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Old 15th-June-2006, 08:57 AM   #1
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Question Camshaft

Camshaft question What would be a good recommendation for Hyd camshaft for 350 -650 Holley-headers-4 spd- 3:73 rear?

I don't race , just street but want a real radical idle-sound. I have the Summit 1106- 292/488 but not quite good enough sound.
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Old 15th-June-2006, 09:05 AM   #2
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Greetings,

Here's what I use for a radical sound (to say the least!)...Comp Cams 292H cam. It's 242 duration at 50 degrees and 501 lift. It sounds great at idle and while going down the road.

Jason
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Old 15th-June-2006, 09:08 AM   #3
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Get one of the factory vette solid lifter 350/365 or 350/375 cams. They have a ton of duration and overlap and sound pretty thumpy. If you actually want it to run right, however, you're gonna need 11:1 compression.

Why do you want a racecar sound without the racecar? This question would give Paul Wright a brain anuerism.

Kev
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Old 15th-June-2006, 09:27 AM   #4
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Quote:
Originally Posted by novaboy009
Why do you want a racecar sound without the racecar? This question would give Paul Wright a brain anuerism.
cause thats what he wants.
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Old 15th-June-2006, 09:39 AM   #5
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Quote:
Originally Posted by novaboy009
Get one of the factory vette solid lifter 350/365 or 350/375 cams. They have a ton of duration and overlap and sound pretty thumpy. If you actually want it to run right, however, you're gonna need 11:1 compression.

Why do you want a racecar sound without the racecar? This question would give Paul Wright a brain anuerism.

Kev
I want that mean cruizin sound. Too expensive to race.
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Old 15th-June-2006, 09:44 AM   #6
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Quote:
Originally Posted by JR
I want that mean cruizin sound. Too expensive to race.
get a cam with lots of duration and overlap....the car will likely be sluggish in the lower rpms and will come to life in the higher rpms.....BUT it will have a ratty idle
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Old 15th-June-2006, 09:48 AM   #7
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BOOM!!!............ Yep, that was Paul's head exploding. How sad

Kev
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Old 15th-June-2006, 09:55 AM   #8
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Would you have a suggestion on the specs?
JR
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Old 15th-June-2006, 10:00 AM   #9
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Quote:
Originally Posted by novaboy009
BOOM!!!............ Yep, that was Paul's head exploding. How sad

Kev

Not everybody has the same goals as Paul.....Paul lives in a world where getting every last bit of HP is the name of the game heck its more then just the name of the game it IS the game this is also a place where "form ALWAYS follows function"....most of us do not live in that world and that gives us the latitude to change the rules a bit, to suit what we want our cars to do, so that sometimes "function follows form". This is one of those cases.

But ya the ratty idle comment was for Paul
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Old 15th-June-2006, 10:10 AM   #10
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Think of positive side , you can run low octane gas with no problem becuase the DCR will be so low. Thats assuming your compression ratio now is around 9-1.
The other plus thing is you have a manual, so you don't have to worry about getting a bigger stall.
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Old 15th-June-2006, 10:11 AM   #11
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You don't need a lot of duration, just put the lobes close together. Crane has a few cams ground on 106° lobe centers that will give you the drive-thru idle, like the 282 H06. This will keep your cylinder pressure up and the cam won't be so lazy up until 3500 rpm. Note that it is set at 101°ILC. They're the H06 series on this page:

http://www.cranecams.com/index.php?s...262-400%20C.I.

You should keep the exhaust system as a true dual setup with no crossover. Don't use much initial timing, this will make the idle poor. You can use a dual plane manifold and lean one side way out at idle, it will stumble on half the cylinders. Just don't put any of your timeslips in the window....
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Old 15th-June-2006, 10:14 AM   #12
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Yah, I'm well aware of all that. I was mostly pulling Paul's chain.

How much cruising will you be doing JR? Are you willing to run on hightest? What's your current compression ratio? What heads do you have?

I'd shoot for something with lower lift if it has stock heads. Most of them are all done by .450 lift anyway. You want all sorts of duration though, lots of advertised duration and plenty of .050 duration. Do you want solid lifters or hydrallics?

A GM 30/30 cam comes to mind as having a wonderful thump thump thump to it. The old factory cams are really outdated, so they ramp up nice and slow and need lots of duration/lift. Perfect for that ratty idle noise.

Kev

EDIT: Great idea on moving the lobes Mike. That'll keep it a lot more driveable and chop it up a good bit.
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Old 15th-June-2006, 10:19 AM   #13
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Quote:
Originally Posted by JR
Would you have a suggestion on the specs?
JR
JR, there are tons of cams that will do what you want. You should easily fiund one that will give ya the idle that your looking for. BTW as with all cams the "basic operating rpm" they are talking about is with the right valve springs etc etc, just installing the cam will not suddenly make a casr with stock or nearly stock springs be able to reve to 6000rpm+ And the springs are just the tip of the ice burg there are ather variables that will effect your ultimate rpm capacity. But anyway here are a few grinds that I am confident will give you the ratty idle you looking for. I've listed your current cam first followed by some cams from Crane...they are in no particular order and I personally have no preference...

Current cam:

summit cam

SUM-1106

Basic Operating RPM Range: 3,000-6,200 RPM
Duration at 050 inch Lift: 234 int./234 exh.
Advertised Duration: 292 int./292 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.488 int / 0.488 exh. lift
Lobe Separation (degrees): 114


Crane Cams grinds

grind number: H-244/3439-2S-6

Basic Operating RPM Range:3400-7000
Duration at 050 inch Lift: 244/252
Advertised Duration: 300/308
Valve Lift with Factory Rocker Arm Ratio:0.516 / 0.525 lift
Lobe Separation (degrees):106 (I believe..the crane site doesnt say)


grind number: H-238/3347-2S-6

Basic Operating RPM Range:3200-6800
Duration at 050 inch Lift: 238/244
Advertised Duration: 294/300
Valve Lift with Factory Rocker Arm Ratio:0.502 / 0.516 lift
Lobe Separation (degrees):106 (I believe..the crane site doesnt say)


H-308-2 (REPLACES CCH-308-2)

Basic Operating RPM Range:3400-7200
Duration at 050 inch Lift: 246/254
Advertised Duration: 308/316
Valve Lift with Factory Rocker Arm Ratio:0.495 / 0.510 lift
Lobe Separation (degrees):114 (I believe..the crane site doesnt say)

BTW remember to use any cam with increased lift will requre that you verify you have enough clearance....also changing lobe centers will effect your available clearace even if the cam have the same lift. Normally speaking the tigher the lobe centers the wilder the idle will be, the less vaccum created and the wider the power band will be. The wider the lobe centers the smoother the idle, the more vaccum created, and the narrower the power band will be....just some thoughts for you...Good luck
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Last edited by 69NovaSS; 15th-June-2006 at 02:36 PM.
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Old 15th-June-2006, 10:22 AM   #14
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Quote:
Originally Posted by Mike Goble
You don't need a lot of duration, just put the lobes close together. ...
Very good point....much better idea than cranking the duration......the crane saturday night special series of cams are ground on the 106 lobe center.....
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Old 15th-June-2006, 10:37 AM   #15
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Jr, here are two from crane with a 106 degree lobe center that might just be the ticket for ya

part number 110592
@.050 duration: 228/234
advertised duration:284/290
lift .480/.494
rpm range: 2800-6400


part number 110182
@.050 duration: 230/230
advertised duration:286/286
lift .465/.465
rpm range: 3000-6400

I sorta like the first one
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Last edited by 69NovaSS; 15th-June-2006 at 10:42 AM.
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