rpm range.

Please suggest a good cam for this.

Thanks,

[fwayne]

You don't understand what I'm saying. If both cams have the same duration at .500 but one peaks at .600 while the other stays at .500 they will make similar power and the larger cam is just going to cause more valvetrain wear.

I don't think such a cam exists. A cam with a peak lift of 0.5 is not going to have much duration (if ANY) at 0.5. It's possible, especially with flat tappet cams that don't produce as much valve acceleration as rollers, that the highest lift will be momentary, meaning that it is acheived for zero degrees. A cam that peaks at 0.6 will have much more duration at 0.5.


[Modified by fwayne, 2:13 PM 2/5/2002]

[fwayne]

I decided to stay with a roller cam set up, that way I can use the same equipment I have. I have also discovered that I don't want to lift more than .55 max. I want the motor to be able to idle at 600 rpm and rev to about 6500 rpm, I want HP in the mid to upper rpm range.

Canfield makes it sound like the dual springs that come with the heads are good for 0.600" lift, but they don't specifically give the installed and solid heights. They also have a roller cam spring that's different from those supplied with the assembled heads. If the bare heads are cut for stock springs, be advised that a single spring may have a limit of 0.525" or less. I don't know what you're buying, but make sure the spring you end up with can handle 0.550".

[Red5]

Supposedly they are rated for up to .55 lift. But I would feel more comfortable around the .5 area. Got any good ideas for a cam?