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Old 03-06-2007, 05:14 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, 06:54 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, 07:07 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, 07:10 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, 07:12 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, 07:14 PM
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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.
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Old 03-06-2007, 07:17 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, 07:22 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, 07:36 PM
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Quote:
Originally Posted by techinspector1
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.
this cam does not have big long ramps. not like say the "30-30" Z-28 SBC factory cam. I actually measured and ploted the lobe lift curve of mine years ago. The seat duration is 284@.020". The lift is a bit modest but enough.
The guides last a lot longer with modest lift.
if you compare other street cams from comp you'll see that it hangs right in there. A comparable cam like the Comp XE 282s will make a little more power, but not much.
the exact same lobe design was used on the 71-72 350-330hp Z-28/LT-1 cam on the intake lobe.
years ago I had a nice 68 chevelle that I built a 454 using the Ls6 cam in it. ran like a champ but was not a pain to drive at all. Later I changed to a more radical crane solid which did make a little more power up stairs but the low end torque and driveability wa not there. The car was no longer just fun to drive. I put the LS-6 cam back in.
The only street race I ever lost with that car was against a very nice "tweeked" 1970 455 stage 1 Buick GS.
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Old 03-06-2007, 07:41 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 07:49 PM.
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Old 03-06-2007, 07:57 PM
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if I was going to pick a cam for your motor from the Isky catalog I would go with the Z-66 or Z-45. They are very simular to the factory Ls6 cam but have a tighter 108LSA. Will have a little rougher idle than the factory 114LSA cam. Would have a little more mid and upper rpm power when uncapped but not a lot.
The tighter LSA adds some torque at the expense of everday drivability at part throttle. Either would be a nice cam for your purpose thou. I like the Z-45 cam.

I would not go with the bigger Z-33 cam unless I was more interested in drag racing it with open headers and a 11" 3500 stall converter.
You won't like it with the stock GM 12" (2500stall) converter.
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Old 03-06-2007, 08:04 PM
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Some how I assumed you were asking about a cam for a BB chev.
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Old 03-06-2007, 08:13 PM
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For a chryslerBB RB motor its very hard to beat the Mopar "Purple Shaft" cams. These cams take full advantage of the large .904" chrysler lifter. One of the milder mechanical purple shaft cams is just right. I believe there is one that is 238" @.050 and .528" lift or something like that. That cam would be just right for your 400 RB chrysler.
here it is... its Mopar pn P4120659 284-284 adv dur 241-241deg@.050" .528" .528" lift. 112LSA HOT lash is .028"-.032". I would not go bigger without a high stall. use a 750cfm carb on a Edelbrock Performer RPM for RB motors.
The old factory 440 tripower intake and carbs would be sweet too. Very sweet.
This cam is very very simular to the GM LS-6 BB chev cam
"Degree" it in when you install it, and if not already slightly advanced in the motor, advance it 4deg from "straight up".
intake lobe on 108 exhaust on 116.
It's going to be sweet.

Note: the valve lash recomendation is a HOT lash setting. make sure the motor is good and hot when ya set the lash.
Warm the motor right up hot and shut it off. Remove one valve cover and set all the valves on that cylinder bank. Reinstall the valve cover and warm it up again. Repeat for the other cylinder bank.
if the lifter volume is too much for ya at idle, try tightening the HOT lash setting by .004" to .006". Tighter lash (within reason) = quieter valvetrain.

Last edited by F-BIRD'88; 03-06-2007 at 09:04 PM.
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Old 03-06-2007, 09:01 PM
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Thanks guys. That's exactly the information I need.
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Old 03-06-2007, 09:22 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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