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Old 07-25-2008, 10:37 AM
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Isky 264 mega cam/experience ?

Hi can anybody tell me how the Isky 264 mega cam works and sounds ?
I was planning to install one in my 1980 Corvette, want it to be a little more aggressive.
Thanks. Kristofer.

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Old 07-25-2008, 01:53 PM
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Quote:
Originally Posted by Icelander
Hi can anybody tell me how the Isky 264 mega cam works and sounds ?
I was planning to install one in my 1980 Corvette, want it to be a little more aggressive.
Thanks. Kristofer.
Nice warmed street cam with a light but noticable lope. An 80 'vette is hurting for compression already, this cam would like more to the tune of 9 to 9.5 to one. This will reward you with a better lower end response, better mileage, and a stronger sounding lope.

Bogie
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Old 07-25-2008, 02:02 PM
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I'd talk to the 3 big cam companies.

You can add a little duration, and tighten up the lobe separation angle to
get the idle you like to hear
and when it gets up to 1200 the torque curve and throttle response of the tighter LSA will kick in and be fun to drive.
In moderation this works well with the slightly lower compression.
watch those power brakes might need a canister, but worth the trouble to sound good.
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Old 07-25-2008, 02:03 PM
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that cam is quite a bit bigger than stock.

specs are...
214 degrees at 0.050"
0.450" lift
108 LSA.

Isky says to use a 3.23 to 3.70 gear and 9 to 10.5:1 cr.

What is a 1980 vetter cr and gear ratio? 8.25:1cr and a 2.73 gear?

That would be a good cam if you plan to add some compression and some gears

I would use a smaller cam with more duration on the exhaust side as compared to the intake. An Edelbrock performer cam (204/214 with 112 lsa) would be a nice upgrade on a otherwise stock setup. If you can find that same cam (204/214) ground with 108 lsa it would be even better.

Do not try to mix a lopy idle with low compression and highway gears.
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Old 07-25-2008, 06:53 PM
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Thanks guys, i do have a set of edelbrock performer heads with 64 cc chamber, Edelbrock performer intake and new headers and i believe it has a 3.70 gear ratio, and a 2200-2400 stall converter. You think it might work ?
Thanks for your time guys. Kristofer
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Old 07-26-2008, 12:13 PM
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Quote:
Originally Posted by Icelander
Thanks guys, i do have a set of edelbrock performer heads with 64 cc chamber, Edelbrock performer intake and new headers and i believe it has a 3.70 gear ratio, and a 2200-2400 stall converter. You think it might work ?
Thanks for your time guys. Kristofer
That combination should work very well.

Bogie
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Old 07-27-2008, 07:54 AM
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sounds great. You could use a little more cam if you would like (if you are sure about the 3.70 gear)

what are the engine rpms at 60 mph and how tall are your tires???

are you using a th350 or th400??
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Old 07-28-2008, 06:37 PM
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Hi, the engine rpm at 60 mph is close to 2800. The tire size is the original
255-60-15. and im using a th 350 transmission. Thanks.
Kristofer.
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Old 07-29-2008, 07:55 AM
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assuming the tach and speedo are right and the tires are 27 inch tall. I think you have a 3.55 or 3.73 gear (depending on converter slip).

With no slip at 2750 rpms and 27" tall tires, a 3.55 gear with be at 62.2 mph.

With no slip at 2750 rpms and 27" tall tires, a 3.73 gear with be at 59.2 mph.

So most likely a 3.70 gear (as you were told)

For a better estimate...Do a flat road 80 mph run (to reduce converter slip) and write down rpms. Then measure linear distance of one tire rotation (mark tire and ground with a grease pencil and roll the car for one tire rotation).

Is the speedo correct? Drive about 5 miles down a mile marked road and measure the difference between the odometer and mile markers. For example, if the distance difference is 0.5 miles over a 5 miles distance then the speedo error is 10%.

In any case, you have enough gear and converter for a cam change.
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Old 07-30-2008, 12:46 PM
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"Thanks guys, i do have a set of edelbrock performer heads with 64 cc chamber, Edelbrock performer intake and new headers and i believe it has a 3.70 gear ratio, and a 2200-2400 stall converter. You think it might work ?
Thanks for your time guys. Kristofer"


Dude, pick up some easy compression with a Felpro .015 compressed steel shim gasket and ditch the stock .038/.041, you could pick up atleast 2- tenths of a point of compression with that change, maybe get you a hair under 9:1...then go a 'cam down' on the page of that Isky cataloge... that's what I would do, even with that 108 LSA. A 2200 stall and 3.70 gears... I would be willing to give up bottom end for mid-range just to hook up on the street but to some people a good smokey burnout lights their fire... either way. I think Crane makes something VERY similar in there energizer line... I think you can get the cam/lifter kit from Competition Productsfor $131, which will be cheaper than Isky's price and is just as good. I think the Crane specs are .450/.450 218/218@.050 on 108 LSA
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