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Old 03-06-2007, 06:14 PM
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Isky Z-35 cam question

Has anyone ever used an Isky Z-35 camshaft in a Big Block? I've heard a lot about "Hot" cams killing low-end torque. Is this cam a real torque killer? Isky recommends a 2800 stall converter, but I really don't want to go above 2500. (I want the car to be a summer Daily Driver)

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Old 03-06-2007, 07:54 PM
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I don't see where Isky offers a Z35 for a BBC. There is a Z45 that recommends a 2,500 stall converter. Makes power 2,500 to 6,500.
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Old 03-06-2007, 08:07 PM
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Quote:
Originally Posted by Sir Joab
Has anyone ever used an Isky Z-35 camshaft in a Big Block? I've heard a lot about "Hot" cams killing low-end torque. Is this cam a real torque killer? Isky recommends a 2800 stall converter, but I really don't want to go above 2500. (I want the car to be a summer Daily Driver)
It all depends on your setup, gears, CR,tranny..etc. But if your planning to use your car as a daily driver(in the summer) you may want to go a little lower on you choice...but again its hard to say not knowing your setup. I do know that after doinng alot of research about isky, and this particular cam, it's supposed to be a great cam ground on a 108lca but the power doesnt start to come in until about 3,000 rpm and is mainly used in higher rpm engines. Take a look at the z-45, it recommends a 2500 stall converter, but we need more info about ur setup
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Old 03-06-2007, 08:10 PM
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Quote:
Originally Posted by techinspector1
I don't see where Isky offers a Z35 for a BBC. There is a Z45 that recommends a 2,500 stall converter. Makes power 2,500 to 6,500.
If you go to iskycams.com it does list the z35 for bbc from the 396 to the 454, although i havent herd of many people using them in big blocks
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Old 03-06-2007, 08:12 PM
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Quote:
Originally Posted by 73camaro
If you go to iskycams.com it does list the z35 for bbc from the 396 to the 454, although i havent herd of many people using them in big blocks
OOOPS my mistake, it's the z-33... z35 is for sbc
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Old 03-06-2007, 08:17 PM
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Do you really need to make power to 7,000 with a BBC? If not, back off to the Z45, use a 2,500 stall converter and make power to 6,500.
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Old 03-06-2007, 08:22 PM
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Quote:
Originally Posted by F-BIRD'88
if you want a BBC street cam that makes good power, is easy on the valvetrain, will work just fine with a 2500stall and a bit of gear (3.73) get the GM 454/450hp LS6 cam or the Crane blueprint copy. It's a very sweet street cam that you won't get tired of. Specs are 242/242@.050" .520" lift 114LSA. Seat duration is right about 284deg. lash is .024-.026" you can vary it down to .020" or up top .028"
You can still buy this cam new from GM. Crane and Comp both have a blueprint copy available. The overall balance between easy street driving and power is very good.
the cool mild rumpity loop and lifter sound at idle is very sexy.
You're right about it being easy on the valvetrain with the very long ramps. 114 LDA will give excellent manifold vacuum for brakes, etc. I'm a big fan of solids.
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Old 03-06-2007, 08:41 PM
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Sorry, here's the whole setup:

BB Chrysler, destroked to 400.

Car: 2800# Dodge dart.

Rear-end: 3.73

Tranny: 727 torqueflite

Last edited by Sir Joab; 03-06-2007 at 08:49 PM.
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Old 03-06-2007, 10:01 PM
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Thanks guys. That's exactly the information I need.
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Old 03-06-2007, 10:22 PM
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Posted by F-BIRD'88:
"this cam does not have big long ramps"

Compared to an extreme energy Comp of about the same duration, it certainly does have big long ramps. The Chevy cam has total intake ramp figures of 65 degrees. A comparable Comp cam has total intake ramp figures of 38 degrees. I'll concede that the Chevy cam is measured at lash point and the Comp is measured at 0.006", but there wouldn't be more than 5 degrees less on the Chevy cam at 0.006", so it's about 60 compared to 38. I would call that a long ramp.
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Old 03-08-2007, 07:25 PM
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Quote:
Originally Posted by F-BIRD'88
Un I think you got someting confused. A solid cam is Commonly measured for advertized duration at either .015" or .020"
A hyd is commonly measured at either .004" or .006".
they are two different animals and not directly comparable.
If you were to measure a comparable comp solid cam at .020" you'd find that the GM cam is right there relative to the .050" duration. Especialy when you account for the ramp design and lash setting. The actual "running duration" or duration at the running valve lash point is within a few degrees. They are more simular, than different. A comp extreme solid cam will have a little more valve action but needs a more aggressive valve spring to control it to peak rpm. A cam like the GM 30-30 had huge long lash ramps and easy lift off and on the seat. and .030" valve lash. Remember this cam was designed to rev to 7000rpm using the stock valvetrain of the day. The springs were the same "068" stock springs used on every other SBC back then.
if you were to measure a solid cam at .006" (like a hyd is measured) you'd find the duration is huge huge huge on either a comp extreme or GM Ls6 cam. At a lash point (at the valve) equal to .006" lifter rise the valve has not started to move yet. On a BBC with 1.7:1 rockers a .015" lifter rise is equal to a .025" lash point at the valve. A .020" lifter rise is equal to a .034" valve lash point. Assuming there is no valvetrain flex. there is..... trust me.

Comp Cams did not invent the wheel. Or even reinvent it.
Althou some would swear they did.
Yes, I don't know why I wrote 0.006" except that I was very tired when I posted. If you have checked an LS6 cam yourself, then you are more up on the subject than I am. I was comparing a Comp 11-678-5 @0.015" and apparently had some bad information on the LS6 figures. Oh, and the reason I used Comp is because they seem to be the favorite choice in the past few years with their "extreme energy" marketing. I've always been a Crane and Isky man myself. My apologies.
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