Isky Mega 280 cam - Team Camaro Tech
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post #1 of 24 (permalink) Old Feb 15th, 10, 05:46 PM Thread Starter
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Bill
 
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Isky Mega 280 cam

Has anyone ever used this cam in a 327/300 horse engine? My car has a 4 speed trans and a 3.73 rear gear. The engine has 2.02 heads W/ 64 cc chambers, a Performer manifold with a Holley 650 dp carb, and HEI ignition. How did your car perform with this camshaft? Was your combo close to mine? The car is street driven W/ occassional strip use. Thanks in advance.
Bill
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post #2 of 24 (permalink) Old Feb 15th, 10, 06:03 PM
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Steve
 
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Re: Isky Mega 280 cam

What pistons?

69 Pace Car and 69 Hard top
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post #3 of 24 (permalink) Old Feb 15th, 10, 07:17 PM
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Tom
 
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Smile Re: Isky Mega 280 cam

If your car has double hump heads and that cam is hydraulic, that cam is too big. The comp cams 268h is the maximum cam you will want in that combo.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 TPI transmission, 12-bolt w/Eaton 4.11:1
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post #4 of 24 (permalink) Old Feb 15th, 10, 07:28 PM
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AJ
 
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Re: Isky Mega 280 cam

I run the 286H magnum from comp as listed above in an aluminum headed .040" 327 and love it.
I don't yet have the gearing to make it shine, but it runs very well, has kept up with a cammed ls1 in a '69, wasn't a full out race but it surprised us.
specs are 238 @.050" 286 advertised, .490" with 1.5's, 110lsa
I would suggest either locked out timing, or get the correct vacuum advance can and tune the distributor well or you will have alot of problems, smaller motors respond to cam changes more drastically, especially one that "big" even though it's really not all that big in comparison to others.
My vacuum is around 6" with a dual plane intake, wouldn't suggest a single plane, it was around 3"-4" with a team G and had to slip the clutch alot to get things going, didn't make anything until 3k and would pull to 7k which I thought was too high.
It pulls well from 2,200-2,500 all the way to 6,500 probably because i'm running out of fuel.

I've heard not to run the comp magnum cams with old school heads...
Don't run either unless you have at least 11:1, mine is 10.8:1 and I feel it needs more compression, runs well on pump gas. My dcr is 7.88 if I remember correctly?

The only Mustang I'd ever own is a Fender.

'68 333" Camaro
'14 5.0 Mustang
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post #5 of 24 (permalink) Old Feb 15th, 10, 08:31 PM
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Rich
 
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Re: Isky Mega 280 cam

I ran that cam for a while in my flat top 350 with unported 461 heads,an old 8004 intake and 600 carb.It ran well,but is much rougher then any comparable size cam.I had a 278 HMV crane in that same engine and while the ISKY might have made a small amount more power,it had a much rougher idle.A popular cam at around the same time was the 280 Magnum Comp.The Isky was roughrer then the 280 Magnum which at the time had 112 degre lobe seperation I think(compared to the Isky's 108).I ran the same exact 280 Isky in a 400 with Dart heads and a Victor JR and it made more we then a lot of the larger cammed 400's I was seeing at the track.

So my opnion is that the 280 Isky cam make really good power but ist as driveable as most other cams of it's size.With a 4speed and the amount of gear you have it should be a fun combo,but it wont pull away rom a stop light at idle.
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post #6 of 24 (permalink) Old Feb 15th, 10, 09:47 PM
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Butch
 
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Re: Isky Mega 280 cam

Quote:
Originally Posted by RichSchmidt View Post
I ran that cam for a while in my flat top 350 with unported 461 heads,an old 8004 intake and 600 carb.It ran well,but is much rougher then any comparable size cam.I had a 278 HMV crane in that same engine and while the ISKY might have made a small amount more power,it had a much rougher idle.A popular cam at around the same time was the 280 Magnum Comp.The Isky was roughrer then the 280 Magnum which at the time had 112 degre lobe seperation I think(compared to the Isky's 108).I ran the same exact 280 Isky in a 400 with Dart heads and a Victor JR and it made more we then a lot of the larger cammed 400's I was seeing at the track.

So my opnion is that the 280 Isky cam make really good power but ist as driveable as most other cams of it's size.With a 4speed and the amount of gear you have it should be a fun combo,but it wont pull away rom a stop light at idle.
Both the Isky and Comp and Crane 280 are good cams

The 108 lobe center will make the package better all the way around as long as the seat duration is not crazy for the application.

I would run 10:1 and run the Isky 280, Have fun
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post #7 of 24 (permalink) Old Feb 16th, 10, 07:07 AM
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greg
 
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Re: Isky Mega 280 cam

Too much cam for your combo and your low speed manners will not be fun. I would look at the Isky 264 Mega cam with 214 dur. .450 lift 108 lsa, Comp. 268HE, or if you want a big lope at idle then the old Crane 274H06, 218 duration, .450 lift, 106 lsa will give you lots of low and mid range power. competitionproducts.com sell the Elgin copy of the 274 cam under part #E1785PM for $100 including lifters. Nice street cam.
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post #8 of 24 (permalink) Old Feb 16th, 10, 10:39 AM Thread Starter
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Bill
 
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Re: Isky Mega 280 cam

The shortblock is stock with the original GM 4 valve relief cast flat top pistons. One thing I do not want is a cam that will make the car impossible to drive. In the past I have successfully used the old GM # 151 in a similar engine. The engine ran good, but I was thinking of a cam a step or two up from the L-79. I already have the 350 horse cam and wonder if I should use it, what do all of you think? I do not yet have the 280 cam.
Bill
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post #9 of 24 (permalink) Old Feb 16th, 10, 12:13 PM
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Tom
 
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Smile Re: Isky Mega 280 cam

I would use that L79 cam. It probably will perform better then the 280 in THAT engine. The GM engineer's put the largest cams they could into those engines running those heads. If you want solid then use the 30-30 or the off-road cam, and boost up your compression ! It is true that cam technology has improved in the last 40 years, but so has head technology. It is not good to stick a new modern designed cam into an engine with the old double hump heads. It is like installing Windows 7 on an old P3 computer. It might work, but not very well. The intake ports are just too small on those old heads. If you spend a lot of money or time on those heads, they MIGHT get the job done. The port velocity created by these new cam's is way too much for those small ports !

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 TPI transmission, 12-bolt w/Eaton 4.11:1

Last edited by TJS69; Feb 16th, 10 at 01:22 PM.
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post #10 of 24 (permalink) Old Feb 16th, 10, 02:30 PM
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greg
 
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Re: Isky Mega 280 cam

The 114 lsa of the 350 cam makes the intake close 41*ABDC compared to the 274H06 cam at 31* ABDC, not the best for building cylinder pressure. The comp 274H06 will give you better low and midrange power and rev. to 6200 with good springs. If you need to run the 350 cam then at least advance it 4* when you install it. Even the Comp 268, and264 Mega cams will out perform the 350 cam.
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post #11 of 24 (permalink) Old Feb 16th, 10, 04:10 PM
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John
 
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Re: Isky Mega 280 cam

Quote:
Originally Posted by docwilcar View Post
The 114 lsa of the 350 cam makes the intake close 41*ABDC compared to the 274H06 cam at 31* ABDC, not the best for building cylinder pressure.
True, but that late-closing intake event is what makes the "151" cam work at 11:1 compression on pump premium without detonation.

JohnZ
CRG
'69 Z/28 Fathom Green
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post #12 of 24 (permalink) Old Feb 17th, 10, 03:42 PM
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greg
 
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Re: Isky Mega 280 cam

Good point, I guess I was assuming his 327 c.r. was 10 or less. At 11 c.r. the short duration cams would be a big problem as you suggest. I saw an old Hot Rod article on a 350 motor at 11.3 c.r. using a Crane energizer 222-222-.467 lift 112 lsa and it made 377 hp at 5500 rpm using 492 64 cc heads. Not sure how that would translate to a 327 but the engine builder was pretty impressed with that cam.
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post #13 of 24 (permalink) Old Feb 18th, 10, 11:45 PM
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Anthony
 
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Re: Isky Mega 280 cam

My first 327 was a used one from a 67 camaro with 520 casting power pac heads. I dropped the 280 mega in there using my pg with a vega converter and 3.08 gears. That thing had tons of power. Ran mid 15`s with a hole in the piston lol. with a better tranny and better gears and heads I probably would have been happy with that set up for a long time. I know a guy who had a 67 camaro with a 11:1 327 with the 280 mega and ported 461 heads that ran 11.80`s. Not that same combo as above but thought I`d mention it for referance
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post #14 of 24 (permalink) Old Feb 19th, 10, 12:08 AM
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Butch
 
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Re: Isky Mega 280 cam

Quote:
Originally Posted by sschevellefan View Post
My first 327 was a used one from a 67 camaro with 520 casting power pac heads. I dropped the 280 mega in there using my pg with a vega converter and 3.08 gears. That thing had tons of power. Ran mid 15`s with a hole in the piston lol. with a better tranny and better gears and heads I probably would have been happy with that set up for a long time. I know a guy who had a 67 camaro with a 11:1 327 with the 280 mega and ported 461 heads that ran 11.80`s. Not that same combo as above but thought I`d mention it for referance
Our user names look funny here lol
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post #15 of 24 (permalink) Old Feb 19th, 10, 12:10 AM
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Anthony
 
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Re: Isky Mega 280 cam

yeah. I don`t post here much but there are alot more sbc guys here than on the chevelle page. alot of them are 327`s too.
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