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-   -   Isky 264 Mega for this combo (http://www.hotrodders.com/forum/isky-264-mega-combo-229081.html)

GMC boogie 02-02-2013 07:36 AM

Isky 264 Mega for this combo
 
Thinking about this HFT camshaft for a mild 355 in a '72 Chevelle.

Dart ss 165 iron heads with 72cc chambers
6cc flat top pistons
9.3:1 CR
Weiand 8125 dual plane manifold
Quadrajet carb
TH350
2.73 axle ratio
1 5/8 headers with 2 1/4 dual exhaust

The cam specs are 214/214 at .050 264/264 at .007 .450/.450 lift with 1.5 rockers and has a 108 LSA

Obviously not a drag car with the 2.73 axle ratio. The car is just meant to be a nice cruiser with good drivability and low-mid torque.

Cam looks like a good match. Any thoughts?

6sally6 02-02-2013 01:32 PM

Should be a good fit! Compression is high enough....duration is not too big and the "Isky" trademark 108 LSA will give it a good lick at idle. I like it!!
6sally6

ssmonty 02-02-2013 01:46 PM

I've got a 350 with a HE260 cam (212@0.050"), stock convertor, 3.73 rear, performer intake, 600 VS Holley, Tri-Y headers, 200R4 trans.. It pulls 15" vacuum at 650 rpm idle. Runs great from idle to about 5200rpm with good throttle response(3.73 might have something to do with that).
I didn't figure the CR back in the 1980's when it was built, but it was supposed to be around 8.8:1. The heads came from RHS back then and were stock rebuilt cast iron w/76cc chambers with pocket porting/bowl blending(?port cc).
Your cam is just a little bigger, and with 108 lsa vrs the 110 lsa mine has, I'm thinking you may have just a little less low end/idle vacuum.
I'd say it was a good choice except for the rear gear being just a bit too high.JMO
ssmonty

vinniekq2 02-03-2013 12:51 AM

check out those heads before you use them.I think the flow numbers are low

tresi 02-03-2013 02:35 AM

My very first hotrod had a similar combo. It will work ok but it will like a little more gear but it will work until you can afford the gears.

snakebit68 02-03-2013 08:50 AM

isky
 
Cam is a fairly good choice. Rear gears are less then optimal as you know.

BigEd36 02-03-2013 12:00 PM

According to Dart literature the Iron Eagle SS heads exhaust flow is 61.5% of the intake flow, so if using those heads I would use a split pattern cam with a little more on the exhaust side. Consider the Isky 264/270 Mega cam or something like the Howards #112571-12, 269* intake, 279* exhaust, 215*/225*, .455"/.465", 112* LSA 108* ICL, 1200-5500 Good idle, Strong low & mid-range torque & horsepower.

vinniekq2 02-03-2013 01:35 PM

biged36
hey!
thanks for that info. I was not sure the 165 darts flow well or not.

BigEd36 02-03-2013 03:07 PM

Quote:

Originally Posted by vinniekq2 (Post 1642124)
biged36
hey!
thanks for that info. I was not sure the 165 darts flow well or not.


Vinnie, according to the Dart catalog the Iron Eagle SS's flow 221 cfm at .400" lift on the intake, 136 cfm at .400" lift on the exhaust, 232/138 at .500" lift, so intake flow is comparable to GM vortecs, but, like GM vortecs, the exhaust is rather poor in flow compared to the intakes. With an exhaust flow of 61.5% of intake flow a split pattern cam would be very helpful. The 180cc and larger port Iron Eagles have a much better exhaust/intake flow ratio. They're around 70-71%.

1971BB427 02-04-2013 06:58 PM

That's a great cam, and perfect for a cruiser, and should perform well right off idle to probably 5,000 rpm's. Nice to see someone choose a realistic cam that works, and not get all crazy on huge lopey cams to get a certain sound, but no performance.


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